Shop by Brand: Ronstan

Series 15 Ball Bearing Block - Triple

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

Series 15 Ball Bearing Utility Block - Double, 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

Series 15 Ball Bearing Utility Block - Pivoting Lead Block

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

Featuring a 4-point fastening for load distribution and low profile. Can be mounted without disassembly.

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

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

Series 15 Ball Bearing Utility Block - Triple Block, Becket, 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

Series 15 Ball Bearing Utility Block - Upright Lead Block

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

• Lightweight durable construction
  
• Economical
  
• Maintenance free

• Vang, cunningham and trapeze retriever systems on dinghies
  
• Leech line tackles, bunk adjusters, etc on larger boats

• U.V. stabilized acetal sheaves
  
• Grade 316 Stainless Steel cheeks

• Low friction
  
• High static and dynamic load capacity
  
• Lightweight
  
• Precision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance & low friction
  
• Two-Way head can be fixed at 0° or 90°

• Dinghy control lines
  
• Dinghy vangs
  
• Cunninghams
  
• Traveller controls

• Stainless steel ball bearings
  
• UV Stabilized Acetal sheave
  
• Grade 316 stainless steel load strap and head fitting
  
• Impact and UV resistant, fiber reinforced Nylon cheeks

• Low friction
  
• High static and dynamic load capacity
  
• Lightweight
  
• Precision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance & low friction

• Dinghy control lines
  
• Dinghy Vangs
  
• Cunninghams
  
• Traveller controls

• U.V. Stabilized Acetal sheaves
  
• Stainless steel ball bearings
  
• Grade 316 stainless steel load strap and head fitting
  
• Impact and UV resistant, fiber reinforced Nylon cheeks

• Low friction
  
• High static and dynamic load capacity
  
• Lightweight
  
• Suitable for screw or pop rivet mounting
  
• Precision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance & low friction

• Dinghy control lines
  
• Dinghy Vangs
  
• Cunninghams
  
• Traveller controls

• U.V. Stabilized Acetal sheaves
  
• Stainless steel ball bearings
  
• Grade 316 stainless steel load strap and head fitting
  
• Impact and UV resistant, fiber reinforced Nylon cheeks

• Low friction
  
• High static and dynamic load capacity
  
• Lightweight
  
• Precision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance & low friction
  
• Two-Way head can be fixed at 0° or 90°

• Dinghy control lines
  
• Dinghy vangs
  
• Cunninghams
  
• Traveller controls

• Stainless steel ball bearings
  
• UV Stabilized Acetal sheave
  
• Grade 316 stainless steel load strap and head fitting
  
• Impact and UV resistant, fiber reinforced Nylon cheeks

• Low friction
  
• High static and dynamic load capacity
  
• Lightweight
  
• Precision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance & low friction
  
• Two-Way head can be fixed at 0° or 90°

• Dinghy control lines
  
• Dinghy vangs
  
• Cunninghams
  
• Traveller controls

• Stainless steel ball bearings
  
• UV Stabilized Acetal sheave
  
• Grade 316 stainless steel load strap and head fitting
  
• Impact and UV resistant, fiber reinforced Nylon cheeks

• Low friction
  
• High static and dynamic load capacity
  
• Lightweight
  
• Precision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance & low friction
  
• Two-Way head can be fixed at 0° or 90°

• Dinghy control lines
  
• Dinghy vangs
  
• Cunninghams
  
• Traveller controls

• Stainless steel ball bearings
  
• UV Stabilized Acetal sheave
  
• Grade 316 stainless steel load strap and head fitting
  
• Impact and UV resistant, fiber reinforced Nylon cheeks

• 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

• Typically used for halyards at the mast base

• U.V. Stabilized Acetal sheaves
  
• Stainless steel ball bearings & Load housing

• Integrated stainless steel hub to accept lashing attachment and through-sheave becket
  
• Suits up to 4mm(5/32") lashing
  
• Includes 750mm (30") x 1.7mm(1/16") diam lashing

• Control lines on dinghies and catamarans to 5M(16')

• Sheave: High compression strength carbon acetal
  
• Ball bearings: stainless steel
  
• Frame/Cheeks: Nylon

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

Series 25 Utility Block - Single Swivel Ring Head

Features:

• Lightweight durable construction
• Economical
• Maintenance free

Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase.

Applications:

• Vang, cunningham and trapeze retriever systems on dinghies
• Leech line tackles, bunk adjusters etc on larger yachts

Materials:

• UV stabilized Acetal sheaves
• Grade 316 stainless steel cheeks

Series 25 Utility Block - Single, Becket, Loop Head

Features:

• Lightweight durable construction
• Economical
• Maintenance free

Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase.

