SKU: 34381210687

Ronstan Series 40 Ball Bearing Orbit Block - Single - Becket - Cleat - Swivel Head

Sale price$91.05 Regular price$101.17
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Description

Ronstan Series 40 Ball Bearing Orbit Block - Single - Becket - Cleat - Swivel HeadSeries 40 Ball Bearing Orbit Block Single Becket Cleat 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 Lightweight Kilogram for kilogram of working load, BB and RT Orbit Blocks are the worlds lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimizes the mass of

Series 40 Ball Bearing Orbit Block - Single - Becket - Cleat - 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

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 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.

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 It's 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. This gives minimum friction across the full working load range.

The floating sheave and bearing system is supported by a fiber-reinforced load frame. The design was computer modeled to be stress optimized.

Applications:

  • Mainsheet systems on spinnaker sheet on dinghies to 5m (16ft)
  • Spinnaker sheets on dinghies, sportsboats and small keel boats to 5m (16ft)
  • Halyard, vang and backstay applications on boats to 8m (26ft)
  • Control line applications on larger yachts

Materials:

  • Ball Bearings - High compression strength carbon black Acetal.
  • Stage 2 Bearing - Glass fibre reinforced, MoS2 impregnated Nylon
  • Frame/Cheeks - Toughened, glass fibre reinforced Nylon
  • Sheave - Carbon fiber reinforced, PTFE impregnated Nylon

Manufacturer : Ronstan
Manufacturer Part No : RF45130
UPC : 9316800455256
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 34381210687

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Cuba, US
★★★★★ 5
A Sensitive Skin Must
Size: 1.7 Fl Oz (Pack of 1)
Very smooth and easy to rub in. No white cast. Great for sensitive skin. Daughter has eczema and I have rosacea, we both use this sunscreen without any issues.
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Reviewed in the United States on March 22, 2026
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that Kelly girl
San Leandro, US
★★★★★ 5
Does well on my sensitive skin
Size: 1.7 Fl Oz (Pack of 1)
This is a good sunscreen, doesn't bother my sensitive skin or cause a roseacea flare up. It is a bit too dewy for my taste to wear just by itself, but does just fine when I use it under my makeup. If you like the "glass skin" look, it would be a good option.
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Reviewed in the United States on October 26, 2025
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Mile High Shark
Lexington, US
★★★★★ 5
This really works!
Style: SPF 50, Size: 1 Count (Pack of 1)
A week on the beach and no burns! It is a little hard to get rubbed in and I probably had a little bit of a white cast on my skin. So worth it though for the protection of me and the reefs.
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Reviewed in the United States on June 28, 2023
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emily
Lake Worth, US
★★★★★ 5
Great product
Style: SPF 50, Size: 1 Count (Pack of 1)
Great product - does leave a white cast but worth it for the healthier option
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Reviewed in the United States on August 22, 2025
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Bobbie
Chelsea, US
★★★★★ 3
Very white and thick
Style: SPF 50, Size: 1 Count (Pack of 1)
Great for protection but leaves you very white. Hard to rub in
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Reviewed in the United States on May 12, 2026

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