SKU: 21363720135

Ronstan Series 40 Ball Bearing Orbit Block - Cheek [RF45151]

Sale price$30.34 Regular price$33.71
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Ships within 48 hours · Estimated delivery Jul 30 - Aug 4

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Description

Ronstan Series 40 Ball Bearing Orbit Block - Cheek [RF45151]Series 40 Ball Bearing Orbit Block Cheek Features: Ultra Lightweight Low friction 2 stage Orbital ball bearing system Highest working load in its class Low profile and compact High performance cleating Base suits curved mounting surface Low mounting points for maximum strength 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

Series 40 Ball Bearing Orbit Block - Cheek

Features:

  • Ultra Lightweight
  • Low friction 2-stage Orbital ball bearing system
  • Highest working load in its class
  • Low profile and compact
  • High performance cleating
  • Base suits curved mounting surface
  • Low mounting points for maximum strength

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.

Recommended fasteners - 3 x 4mm (5/32") countersunk head screws

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
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: 21363720135

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4.8 ★★★★★
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L. Bernadette Delisle
Belleville, US
★★★★★ 5
So happy with this product!
It is tasteless so I’m more likely to use it often. I have noticed a difference with more strength and less pain when doing manual labor soi know it’s effective. With all the shoveling and carrying wood in all the time for the stone, I really needed this! Plus I trust this company for quality products and whenever I need something high quality, I choose them
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Reviewed in the United States on December 13, 2025
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Kindle Customer
New York, US
★★★★★ 5
It needs a scoop otherwise love it.
Got this for my malabsorption that causes brain fatigue and fog. It's working great, too. The lid is a bit odd to open but seals well. My only issue is that it has no scoop. My measuring spoons now have to stay out with the creatine, so I get the proper dosage. If dosage isn't an issue for you, then great. otherwise you need to get another set of measuring spoons.
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Reviewed in the United States on December 30, 2025
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Verified Purchase
Gary S.
Draper, US
★★★★★ 5
Great product
I'm not a body builder, at 76 years old I was having muscle aches, and this helps. I take it daily at one teaspoon in my morning coffee.
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Reviewed in the United States on May 4, 2026
M
Verified Purchase
Matt
West Palm Beach, US
★★★★★ 5
Highest quality ingredients & secure delivery
Excited to see Pure offer a creatine formula as I already use other products from this highly rated brand. The powder is excellent quality and mixes well. I added it to my protein shake and there was no impact to taste. It digests easily & I experienced zero negative side effects. The paper canister is a unique, sustainable package. While this may be better than plastic, I had a concern it might get damaged in transit. I was encouraged to see it delivered in a firm cardboard box that was securely protected. The container seals well & is an innovative upgrade from normal bottles. This is an excellent addition to my routine. Looking forward to seeing the benefits in the coming weeks!
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Reviewed in the United States on November 5, 2025
T
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Traveling gal
Belleville, US
★★★★★ 4
New packaging for PURE product
I am hoping this creatinine is as good as other Pure products. This creatinine came in a cardboard container instead of plastic. I appreciate the effort to remove plastic from the food stream, but the lid tip did not work so well. It was hard to open the top, but once that was done, the “inner lid” was easy to open, you just don’t want to drop this because it’s l8kely to spill open. The lid is not really secure.
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Reviewed in the United States on April 11, 2026

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