Applications:

• Vang, cunningham and trapeze retriever systems on dinghies
• Leech line tackles, bunk adjusters etc on larger yachts

Materials:

• UV stabilized Acetal sheaves
• Grade 316 stainless steel cheeks

Series 30 Ball Bearing Block Single Becket Option Lashing

Ball Bearing Blocks™ boast the highest strength-to-weight ratio available.  This is achieved through all-composite reinforced polymer materials and multiple attachment options. Their precision design provides the optimum number of ball bearings for minimum friction while weight reduction is achieved through the use of fibre-reinforced composites in the block head, cleat arms and beckets. 

Highest Working Load in its Class

The proven Ronstan 2-stage bearing system (Series 30 and larger) features high compression grade Acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range.

The sheave and bearing system is supported by a fibre-reinforced load frame, computer modelled and optimised using advanced stress analysis methods. The Dyneema® Link, used in multi-sheave blocks, is produced from high spec SK75 fibre, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point.

Simple, Versatile & Secure Attachment

The single block is easily lashed to an attachment point, and can also accept Dyneema® Links and shackles for a variety of efficient attachment alternatives. The Dyneema® Link used in multi-sheave blocks is easily fitted and secured by a removable pin. The Dyneema® Link can also be removed and replaced by a shackle, custom lashing or strop.

These blocks are far more compatible with Dyneema®/Spectra® lines, carbon laminate connection points and webbing than traditional blocks with steel loop tops or shackles.

Low Profile & Compact

The two way head in the single lashing block allows for alignment at 0° or 90° orientation, while the single swivel block allows for full articulation.

The flexible Dyneema® Link used in multi-sheave blocks provides 0° or 90° orientation. It connects directly to the head of the block rather than to an intermediate head post. This reduces weight and gives the lowest possible profile while allowing full articulation. Beckets have been carefully designed to minimise height.

Features:

• Lightweight
• Highest working load in its class
• Secure, versatile and secure attachement
• Low profile and compact
• Ultra low profile thru-sheave becket
• Self-lubricating Nylatron® sheave and full contact bearing for high dynamic loads

Applications:

• Mainsheet systems and spinnaker sheets on dinghies to 5M(16')
• Halyard, vang and backstay applications on boats to 5M(16')
• Control line applications on larger yachts

• Lightweight
  
• Highest working load in its class
  
• Secure, versatile and secure attachement
  
• Low profile and compact

• Mainsheet systems and spinnaker sheets on dinghies to 5M(16')
  
• Halyard, vang and backstay applications on boats to 5M(16')
  
• Control line applications on larger yachts

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

• Lightweight
  
• Highest working load in its class
  
• Secure, versatile and secure attachement
  
• Low profile and compact

• Mainsheet systems and spinnaker sheets on dinghies to 5M(16')
  
• Halyard, vang and backstay applications on boats to 5M(16')
  
• Control line applications on larger yachts

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

• Lightweight
  
• Highest working load in its class
  
• Secure, versatile and secure attachement
  
• Low profile and compact
  
• Ultra low profile thru-sheave becket
  
• RF35101 accepts RF1850S shackle in both orientations to create a conventional loop top block
  
• Self-lubricating Nylatron® sheave and full contact bearing for high dynamic loads

• Mainsheet systems and spinnaker sheets on dinghies to 5M(16')
  
• Halyard, vang and backstay applications on boats to 5M(16')
  
• Control line applications on larger yachts

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

• Lightweight
  
• Highest working load in its class
  
• Secure, versatile and secure attachement
  
• Low profile and compact
  
• Ultra low profile thru-sheave becket
  
• Low friction 2-stage ball bearing system provides consistent performance over the full working load range

• Mainsheet systems and spinnaker sheets on dinghies to 5M(16')
  
• Halyard, vang and backstay applications on boats to 5M(16')
  
• Control line applications on larger yachts

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

• Lightweight
  
• Highest working load in its class
  
• Secure, versatile and secure attachement
  
• Low profile and compact

• Mainsheet systems and spinnaker sheets on dinghies to 5M(16')
  
• Halyard, vang and backstay applications on boats to 5M(16')
  
• Control line applications on larger yachts

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

Series 30 Utility Ball Bearing Block - Single, Becket, 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
• Cheek cut-outs for easy bearing maintenance

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.

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

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

Series 30 Utility Ball Bearing Block - Stand-up, Loop Top

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

Priduct 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.

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

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

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