Ronstan Series 30 Ball Bearing Block with Single Becket and Lashing Option

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

The Ronstan Series 30 Ball Bearing Block with Single Becket Option offers exceptional strength-to-weight ratio through the use of advanced composite reinforced polymer materials. Designed for high-performance applications, this block features a proven 2-stage bearing system with high compression grade Acetal ball bearings and a secondary full-contact bearing, ensuring minimal friction across a wide range of loads. Its lightweight construction is achieved with fibre-reinforced composites in the head, cleat arms, and beckets, making it ideal for demanding sailing and control line applications.
Built for versatility and ease of attachment, the single block can be securely lashed to various attachment points or connected using Dyneema Links or shackles. The Dyneema Link, crafted from high-strength SK75 fibre, offers a connection that is ten times stronger and lighter than steel, providing a reliable link from the load point to the block. This connection can be easily removed or replaced with a shackle or custom lashing, enhancing adaptability for different rigging setups. The block’s compatibility with Dyneema/Spectra lines, carbon laminate connection points, and webbing makes it a versatile choice for modern sailing systems.
The low-profile design of the Ronstan Series 30 block features a two-way head that allows for 0 or 90-degree alignment, along with full articulation through a swivel mechanism. The flexible Dyneema Link in multi-sheave configurations reduces weight further and maintains a compact profile, while carefully designed beckets minimize overall height. The self-lubricating Nylatron sheave and full-contact bearing system handle high dynamic loads efficiently, ensuring smooth operation and durability in demanding conditions.
Ideal for mainsheet and spinnaker sheet systems on dinghies up to 16 feet, as well as halyard, vang, and backstay applications on boats of similar size, the Ronstan Series 30 Ball Bearing Block is a reliable and efficient component for serious sailors. Its lightweight, high load capacity, and versatile attachment options make it suitable for control lines on larger yachts, providing optimal performance in a compact and durable package.

Features:

• Lightweight construction using composite reinforced polymers

• Highest working load in its class for demanding applications

• Secure and versatile attachment options including Dyneema Links and shackles

• Low profile and compact design for optimal space utilization

• Ultra low profile thru-sheave becket for minimized height

• Self-lubricating Nylatron sheave with full contact bearing for high dynamic loads