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Series 60 Core Block™ - Single - Becket
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
Pin: 2205 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: 275g(9.7oz)
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102.67 |
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Series 75 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 14M (46')
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: 75mm(3")
Max. Rope Ø: 14mm(9/16")
Pin Ø: 8mm(5/16")
M.W.L.: 1,500kg(3,300lbs)
B. L.: 3,000kg(6,600lbs)
Weight: 354g(12.5oz)
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102.67 |
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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)
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179.33 |
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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
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91.80 |
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Series 30 Utility Block- Double, Tube Rivet
Features:
Lightweight durable construction
Economical
Maintenance free
Product Information:
Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance.Hollow rivets accept fixing screws, shackles or can be used as a becket for extra purchase.
Applications:
Vang, cunningham and trapeze retriever systems on dinghies
Leech line tackles, bunk adjusters etc on larger yachts
Materials:
U.V. stabilized Acetal sheaves
Grade 316 stainless steel cheeks
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17.00 |
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Series 30 Utility Block- Cheek, Curved Base
Features:
Lightweight durable construction
Economical
Maintenance free
Product Information:
Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance.
Applications:
Vang, cunningham and trapeze retriever systems on dinghies
Leech line tackles, bunk adjusters etc on larger yachts
Materials:
U.V. stabilized Acetal sheaves
Grade 316 stainless steel cheeks
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19.66 |
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Series 30 Utility Block- Double, Loop Top
Features:
Lightweight durable construction
Economical
Maintenance free
Product Information:
Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance.
Applications:
Vang, cunningham and trapeze retriever systems on dinghies
Leech line tackles, bunk adjusters etc on larger yachts
Materials:
U.V. stabilized Acetal sheaves
Grade 316 stainless steel cheeks
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23.14 |
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Series 30 Utility Block - Triple, Loop Top
Features:
Lightweight durable construction
Economical
Maintenance free
Product Information:
Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance.
Applications:
Vang, cunningham and trapeze retriever systems on dinghies
Leech line tackles, bunk adjusters etc on larger yachts
Materials:
U.V. stabilized Acetal sheaves
Grade 316 stainless steel cheeks
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30.67 |
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Series 30 Utility Block- Double, Loop Top and Becket
Features:
Lightweight durable construction
Economical
Maintenance free
Product Information:
Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance.
Applications:
Vang, cunningham and trapeze retriever systems on dinghies
Leech line tackles, bunk adjusters etc on larger yachts
Materials:
U.V. stabilized Acetal sheaves
Grade 316 stainless steel cheeks
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26.46 |
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Series 20 BB Block Single Becket Option Lashing High Load
Features:
Suits up to 4mm (5/32”) lashing
Supplied with 750mm (30”) x 2mm (3/32”) diameter,
Dyneema® single braid lashing line
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49.34 |
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Series 20 Lead Block - Single Pivoting Sheave
Features:
180 degree pivoting sheave
Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Precision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance & low friction.
Applications:
Pivoting version suits controls that need to be trimmed from either side of the boat.
Materials:
Grade 316 stainless steel ball bearings
UV stabilized Acetal sheave
Grade 316 stainless steel load housing
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29.11 |
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Series 30 Utility Ball Bearing Block - Single, Swivel Shackle Head
Features:
Low friction 2-stage ball bearing system provides consistent performance over the full working load range.
High static and dynamic load capacity.
Light weight
Versatile head fittings
Product Information:
Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Can be fitted with a shackle in either of two planes to allow correct alignment of the block.
Applications:
Primary lead blocks on dinghies and catamarans
Control lines on larger yachts
Materials:
U.V. stabilized Acetal sheaves
Acetal ball bearings
Impact modified, fiber reinforced and U.V. stabilized Nylon cheeks
Grade 316 stainless steel load straps and head fittings
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23.11 |
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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)
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23.98 |
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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)
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35.98 |
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Series 15 Ball Bearing Utility Block - Single Block, Loop Head
Features:
Smallest and lightest ball bearing block available
Precision molded acetal sheave running on stainless steel ball bearings provide high performance & low friction
Single loop head blocks include an O-ring to separate running line from head lashing or fixing
Applications:
Dinghy control lines
Vangs, cunninghams and tweakers
Shock cord tensioning systems
Materials:
BB sheaves: UV stabilized acetal
Ball bearings: Stainless steel
Cheeks: Grade 316 stainless steel
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9.40 |
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