Shop by Brand: Ronstan

Series 40 Ball Bearing Orbit Block™ - Single - Becket - Swivel Head

Core Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.

Lightweight
Kilogram for kilogram of working load, BB Orbit Blocks™ are the world's lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimises the mass of the inactive return race and hub.

Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible.

Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement. This gives a 30% weight saving advantage over the nearest competitor. Other brands just link together their single blocks. This results in unnecessary double cheeks between each sheave, held together by a heavy steel channel across the top of the block.

Highest Working Load In Its Class
The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximises load performance. The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range.

The floating sheave and bearing system is supported by a fiber-reinforced load frame. The design was computer modelled to be stress optimised.

Features:

• Ultra Lightweight
  
• Low friction 2-stage Orbital ball bearing system
  
• Highest working load in its class
  
• Low profile and compact
  
• High performance cleating
  
• Swivel shackle head for unlimited block rotation
  
• Stainless steel shackle head for ultimate durability and compatibility with harsh fixing points
  
• Ultra low profile integrated becket

Applications:

• Spinnaker sheets on dinghies, sportsboats and small keel boats to 5M(16')
  
• Halyard, vang and backstay applications on boats to 8M(26')
  
• Control line applications on larger yachts

Materials:

• Ball Bearings - High compression stregnth carbon black Acetal
  
• Stage 2 Bearing - Glass fiber reinforced, MoS2 impregnated Nylon
  
• Frame/Cheeks - Toughened, glass fiber reinforced Nylon
  
• Sheave - Carbon fiber reinforced, PTFE impreganated Nylon
  
• Head fitting: Grade 316 stainless steel

Specifications:
Sheave Ø: 40mm(1-9/16")
M.W.L.: 325kg(715lbs)
B. L.: 650kg(1,430lbs)
Weight: 44g(1.6oz)

Series 40 Ball Bearing Orbit Block - Single - Stand-Up Swivel Head

Features:

• Ultra Lightweight
• Low friction 2-stage Orbital ball bearing system
• Highest working load in its class
• Low profile and compact
• High performance cleating
• Swivel shackle head for unlimited block rotation -grade 316 stainless steel.
• Stainless steel shackle head for ultimate durability with harsh fixing points.

Lightweight

Kilogram for kilogram of working load, BB and RT Orbit Blocks™ are the world’s lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimizes the mass of the inactive return race and hub.

Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible.

Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement. This gives a 30% weight saving advantage over the nearest competitor. Other brands just link together their single blocks. This results in unnecessary double cheeks between each sheave, held together by a heavy steel channel across the top of the block.

 Highest Working Load In It's Class

The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximizes load performance. The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range.

The floating sheave and bearing system is supported by a fiber-reinforced load frame. The design was computer modeled to be stress optimized.

Recommended fasteners - 2 x 4mm (5/32") countersunk head screws

Applications:

• Mainsheet systems on spinnaker sheet on dinghies to 5m (16ft)
• Spinnaker sheets on dinghies, sportsboats and small keel boats to 5m (16ft)
• Halyard, vang and backstay applications on boats to 8m (26ft)
• Control line applications on larger yachts

Materials:

• Ball Bearings - High compression strength carbon black Acetal.
• Stage 2 Bearing - Glass fiber reinforced, MoS2 impregnated Nylon
• Frame/Cheeks - Toughened, glass fiber reinforced Nylon
• Sheave - Carbon fiber reinforced, PTFE impregnated Nylon

Series 40 High Load Block - Single

Features:

• Exceptionally high working loads
• Lightweight
• Cheek cut-outs for easy bearing maintenance
• Suitable for both rope or wire
• Captive Lock™ universal head
• Slotted pin shackle eliminates fouled lines

Ideal for high load applications. Wear resistant sheave material, in lightweight, self lubricating polymer, is suitable for use with rope or wire.Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required

Applications:

• Halyards
• Backstays
• Vang
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)

Materials:

• Nylatron® sheave
• Grade 316 stainless steel load strap and head fitting
• Impact and U.V. resistant, fiber reinforced Nylon cheeks

