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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4.6 ★★★★★
Based on 28 reviews
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Verified Purchase
nick
Pawtucket, US
★★★★★ 5
Ralph Lauren quality without the price!!
Very soft sheets!! Exceptional quality! Good fit and great value! Got them for my guest bed on queen.. but hubby slept in there a few nights due to his back hurting. Gonna get some for the master king bed this spring. These are Ralph Lauren quality! And that’s all I have on my bed until now! We are those strange people that like sheets to feel cool when you get into bed.. and these are!
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Reviewed in the United States on January 13, 2026
J
Verified Purchase
JenKa
Charlottesville, US
★★★★★ 1
Disappointed in quality
Poorly made and not good quality. I had high hopes for these sheets because I love the color. However, after only the second laundering the hem stitching on the pillowcases is actually coming undone. Sleep-quality wise, I found the sheets a little scratchy for sateen, and while we’d hoped they would “sleep cool”, that is not the case. Unfortunately I washed them so I’m unable to return. They’ll go to the end of the line for rotation in emergencies only.
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Reviewed in the United States on May 3, 2026
J
Verified Purchase
JImmy
Belleville, US
★★★★★ 5
Good quality
Color: 01 - White, Size: Queen
I've had trouble with other all organic bedding on Amazon but this worked out. It did shrink a bit but it's cotton so it's supposed to do that. And it still fits on my bed pretty well so no complaints.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 21, 2026
S
Verified Purchase
Surrey Laine
Charlottesville, US
★★★★★ 4
Not quite “Hotel” quality
3.5 stars. My initial impressions are the followng: - Definitely not “Hotel” quality construction. I found these a bit thin and poorly stitched/constructed compared to what one would expect of hotel quality linens . - I doubt these are 500tc. They feel very flimsy, if I had to guess based on weight and feel alone I would assume 300tc at best. - Washing does make them softer as is typical with sateen which I would recommend before use as they feel like Polyester right out of the bag. Wash before use. - Color was interesting, not quite as expected. The grey/blue sheets have a seafoam green tint. Not bothersome enough for me to return. - They feel cool to the touch and should keep one comfortable while sleeping. I will update my review if that is not the case. Overall these are good sheets, but they are definitely not great/hotel quality. I’m keeping the ones I got for my children/guest rooms but will return mine as I really do want a higher quality sheet.
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Reviewed in the United States on March 28, 2026
M
Verified Purchase
Matt Thrower
Omaha, US
★★★★★ 2
Disappointed. Very thin.
Color: 01 - White, Size: King
These sheets are so thin. I bought the white color and you can see the mattress and the white stripes on the pillows through them. I love my Beckham pillows so I thought the quality would be better. I wasn’t in a rush to use them and unfortunately missed my return window.
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Reviewed in the United States on March 28, 2026

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