SKU: 76281869992

Ronstan Series 25 Ball Bearing Orbit Block - Becket Swivel Shackle [RF28100]

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Ships within 48 hours · Estimated delivery Aug 23 - Aug 28

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Description

Ronstan Series 25 Ball Bearing Orbit Block - Becket Swivel Shackle [RF28100]Series 25 Ball Bearing Orbit Block Becket & Swivel Shackle Single sheave ball bearing block with becket hub and swivel shackle head. Series 25 Ball Bearing Orbit Blocks, delivering superior strength, reduced weight, and exceptional performance for high demand dinghy and small boat applications. Designed with competitive sailors and performance boats in mind, these compact 25mm blocks are engineered to achieve the highest possible strength to weight

Series 25 Ball Bearing Orbit Block™ - Becket & Swivel Shackle

Single sheave ball bearing block with becket hub and swivel shackle head. 

Series 25 Ball Bearing Orbit Blocks™, delivering superior strength, reduced weight, and exceptional performance for high-demand dinghy and small boat applications.

Designed with competitive sailors and performance boats in mind, these compact 25mm blocks are engineered to achieve the highest possible strength-to-weight ratio. Featuring Ronstan’s renowned high compression strength acetal bearing system, the Series 25 BB Orbit Blocks™ are a lightweight yet durable solution, ideal for control line systems such as mainsheet and spinnaker sheet turning blocks, cunninghams, and cascading vangs on dinghies up to 4 meters.

Each block has a stainless steel hub for versatile lashing attachments and through-sheave becket functionality, making them adaptable to a wide range of rigging setups. The hub accommodates up to 4mm (5/32") lashing and ensures maximum efficiency without compromising reliability.

Features:

  • 2-stage ball bearing system.
  • Suits up to 8mm (5/16”) lines.
  • Hollow hub for becket take-off.
  • Lashing blocks suit up to 4mm (5/32”) lashing.

Specifications:

  • Max. Rope diameter (in): 5/16
  • M.W.L. (lb): 500
  • Sheave diameter (in): 1
  • B.L. (lb): 990
  • Weight (oz): 0.6

Applications:

  • Mainsheet and spinnaker sheet turning blocks on dinghies to 4m (13ft).
  • Control lines.
  • Cascading vangs.
  • Leech lines & cunninghams.

Materials:

  • Frame/cheeks: Toughened, glass fibre reinforced nylon.  
  • BB Sheave and balls: high compression strength acetal.
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: 76281869992

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4.8 ★★★★★
Based on 29 reviews
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Gina V. Peterson
Belleville, US
★★★★★ 1
Broke after 2 months.
Color: Bright White
This is 2 months old, it worked fantastic for 2 months It cleaned everything knew where it was going found its way home every time. Now it won't move it's turned on The brushes are spinning there's no way to turn it off and the button isn't working to power it down I have to let it sit and run for hours on its back so that it will die because there is no way to open it that I can find and there's no power off switch other than the one on the top which is not responding to me touching it.
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Reviewed in the United States on May 2, 2026
P
Verified Purchase
Polarbear62082
Carnegie, US
★★★★★ 4
Great for hard surfaces.
Color: Bright White, Color: Bright White
I love this vacuum for my hard floors. But make sure you check the clearance on all of your furniture as it gets stuck under my stuff easily. I am not a fan of the “mop” feature. It just drags around a wet swiffer pad. So obviously it doesn’t mop much. But for hard floors, this was a great purchase for the price! The quality of the vacuum is great! Even the packaging is nice. But I will say you need to look for the bigger filters as the K5 filters do not fit. Also, the app on your phone needs to be on the same WiFi as the vacuum or it disconnects and you need to reconnect it. I need to empty the collection bin every day, but I also have 4 dogs. I would definitely recommend this to someone with hard floors.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 1, 2025
B
Verified Purchase
Bren
Draper, US
★★★★★ 5
Best Purchase for my room
Color: White
I was skeptical at first but I’ve been using it for about 2-3 months, and it runs every day at 6am and it has never failed me. It always has a full filter at the end for the week, and the app is very good. When it would get stuck in places, it would always find a way out and I’ve never had to manually fix it. What’s even better is that there are 100-300 dollar roombas out there and yet this one has outperformed the expensive ones. They even are going to send me 4 free filters and 4 free brushes just for using it daily.
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Reviewed in the United States on November 26, 2025
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Verified Purchase
Chellz
Fort Morgan, US
★★★★★ 2
Doesn't last
Color: White
This product was working well. I used it daily but all of a sudden after 8 months it just stopped charging. I wish it actually lasted because it was a great product. But since it now no longer charges its of no use and a waste of money smh
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Reviewed in the United States on March 9, 2026
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Verified Purchase
We Are Bibliophiles
Birmingham, US
★★★★★ 5
Calidad
Color: Bright White
Buena
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Reviewed in the United States on June 1, 2026

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