SKU: 5663223634

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 Aug 4 - Aug 9

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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: 5663223634

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4.5 ★★★★★
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Product Reviews
K
KKat 10
San Leandro, US
★★★★★ 5
Well made dividers.
Size: 88''W-4 Panel, Color: Grey
Very durable and stable. Once positioned, they stay upright and firm and don't wobble around. Good materials on both the panels and the frame that supports it. Great for any partitioning needs and a fair price for the quality you receive. Highly recommended.
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Reviewed in the United States on November 28, 2025
M
Verified Purchase
Martha
Dallas, US
★★★★★ 1
No se usó, llego incompleto
Size: 88''W-4 Panel, Color: Beige
Lo devolví, llego incompleto
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 11, 2026
R
Verified Purchase
raggmopp
Phoenix, US
★★★★★ 5
Great quality, very versatile
Size: 6 Panel-132‘’Wide, Color: Beige, Size: 6 Panel-132‘’Wide, Color: Beige
I'm very pleased with this item. It was not complicated to assemble but some items required dexterity and strength. The fabric panels are nice and tight and that's partly why it's a little hard to get that final screw in. I'm very pleased with the legs and the wheels. The metal components are nicely finished and feel substantial and endurable. I can easily fold this so many different ways… I can minimize the number of panels that are seen if desired and it can be straight or accordion. It's very stable which was hugely important to me because I'm fostering many many cats. It's not cheap looking and the light color fabric allows enough light to pass through that it doesn't darken the room substantially. I think the price was very reasonable
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Reviewed in the United States on May 7, 2026
S
Verified Purchase
Steven Chandler
Chelsea, US
★★★★★ 5
Affordable. And Good!
Size: 4 Panel-88‘’Wide, Color: Black
We use it everyday. All the pieces came and it was very easy to put up. High quality fabric, and easy to move around.
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Reviewed in the United States on May 21, 2026
J
Verified Purchase
julia
Battle Creek, US
★★★★★ 1
Don’t buy
Size: 4 Panel-88‘’Wide, Color: Black
Cheaply made. Had to return. Not durable at all.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 13, 2026

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