Ball Bearing

RF55510

Series 55 Orbit Block™, Fiddle with Becket

Fiddle block with Becket and Swivel Head

FEATURES

Ultra Lightweight.

Low friction 2-stage Orbital ball bearing system.

Highest working load in its class.

Low profile and compact.

Specifications

Product Specifications
Pin Ø (in)3/16
Max. Rope diameter (in)3/8
M.W.L. (lb)1100
Sheave diameter (in)2 5/32 + 1 3/8
B.L. (lb)2200
Weight (oz)3.6
$77.06
$77.06
 

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.

Technical Information

Applications

  • Mainsheet systems on dinghies, sportsboats and small keelboats to 9m (30ft).
  • Halyard, Vang and Backstay application on boats to 8m (26ft).
  • Control line applications on larger yachts.

 

Materials

  • Ball bearings - High compression strength Acetal
  • Stage 2 bearing - Carbon fibre reinforced, PTFE impregnated Nylon
  • Frame/Cheeks - Toughened, glass fibre reinforced Nylon

 

Resource Files

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