Series 40 High Load Exit Box for Single Rope or Wire

Plain bearing sheaves are ideal for halyards and other applications where high static loads are likely to be encountered

Applications:

• Ideal applications where lines (rope or wire) need to be led through decks, bulkheads or spars minimizing friction and chafing

Materials:

• Nylatron®l sheave
  
• Grade 316 Stainless Steel cheeks

Specifications:
Sheave Ø: 40.0mm(1-9/16")
Max. Rope Ø:10.0mm(3/8")
Max. Cable Ø: 5.0mm(3/16")
B.L.: 1,000kg(2,200lbs)

Series 45 Core Block - Single/Swivel Haylard

Core Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.

Universal Bearing

• Dynamic and high static load performance
• The Ronstan Universal Bearing incorporates our proven 2-stage bearing system
• Stage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction
• Stage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance
• Additionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn’t perfect. Particularly important for cheek blocks

Alloy Cheek Plates
Block cheeks are manufactured from the highest quality alloy for maximum strength. Material optimization and the cut-away design minimizes weight and allows easy fresh water rinsing of salt and debris from the bearings.  Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimizing rope wear.

Features:

• High dynamic and static load capacity
• Efficient 2-stage bearing system
• Ball bearings to counteract side thrust loads
• Class leading performance and sleek, contemporary styling
• Durable aluminium alloy cheek plates
• Central hub hole can be used as a becket take-off or tie-up point
• Incorporates a low profile swivel head fork
• Features a removable screw pin for attachment to padeyes
• Suitable for 12mm (1/2") diam. mast collar post

Applications:

• Ideal for mainsheet, halyard and spinnaker sheet applications on boats to 10M (33')
• Various control line applications on larger yachts
• Alloy sheave models are available for use with wire

Materials:

• Sheave: U.V. stabilised Acetal
• Cheek body: Aluminium Alloy
• Ball Bearings: High compression strength carbon black Acetal
• Shackle, head post & hub: Grade 316 stainless steel

Series 45 Stand-Up Core Block - Swiveling

Core Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.

Universal Bearing

• Dynamic and high static load performance
• The Ronstan Universal Bearing incorporates our proven 2-stage bearing system
• Stage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction
• Stage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance
• Additionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn’t perfect. Particularly important for cheek blocks

Alloy Cheek Plates
Block cheeks are manufactured from the highest quality alloy for maximum strength. Material optimization and the cut-away design minimizes weight and allows easy fresh water rinsing of salt and debris from the bearings.  Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimizing rope wear.

Features:

• High dynamic and static load capacity
• Efficient 2-stage bearing system
• Ball bearings to counteract side thrust loads
• Class leading performance and sleek, contemporary styling
• Durable aluminium alloy cheek plates
• Central hub hole can be used as a becket take-off or tie-up point
• Features a strong cast padeye base with a swivel head post to allow full rotation and articulation

Applications:

• Ideal for mainsheet, halyard and spinnaker sheet applications on boats to 10M (33')
• Various control line applications on larger yachts
• Alloy sheave models are available for use with wire

Materials:

• Sheave: U.V. stabilised Acetal
• Cheek body: Aluminium Alloy
• Ball Bearings: High compression strength carbon black Acetal
• Shackle, head post & hub: Grade 316 stainless steel

Series 50 All Purpose Block - Double

Features:

• Exceptionally high working loads
• Low maintenance, long service life
• Self-lubricating Acetal polymer sheave ensures low friction and extreme durability
• Slotted pin shackle eliminates fouled lines
• Lockable swivelling head post

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Head can be locked at 0° or 90° by engaging the grub screw in either the 0 or 90 degree position.

