RF48151 - Ronstan Series 40 Ball-Bearing Cheek Block

Ronstan Series 40 Ball-Bearing Cheek Block

The Ronstan Series 40 ball-bearing cheek blocks are engineered for optimal strength, performance, and reliability. They boast class-leading dynamic and static load ratings, making them the top choice in their category. Constructed with lightweight, toughened glass fiber reinforced nylon for cheeks, these blocks replace traditional stainless steel straps, enhancing both performance and durability.

This versatile range includes single swivel blocks and options for single and double sheave configurations, suitable for lashing or soft attachments. Users can build advanced systems, including a 12:1 purchase mainsheet system ideal for performance catamarans.

The blocks feature a carbon-reinforced C-Cleat™ for secure rope retention, with low entry and exit efforts, complemented by fairleads for quick action from any angle. Stainless steel cleat arms are adjustable for personalized cleating angles.

Ball-bearing configurations utilize a unique 2-stage bearing system, significantly reducing friction, along with a full-contact bearing to ensure low friction throughout the complete working load range.

High Load versions are tailored for applications facing significant dynamic or static loads, equipped with a high-strength 2205 stainless steel sheave and hub, alongside a triple bearing race to minimize friction under high loads.

Applications:

• Mainsheet systems and spinnaker sheets on dinghies and off-the-beach catamarans (up to 8m or 26ft).
• Halyard, vang, and backstay systems on boats up to 9m (30ft).
• Control line applications on larger yachts.

Specifications:

• Sheave Ø: 1-9/16 in.
• Max. Rope Ø: 3/8 in.
• M.W.L.: 880 lb.
• B. L.: 1760 lb.
• Weight: 1.2 oz.

The Ronstan Series 40 Ball-Bearing Cheek Block, part number RF48151, is a component designed for marine rope management systems. It features a 1-9/16 inch sheave diameter and accommodates ropes up to 3/8 inch. Constructed with glass fiber reinforced nylon cheeks, this block offers a lightweight alternative to traditional stainless steel strap designs. It incorporates a 2-stage ball-bearing system intended to reduce friction across its working load range. The block has a Maximum Working Load (M.W.L.) of 880 lb and a Breaking Load (B. L.) of 1760 lb, with a weight of 1.2 oz. This product is suitable for mainsheet and spinnaker sheet applications on dinghies and catamarans up to 8m (26ft), and for halyard, vang, and backstay systems on boats up to 9m (30ft). It can also be integrated into control line applications on larger yachts. The design aims to provide reliable rope guidance and load handling for various sailing setups.