Block single Orbit Cheek 40mm

Ultra Lightweight
Low friction 2-stage Orbital ball bearing system
Highest working load in its class
Easily fitted and securely retained Dyneema® Link head
Low profile and compact
High performance cleating
Recessed underside to suit curved mounting surface
Low mounting points for maximum strength

Ball bearing, carbon fiber reinforced nylon sheath, Dyneema or shackle buckle attachment.

Overall length: 60 mm
Sheave Ø 40 mm
Max. Rope Ø 9 mm
Max. Cable Ø - mm
Pin Ø - mm
M.W.L. 325 kg
B. L. 700 kg
Weight 32 g

Product Information

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 fibre-reinforced load frame. The design was computer modelled to be stress optimised.

User Instructions
For comprehensive details including user instructions, and for spare part tables, and fastener sizes view in various languages using the following links BB & RT OrbitBlock User Instructions (English), BB & RT OrbitBlock User Instructions (French), BB & RT OrbitBlock User Instructions (German)

Recommended fasteners -
3 x 4mm (5/32") countersunk head screws

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 stregnth carbon black Acetal.
Stage 2 Bearing - Glass fibre reinforced, MoS2 impregnated Nylon
Frame/Cheeks - Toughened, glass fibre reinforced Nylon
Sheave - Carbon fibre reinforced, PTFE impreganated Nylon