Applications:

• Mainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)
• S60 - on boats up to 12m (40ft)

Materials:

• Grade 316 stainless steel load strap
• Impact and UV resistant, fiber reinforced Nylon cheeks

Series 50 All Purpose Block - Fiddle - Becket

Features:

• Exceptionally high working loads
• Low maintenance, long service life
• Self-lubricating Acetal polymer sheave ensures low friction and extreme durability
• Captive Lock™ universal head
• Slotted pin shackle eliminates fouled lines
• Snap fit removable becket pin
• Spare Parts - RF51010 Replacement Becket Pin, RF150 Shackle

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required. Becket pin is removable so line can be spliced prior to fitting and is ingeniously locked into position without the use of a clevis pin, split ring or tools

Applications:

• Mainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)
• S60 - on boats up to 12m (40ft)
• Ideal for fine-tune mainsheet tackles, cunninghams, backstays and other control line purchase systems.

Materials:

• Grade 316 stainless steel load strap
• Impact and UV resistant, fiber reinforced Nylon cheeks

Series 50 All Purpose Block - Single - Universal Head

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing. Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required

Features:

• Exceptionally high working loads
  
• Low maintenance, long service life
  
• Self lubricating sheave
  
• Captive Lock™ universal head
  
• Slotted pin shackle eliminates fouled lines

Applications:
Mainsheet and halyard applications, vang and spinnaker control lines on boats to 10M(33')

Materials:

• Nylatron® sheave
  
• Grade 316 stainless steel load strap and head fitting
  
• Impact and U.V. resistant, fiber reinforced Nylon cheeks

Specifications:
Sheave Ø: 50mm(2")
Max. Rope Ø: 12mm(1/2")
Max. Pin Ø: 5mm(3/16")
M.W.L.: 750kg(1,650lbs)
B. L.: 1,500kg(3,310lbs)
Weight: 118g(4.1oz)

Series 50 All Purpose Block - Single Upright Lead

Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Ideal for high load applications. Wear resistant sheave material, in lightweight, self lubricating polymer, is suitable for use with rope or wire

Applications:

• Typically used for halyards at the mast base.

Materials:

• UV stabilized acetal sheave
• Grade 316 stainless steel load housing

Series 50 All Purpose Cheek Block - Single

Features:

• Exceptionally high working loads
• Low maintenance, long service life
• Self-lubricating Acetal polymer sheave ensures low friction and extreme durability

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Can be mounted on masts and booms using the curved surface adapter. Can be stacked to create a double version, but no more than 60% of the rated working load should be applied to the upper sheave. Mount with 3mm x 6mm (1/4") fasteners (not supplied).

Applications:

• Mainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)
• S60 - on boats up to 12m (40ft)

Materials:

• Alloy cheeks

Series 50 All Purpose Single Loop Top - Becket

Features:

• Exceptionally high working loads
• Low maintenance, long service life
• Self-lubricating Acetal polymer sheave ensures low friction and extreme durability
• Snap fit removable becket pin
• Spare Parts - RF51010 Replacement Becket Pin

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Becket pin is removable so line can be spliced prior to fitting and is ingeniously locked into position without the use of a clevis pin, split ring or tools.

Applications:

• Mainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)
• S60 - on boats up to 12m (40ft)

Materials:

• Grade 316 stainless steel load strap
• Impact and UV resistant, fiber reinforced Nylon cheeks

Series 50 High Load Block - Single - Universal Head

Ideal for high load applications. Wear resistant sheave material, in lightweight, self lubricating polymer, is suitable for use with rope or wire.Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required.

Features:

• Exceptionally high working loads
  
• Lightweight
  
• Cheek cut-outs for easy bearing maintenance
  
• Suitable for both rope or wire
  
• Captive Lock™ universal head
  
• Slotted pin shackle eliminates fouled lines

Applications:

• Mainsheet
  
• Spinnaker sheets
  
• Halyards and other primary applications on boats up to 10M(33')

Materials:

• Nylatron® sheave
  
• Grade 316 stainless steel load strap and head fitting
  
• Impact and U.V. resistant, fiber reinforced Nylon cheeks

Specifications:
Sheave Ø: 50mm(2")
Max. Rope Ø: 12mm(1/2")
Max. Cable Ø:5mm(3/16")
Max. Pin Ø: 5mm(3/16")
M.W.L.: 800kg(1,760lbs)
B. L.: 1,500kg(3,310lbs)
Weight: 117g(4.1oz)

Series 55 Ball Bearing Orbit Block™ - Single - Becket - Swivel Head

Lightweight
Kilogram for kilogram of working load, BB and RT Orbit Blocks™ are the world's lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimises the mass of the inactive return race and hub.

Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible.

Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement. This gives a 30% weight saving advantage over the nearest competitor. Other brands just link together their single blocks. This results in unnecessary double cheeks between each sheave, held together by a heavy steel channel across the top of the block.

Highest Working Load In Its Class
The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximises load performance. The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range.

The floating sheave and bearing system is supported by a fiber-reinforced load frame. The design was computer modelled to be stress optimised. The Dyneema® Link is produced from FSE Robline SK75 fiber, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point.

Features:

• Ultra Lightweight
  
• Low friction 2-stage Orbital ball bearing system
  
• Highest working load in its class
  
• Low profile and compact
  
• High performance cleating
  
• Swivel shackle head for unlimited block rotation
  
• Stainless steel shackle head for ultimate durability and compatibility with harsh fixing points
  
• Ultra low profile integrated becket

Applications:

• Mainsheet systems on dinghies, sportsboats and small keelboats to 9M(30')
  
• Spinnaker sheets on dinghies, sportsboats and small keel boats to 9M(30')
  
• Halyard, Vang and Backstay application on boats to 8M(26')
  
• Control line applications on larger yachts
  
• Ideal use for mainsheet systems and spinnaker sheets on dinghies, sportsboats and small keel boats to 9M(30')
  
• Also ideal with halyard, vang and backstay applications on boats to 8M(26')
  
• Spinnaker sheets on sportsboats and small keel boats (lateral lead blocks)
  
• Control line applications on larger yachts

Materials:

• Ball bearings - High compression strength carbon black Acetal
  
• Stage 2 bearing - Carbon fiber reinforced, PTFE impregnated Nylon
  
• Frame/Cheeks - Toughened, glass fiber reinforced Nylon
  
• Rope Link: UV stabilized, multi-strand impregmented SK75 Dyneema®
  
• Sheave: Carbon fiber reinforced, PTFE impregnated Nylon
  
• Head fitting: Grade 316 stainless steel.

Specifications:
Sheave Ø: 55mm(2-5/32")
Max. Rope Ø: 10mm(3/8")
M.W.L.: 500kg(1,100lbs)
B. L.: 1,000kg(2,200lbs)
Weight: 88g(3.1oz)

Series 55 Ratchet Mount Orbit Block - Cheek Anti-Clockwise Rotation

Features:

• Up to 20:1 holding power
• Smooth easing of sheets
• High performance cleating
• Automatic & manual ratchet block

Automatic ratchet block

Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.

* Selected Series 55 models.

 Awesome ratchet block holding power

Quite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitor. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designs have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimize rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load. 

Simple and secure attachment

The Dyneema® Link is easily fitted and is retained securely by a molded retainer clip. The flexible link can be left with one end attached to the block when fitting - no more lost shackle pins. The system is compatible with Dyneema®/Spectra® strops, webbing and caron connection points - much more so than steel loop tops or shackles. In auto mode, the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. In manual mode, the sheave cross-hole geometry eliminates the 'shuddering' run-out that you can expect from traditional v-groove ratchet blocks.

Materials:

• Sheave: Anodized Aluminium
• Ball Bearings: High compression strength carbon black Acetal
• Frame/Cheeks: Toughened, glass fiber reinforced Nylon
• Rope Link: UV stabilized, multi-strand impregnated SK75 Dyneema®

Series 55 Ratchet Mount Orbit Block - Single Cleat Swivel - Auto

Features:

• Up to 20:1 holding power
• Smooth easing of sheets
• High performance cleating

Automatic Ratchet Block

Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.

* Selected Series 55 models.

 Awesome ratchet block holding power

Quite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitor. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designs have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimize rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load. 

