5/16" (9mm) Ronstan Ball Bearing Oribit Block/Cleat
- Ultra Lightweight
- Low friction 2-stage Orbital ball bearing system
- Highest working load in its class
- Low profile and compact
- High performance cleating
Kilogram for kilogram of working load, BB 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.
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.
Below is an example of a simple end-boom sheeting arrangement for small boats that uses the RF45130 plus one RF30100 and one RF30101. In fact this is exactly the sheeting system used in West Wight Potter 15's.
|Sheave Ø||1-9/16 in.||40 mm|
|Max. Rope Ø||5/16 in.||9 mm|
|Pin Ø||5/32 in.||4 mm|
|M.W.L.||715 lb.||325 kg|
|B. L.||1430 lb.||650 kg|
|Weight||3.7 oz.||105 g|