RF45130 - Ronstan Series 40 Ball Bearing Orbit Block - Single - Becket - Cleat - Swivel Head

Series 40 Ball Bearing Orbit Block - Single - Becket - Cleat - 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

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.

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 fibre reinforced, MoS2 impregnated Nylon
• Frame/Cheeks - Toughened, glass fibre reinforced Nylon
• Sheave - Carbon fiber reinforced, PTFE impregnated Nylon

The Ronstan Series 40 Ball Bearing Orbit Block (part number RF45130) is a single block with a becket, cleat, and swivel head, designed for various marine rigging applications. It features a 2-stage orbital ball bearing system engineered to provide low friction across its working load range. The block utilizes high compression strength acetal ball bearings and a secondary full-contact bearing, supported by a fiber-reinforced load frame. This design aims to maximize load performance while maintaining a compact and low-profile form factor.

This product is suitable for IT and marine professionals managing rigging systems on dinghies up to 5m (16ft) for mainsheet and spinnaker sheet applications. It can also be used for halyard, vang, and backstay applications on boats up to 8m (26ft), or for control line applications on larger yachts. The block's construction, including carbon fiber reinforced sheave and glass fiber reinforced nylon frame, prioritizes durability and weight reduction for operational efficiency.