Materials:

• Sheave: Anodized Aluminium
• Ball Bearings: High compression strength carbon black Acetal
• Frame/Cheeks: Toughened, glass fiber reinforced Nylon
• Rope Link: UV stabilized, multi-strand impregnated SK75 Dyneema®

Series 55 Ratchet Orbit Block™ - Single - Swivel Head - Auto & Manual

Automatic Ratchet Block
Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.


Awesome Ratchet Block Holding Power
Quite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitior. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designes have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimise rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.

Features:

• Up to 20:1 holding power
• Smooth easing of sheets
• High performance cleating
• Swivel shackle head for unlimited block rotation.
• Stainless steel shackle head for ultimate durability and compatibility with harsh fixing points.
• Automatic & manual ratchet block

Applications:

• Mainsheet systems and spinnaker sheets on dinghies, sportsboats and small keel boats to 8M(26')
• Halyard, vang and backstay applications on boats to 8M(26')
• Spinnaker sheets on sportsboats and small keel boats (lateral lead blocks)

Materials:

• Sheave: Hard anodised Aluminium
• Ball Bearings: High compression strength carbon black Aceetal
• Frame/Cheeks: Toughened, glass fiber reinforced Nylon
• Rope Link: UV stabilized, multi-strand impregnated SK75 Dyneema®
• Head fitting: grade 316 stainless steel

Specifications:
Sheave Ø: 55mm(2")
Max. Rope Ø: 10mm(1/2")
M.W.L.: 250kg(550lbs)
B. L.: 650kg(1,430lbs)
Weight: 82g(2.9oz)

Series 60 Core Block™ - Single

Core Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.

Universal Bearing
Dynamic and high static load performance

The Ronstan Universal Bearing incorporates our proven 2-stage bearing system

Stage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction.

Stage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.

Additionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.

Alloy Cheek Plates
Block cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings. Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.

Universal head
The head assembly incorporates a brass bearing washer to provide smooth 360™ rotation of the post and shackle. A set screw arrangement allows the head to be locked at 0™ or 90™.

Shackles are high quality forged grade 316 stainless steel.

Features:

• Class leading performance and sleek, contemporary styling
  
• Excellent dynamic and high static load performance
  
• Less than half the friction of the nearest competitor
  
• Universal head with full 3-axis articulation
  
• Head posts can be locked at 0 or 90 degrees, by using a 2.5mm Hex/Allen Key
  
• Central hub hole can be used as a becket take-off or tie-up point

Applications:

• Ideal for mainsheet, halyard and spinnaker sheet applications on boats to 12M (40')
  
• Various control line applications on larger yachts

Materials:

• Sheave: U.V. stabilized Acetal
  
• Cheek body: Aluminium Alloy
  
• Ball Bearings: High compression strength carbon black Acetal
  
• Shackle, head post & hub: Grade 316 stainless steel

Specifications:
Sheave Ø: 60mm(2-3/8")
Max. Rope Ø: 12mm(1/2")
Pin Ø: 6mm(1/4")
M.W.L.: 1,000kg(2,200lbs)
B. L.: 2,000kg(4,410lbs)
Weight: 235g(8.3oz)

Series 60 Ultimate Ratchet - Single

The extruded hole design, in conjunction with the groove profile of the sheave, provides a more powerful grip than conventional designs - up to 20:1 holding power. Unrivaled low weight is achieved by the use of a Torlon® ratchet pawl, high grade machined alloy sheave and black Acetal hubs and bearings. On-Off switching knob is fitted to both sides of the swivel blocks (one can be removed if desired). Ratchet blocks can be disassembled for servicing or customization.

