SKU: 42850872691

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

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Ships within 48 hours · Estimated delivery Aug 15 - Aug 20

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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: 42850872691

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4.6 ★★★★★
Based on 7 reviews
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R
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R. Lieberum
Lowell, US
★★★★★ 5
Engine Air Filter
Size: (Pack of 1)
This engine air filter fit perfectly in my 2018 Honda CR-V. No idea how it will perform but so far the Check Engine Light has not come on since installing the filter. Since there have been no problems I am happy with this filter and will likely buy again in the future. The filter does appear to be made from quality materials.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2026
K
Verified Purchase
Khan_Family
Dallas, US
★★★★★ 5
I love eco guard engine and air filter
Size: (Pack of 1)
Great price with good quality.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 3, 2026
M
Verified Purchase
M. Tibbetts
Fort Morgan, US
★★★★★ 4
My mileage on my 2021 Honda CRV dropped 4 miles /gallon with this air filter.
Size: (Pack of 1)
My mileage on my 2021 Honda CRV dropped 4 miles /gallon with this air filter. It did fit well and was easy to install, but then I watched my average around town mileage drop from 29-31mpg to 26-27 mpg thru 2 tank fillups. The Honda repair person said this filter looked like the Honda one and was surprised when we wanted to switch it out. Granted, it looked just like the Honda filter, but the folds on the Honda one are yellowish and I have to think there has to be some difference in the texture. The average mileage went back up within 10 miles of replacing it and 3 fill ups later it has continuously maintained its original average of 29-31 with the Honda filter.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 14, 2024
R
Verified Purchase
Randy Shiverdecker
Charlottesville, US
★★★★★ 5
As good as Original Manufacturer Equipment.
Size: (Pack of 1)
Cheaper than having the dealer or oil change store do it. Only takes a minute to replace your existing filter for a lot less than what they want to charge you. High quality too!
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Reviewed in the United States on January 9, 2026
E
Verified Purchase
Emmanuel C.
Waukegan, US
★★★★★ 5
Excellent Honda Alternative
Size: (Pack of 1)
I try to get everything and to keep everything as a manufacturer original on a car as possible. I will say that this filter is just as good as the Honda. The installation was very simple, you just need a screw driver to unscrew the 4 screws in the air box and this sits right in. The engine ran better and immediately got so much better MPG. I did not notice the engine struggling for air at all, if anything the car ran better. The fitment was the same size and just as good as the Honda. P.S Don't be like me. Don't hesitate to buy it. You'll love it. No questions asked!
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Reviewed in the United States on August 31, 2025

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