Series 55 Ball Bearing

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Orbit Block™

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Ultra Lightweight
Low friction 2-stage Orbital ball bearing system
Highest working load in its class
Low profile and compact
High performance cleating

The Ronstan Quick-Lock™ is the quickest and most user friendly winch handle available for racing and cruising sailors alike


Product No.	Desc.	Sheave Ø	Max. Rope Ø	Max. Cable Ø	Pin Ø	M.W.L.	B. L.	Weight	Price RRP
		mm	mm	mm	mm	kg	kg	g

RF55101 >	Single	55	10	-	-	500	1000	68	$ 51.79
RF55110 >	Single, becket, swivel head	55	10			500	1000	88	$ 58.92

RF55111 >	Single, becket	55	10	-	-	500	1000	75	$ 56.21

RF55151 >	Cheek	55	10	-	-	500	1000	70	$ 50.39

RF55171 >	Upright lead	55	10	-	-	500	1000	91	$ 57.52

RF55201 >	Double	55	10		-	800	1600	134	$ 101.76

RF55210 >	Double, becket, swivel shackle head	55	10			750*	1500	172	$ 123.27

RF55301 >	Triple	55	10	-	-	1000	2000	205	$ 161.50

RF55310 >	Triple, becket, swivel shackle head	55	10			750*	1500		$ 176.75

RF55410 >	Quad, becket, swivel shackle head	55	10			750*	1500	316	$ 228.42

RF55501 >	Fiddle*	55 + 35	10	-	-	500	1000	95	$ 70.07

RF55510 >	Fiddle, Becket, Swivel Head	55 + 35	10			500	1000	101	$ 77.00

RF55511 >	Fiddle, becket*	55 + 35	10	-	-	500	1000	97	$ 74.95

RF55521 >	Fiddle, adjustable cleat*	55 + 35	10	-	-	500	1000	231	$ 128.12

RF55530 >	Fiddle Becket Cleat, Swivel Head*	55 + 35	10			500	1000	237	$ 143.00

RF55531 >	Fiddle, becket, adjustable cleat*	55 + 35	10			500	1000	223	$ 133.23

NOTE: These blocks have been specifically designed and optimised for use on racing sailboats and the conditions encountered in this unique application. They should not be assumed suitable for other non-marine or industrial applications. For further details on associated risks see
Orbit Block Usage and Considerations

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. The Dyneema^® Link is produced from FSE Robline SK75 fibre, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point.

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

Ball bearings - High compression strength carbon black Acetal
Stage 2 bearing - Carbon fibre reinforced, PTFE impregnated Nylon
Frame/Cheeks - Toughened, glass fibre reinforced Nylon
Rope Link: UV stabilised, multi-strand impregmented SK75 Dyneema®

	Product No.	Description


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