Features:

• Unrivalled 20:1 holding power
• Dual sided On-Off switch
• Ability to operate On/Off switch under load
• Low friction ball bearing system
• Lightweight
• Cheek cut-outs for easy bearing maintenance

Applications:

• Mainsheet on powerful dinghies and skiffs
• Series 60 mainsheet systems on sports boats using RF7 mainsheet swivel units
• Control line applications on larger yachts
• Spinnaker sheets on sports boats and small keel boats (lateral lead blocks)

Materials:

• Carbon black Acetal ball bearings
• Anodised aluminium sheave and cheek plates
• Torlon® ratchet pawl
• Grade 316 stainless steel forged shackle

Specifications:

• Sheave Ø: 2-3/8"
• Max. Rope Ø: 3/8"
• Pin Ø: 3/16"
• M.W.L.: 550lb
• B. L.: 3020lb
• Weight: 5.3oz

Series 75 Core Block™ - Single - Aluminum Rope/Wire Sheave

Core Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.

Universal Bearing
Dynamic and high static load performance

The Ronstan Universal Bearing incorporates our proven 2-stage bearing system

Stage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction.

Stage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.

Additionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn't perfect. Particularly important for cheek blocks.

Alloy Cheek Plates
Block cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings. Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.

Universal head
The head assembly incorporates a brass bearing washer to provide smooth 360™ rotation of the post and shackle. A set screw arrangement allows the head to be locked at 0™ or 90™.

Shackles are high quality forged grade 316 stainless steel.

Features:

• Class leading performance and sleek, contemporary styling
  
• Excellent dynamic and high static load performance
  
• Less than half the friction of the nearest competitor
  
• Universal head with full 3-axis articulation
  
• Head posts can be locked at 0 or 90 degrees, by using a 2.5mm Hex/Allen Key
  
• Central hub hole can be used as a becket take-off or tie-up point
  
• Durable alloy Rope/Wire sheave

Applications:

• Ideal for mainsheet, halyard and spinnaker sheet applications on boats to 14M (46')
  
• Various control line applications on larger yachts
  
• Aluminium sheave which has a deep groove profile specifically made for use with wire

Materials:

• Sheave: U.V. stabilized Acetal
  
• Cheek body: Aluminium Alloy
  
• Ball Bearings: High compression strength carbon black Acetal
  
• Shackle, head post & hub: Grade 316 stainless steel

Specifications:
Sheave Ø: 75mm(3")
Max. Rope Ø: 14mm(9/16")
Max. Cable Ø: 8mm(5/16")
Pin Ø: 8mm(5/16")
M.W.L.: 1,500kg(3,300lbs)
B. L.: 3,000kg(6,600lbs)
Weight: 432g(15.3oz)

Shock - 3/16" Line - 1/4" Webbing - Grey - Pair

The Sheaveless Black

The obvious choice for those kitesurfers, paragliders, control line deflections and purchase systems that require a lightweight high load capacity block.

Ultimate durability

With no moving parts SHOCKS provide ultimate durability and are maintenance free. They are ideal where sand and grit would compromise a bearing system or where regular flushing out isn?t possible. Their gentle 3-dimensional geometry is kind on lines, but is strong enough to cope with poor leads.

Soft attachment specialists

SHOCKS are designed primarily for 'soft attachment'; spliced to a line end or lashed in place. The elongated attachment aperture is also ideal for webbing attachment, ensuring the intended orientation is maintained.

Virtually limitless applications

The applications for SHOCKS are virtually limitless, including numerous high performance dinghy and small sailboat rigging applications including tweakers, vangs, trapezes, cunninghams, barber haulers and kite bridles. They are also handy on larger boats for uses such as lazy jacks, sail covers, tie-downs, ladder and motor hoists.

Hidden performance

At a mere 2.5g (0.1 oz), SHOCKS are outstanding performers in the strength and weight stakes. The clever design and exacting finishing also provide excellent free running at moderate changes of angle. Small & hi-tech line specialists SHOCKS accept lines from 1.4mm (1/16") up to 8mm (5/16") and function just as well with hi-tech uncovered braids as with traditional double braids.

