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Description
Ronstan Orbit Series 55 Fiddle Block w/ Becket & Swivel HeadProduct Description Ronstan Orbit Series 55 Fiddle Block w Becket & Swivel Head Features: Ultra Lightweight Low friction 2 stage Orbital ball bearing system Highest working load in its class Low profile and compact High performance cleating Sheave 2 5 32 + 1 3 8 in. (55 + 35mm) Max. Rope 3 8 in. (10mm) Max. Cable in (mm) Pin in. (mm) M. W. L. 1100 lb. (500 kg.) B. L. 2200 lb. (1000 kg.) Weight 3. 6 oz. (101 g.) Product Information: Lightweight
Product Description
Ronstan Orbit Series 55 Fiddle Block w/ Becket & Swivel Head
Features:
Ultra Lightweight
Low friction 2-stage Orbital ball bearing system
Highest working load in its class
Low profile and compact
High performance cleating
Sheave Ø - 2 5/32 + 1 3/8 in. (55 + 35mm)
Max. Rope Ø - 3/8 in. (10mm)
Max. Cable Ø - in (mm)
Pin Ø - in. (mm)
M.W.L. - 1100 lb. (500 kg.)
B. L. - 2200 lb. (1000 kg.)
Weight - 3.6 oz. (101 g.)
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. 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.
Applications:
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
Materials:
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®
Features:
Sheave Ø - 2 5/32 + 1 3/8 in. (55 + 35mm)
Max. Rope Ø - 3/8 in. (10mm)
Max. Cable Ø - in (mm)
Pin Ø - in. (mm)
M.W.L. - 1100 lb. (500 kg.)
B. L. - 2200 lb. (1000 kg.)
Weight - 3.6 oz. (101 g.)
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. 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.
Applications:
Materials:
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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★★★★★ 5
Winner!
Pattern Name: Strip, Size: 10 Packs (Box)
My dogs favorite treats. Winner!
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Reviewed in the United States on January 12, 2026
★★★★★ 5
So far these vitamins are good
I bought these vitamins because I noticed my hair was starting to fall out/get thinner. So far I think they might be helping.
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Reviewed in the United States on May 25, 2026
★★★★★ 5
Health in a bottle
Taken daily 1x, seem to be of good use for current recommended health guidelines.
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Excellent
Excellent
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Would recommend
Great multivitamin! I started to see a difference in my hair and skin.
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Reviewed in the United States on April 28, 2026