Ronstan Series 55 Ball Bearing Orbit Block Single Becket Swivel Head for Boats

Series 55 Ball Bearing Orbit Block™ - Single - Becket - Swivel Head

Lightweight
Kilogram for a 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.

Highest Working Load In Its 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.
Features:


Ultra Lightweight

Low friction 2-stage Orbital ball bearing system

Highest working load in its class

Low profile and compact

High performance cleating

Swivel shackle head for unlimited block rotation

Ultra low profile integrated becket

Applications:


Mainsheet systems on dinghies, sports boats and small keelboats to 9M(30')

Spinnaker sheets on dinghies, sports boats and small keel boats to 9M(30')

Halyard, Vang and Backstay application on boats to 8M(26')

Control line applications on larger yachts

Ideal use for mainsheet systems and spinnaker sheets on dinghies, sports boats and small keel boats to 9M(30')


Materials:


Ball bearings - High compression strength carbon black Acetal

Stage 2 bearing - Carbon fiber reinforced, PTFE impregnated Nylon

Frame/Cheeks - Toughened, glass fiber reinforced Nylon

Sheave: Carbon fiber reinforced, PTFE impregnated Nylon

Head fitting: Grade 316 stainless steel.

Specifications:
Sheave Ø: 55mm(2-5/32")
Max. Rope Ø: 10mm(3/8")
M.W.L.: 500kg(1,100lbs)
B. L.: 1,000kg(2,200lbs)
Weight: 88g(3.1oz)