Manufacturer part #:RF45140
Technical Description
Series 40 BB Orbit Single Stand-Up Swivel Block
1 9/16 in
40 mm
5/16 in
9 mm
715 lb
325 kg
1430 lb
650 kg
2 oz
55 g
Manufacturer part #:RF45140
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 -grade 316 stainless steel Stainless steel shackle head for ultimate durability with harsh fixing points 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.
Applications
Mainsheet systems on spinnaker sheet on dinghies to 5 m (16 ft) Spinnaker sheets on dinghies, sportsboats and small keel boats to 5 m (16 ft) Halyard, vang and backstay applications on boats to 8 m (26 ft) 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
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.
Applications
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Light Weight Stand-Up
Replaced five 40 year old (heavy) Schaefer stand-ups at the mast step of our mini-tonner. After researching replacement alternatives for weeks, we settled on the Ronstans. We glassed in a solid backing plate, as well as glassed over the former mounting holes from the Schaefer blocks, the Ronstans perform to expectations and with the weight savings, means one less mile to walk or one more shake to drink !!!