Features:

• Performance & versatility
• Ultra lightweight
  
• Ultra compact
• Durable
• Color coded
• Impact resistant
• Small line optimised
• High load capacity
  
• Poor alignment tolerant
• Soft attachment compatible
  
• Grit & salt resistant

Applications:

Unlimited uses, including kitesurfing, paragliders, sports kites, power kites, stunt kites, depower kites, traction kites, for deflection or purchase system on control lines

Materials:

Anodized Aluminum

Specifications:

Rope Ø:1.4mm-5mm(1/16" - 3/16")

Height:8.5mm(5/16")

Width: 14.9mm(9/16")

Length:22.9mm(7/8")

M.W.L.:175kg(385lbs)

B. L.:350kg(770lbs)

Weight:2.5g(0.01oz)

Shock - 3/16" Line - 1/4" Webbing - Red - Pair

The Sheaveless Black

The obvious choice for those kitesurfers, paragliders, control line deflections and purchase systems that require a lightweight high load capacity block.

Ultimate durability

With no moving parts SHOCKS provide ultimate durability and are maintenance free. They are ideal where sand and grit would compromise a bearing system or where regular flushing out isn?t possible. Their gentle 3-dimensional geometry is kind on lines, but is strong enough to cope with poor leads.

Soft attachment specialists

SHOCKS are designed primarily for 'soft attachment'; spliced to a line end or lashed in place. The elongated attachment aperture is also ideal for webbing attachment, ensuring the intended orientation is maintained.

Virtually limitless applications

The applications for SHOCKS are virtually limitless, including numerous high performance dinghy and small sailboat rigging applications including tweakers, vangs, trapezes, cunninghams, barber haulers and kite bridles. They are also handy on larger boats for uses such as lazy jacks, sail covers, tie-downs, ladder and motor hoists.

Hidden performance

At a mere 2.5g (0.1 oz), SHOCKS are outstanding performers in the strength and weight stakes. The clever design and exacting finishing also provide excellent free running at moderate changes of angle. Small & hi-tech line specialists SHOCKS accept lines from 1.4mm (1/16") up to 8mm (5/16") and function just as well with hi-tech uncovered braids as with traditional double braids.

Features:

• Performance & versatility
• Ultra lightweight
  
• Ultra compact
• Durable
• Color coded
• Impact resistant
• Small line optimised
• High load capacity
  
• Poor alignment tolerant
• Soft attachment compatible
  
• Grit & salt resistant

Applications:

Unlimited uses, including kitesurfing, paragliders, sports kites, power kites, stunt kites, depower kites, traction kites, for deflection or purchase system on control lines

Materials:

Anodized Aluminum

Specifications:

Rope Ø:1.4mm-5mm(1/16" - 3/16")

Height:8.5mm(5/16")

Width: 14.9mm(9/16")

Length:22.9mm(7/8")

M.W.L.:175kg(385lbs)

B. L.:350kg(770lbs)

Weight:2.5g(0.01oz)

Sister Clip - Stainless Steel - Large

Effective means of quickly attaching and detaching ropes

58.0mm(2-1/4") Length

Small Alloy Cam Cleat - Red, Black Base

Features:

•  Hot-forged and hard anodized cams for maximum wear and corrosion resistance
•  Low effort line entry and exit due to unique teeth, line entry geometry and smooth finish
•  Unique self-cleaning, self-lubricating slotted bearings ensure consistent high performance even when subjected to high static loads
•  Superior resistance to sand and salt
•  Multi-coil spring generates near constant torque Easy entry/release and secure cleating of even the smallest diameter lines
•  Suitable for addition to swivel cleat bases for control lines and sheets
•  Small cleat has aluminium cams and a composite base for maximum durability and light weight
•  Medium cleat has an aluminium base and cams for maximum rigidity

Engineered for Performance
Intensive development efforts have produced this high performance range of cam cleats that provides unbeatable holding power while allowing easy cleating and releasing of control lines and sheets.

Alloy Cleats™
Aluminium cam models built for ultimate durability where high wear and high loads are encountered. Cams are hot-forged and hard anodized for maximum strength and corrosion resistance. Ronstan Alloy Cleat™ models are available in sizes small and medium. The medium cleat is built on an aluminium base for maximum rigidity whilst the small cleat has a composite base for an optimum blend of lightness and durability.

