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 20 - Jul 25

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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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4.5 ★★★★★
Based on 12 reviews
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Verified Purchase
Pamela J Arrowood
Grantham, US
★★★★★ 5
Works great
Material Type: Three Tiers Cart
Easy assembly. Perfect for moving around bar area. Rolls nicely. A lot of room..
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 9, 2026
C
Verified Purchase
Cynthia Mills
Lexington, US
★★★★★ 5
Love this cart
Material Type: Three Tiers Cart
Love this cart. It’s sturdy and looks great in my kitchen I put my microwave on it and my toaster oven. It’s easy to pull around. I highly recommend it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 9, 2026
C
Verified Purchase
C. J.
Carnegie, US
★★★★★ 1
Not pleased- No holes predrilled in wood!
Love the look of it and should have been a good review BUT there were absolutely no holes drilled and a total of 64 screws to put in. So I have 2 slabs of solid wood and the pipes. I could have purchased and made it myself if it doesn’t even come with pre drilled holes in the wood. Have to get someone to drill all the holes for me and hope the can line them up properly before I can put together. Hope it works as returning this large and heavy of an item would be difficult. Very disappointed in what should have been a great item.
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Reviewed in the United States on December 19, 2025
J
Verified Purchase
J. Minor
Alexandria, US
★★★★★ 5
Good value
Material Type: Three Tiers Cart, Material Type: Three Tiers Cart
Assembly was a little awkward but doable.
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Reviewed in the United States on September 2, 2025
M
Verified Purchase
Mary Owens
Bozeman, US
★★★★★ 5
Nice for storing canned/ bottled drinks
Material Type: Three Tiers Cart
Great. Wish I could've gotten it in a darker brown color, but it serves it's purpose.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 10, 2026

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