Slotted Bearings
Self lubricating, self-cleaning slotted bearings provide lower frictional resistance, quicker response times and superior resistance to sand and salt than ball bearings which can deform under load.

Multi-Coil Spring
The multi-coil spring recessed in the upper part of the cam generates near constant torque. This consistency ensures secure cleating of even the smallest lines with minimal abrasion or rope wear.

Unique Teeth and Entry Profiles
Low effort line entry and exit due to unique teeth and entry geometry.

Advanced Composite Base
Small cleat has a base produced from long fiber reinforced polymer to save weight while providing essential stiffness.

Customization
A comprehensive range of specialist cleat accessories allow customization of the cleat set-up to optimize performance by controlling inward lead, outward lead, cleating and uncleating angle and height.

Total Control
Swivel cleat bases further enhance the function of cleats providing articulation, and with some models setting of cleating angle and direction (up or down cleating) to allow control of lines and sheets from various positions on the boat.

Materials:

• Hard anodized aluminium cams
• Built on hard anodized aluminium base

Specifications:

• Rope: 3/32 - 5/16 in.
• Height: 3/4 in.
• Width: 1 in.
• Length: 1-7/8 in.
• Fastener: 5/32 in.
• Fastener Hole Centers: 1-1/16 in.
• M.W.L : 165 lbs.
• B.L : 330 lbs
• Weight: 0.9 oz.

Snap Shackle - Fixed Eye - 32mm(1-1/4") Length

Heavy duty plunger springs and precision components ensure dependable service. Body and hasp profiles are designed for easy clearance of lines and fittings when released. High strength to weight ratio. Split ring on plunger pin is spot welded for security. A lanyard can be attached to the plunger pin for easy opening.

Materials:

• Grade 15-5PH investment cast stainless steel body and hasp
  
• Grade 316 stainless steel plunger pin and spring

Snap Shackle - Fixed Bail - 66mm(2-5/8") Length

Heavy duty plunger springs and precision components ensure dependable service. Body and hasp profiles are designed for easy clearance of lines and fittings when released. High strength to weight ratio. Split ring on plunger pin is spot welded for security. A lanyard can be attached to the plunger pin for easy opening.

Materials:

• Grade 15-5PH investment cast stainless steel body and hasp
  
• Grade 316 stainless steel plunger pin and spring

Snap Shackle - Fixed Bail - 85mm(3-11/32") Length

Heavy duty plunger springs and precision components ensure dependable service. Body and hasp profiles are designed for easy clearance of lines and fittings when released. High strength to weight ratio. Split ring on plunger pin is spot welded for security. A lanyard can be attached to the plunger pin for easy opening.

Materials:

• Grade 15-5PH investment cast stainless steel body and hasp
  
• Grade 316 stainless steel plunger pin and spring

Snap Shackle - Small Swivel Bail - 69mm(2-3/4") Length

Heavy duty plunger springs and precision components ensure dependable service. Body and hasp profiles are designed for easy clearance of lines and fittings when released. High strength to weight ratio. Split ring on plunger pin is spot welded for security. A lanyard can be attached to the plunger pin for easy opening.

Materials:

• Grade 15-5PH investment cast stainless steel body and hasp
  
• Grade 316 stainless steel plunger pin and spring

Snap Shackle - Small Swivel Bail - 92mm(3-5/8") Length

Heavy duty plunger springs and precision components ensure dependable service. Body and hasp profiles are designed for easy clearance of lines and fittings when released. High strength to weight ratio. Split ring on plunger pin is spot welded for security. A lanyard can be attached to the plunger pin for easy opening.

Materials:

• Grade 15-5PH investment cast stainless steel body and hasp
  
• Grade 316 stainless steel plunger pin and spring

Snap Shackle Lanyard - 2" - Pair

Snap Shackle Lanyards:
Makes grabbing snap shackle pins easier to grab. Hand-braided white nylon. Attach to split ring

Snap Shackle Lanyard - 3" - Pair

Snap Shackle Lanyards:
Makes grabbing snap shackle pins easier to grab. Hand-braided white nylon. Attach to split ring