SKU: 31563778061

Ronstan Series 55 Ball Bearing Orbit Block - Single - Becket - Swivel Head

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Description

Ronstan Series 55 Ball Bearing Orbit Block - Single - Becket - Swivel HeadSeries 55 Ball Bearing Orbit Block Single Becket Swivel Head 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 minimises 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

Series 55 Ball Bearing Orbit Block™ - Single - Becket - Swivel Head

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 minimises 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 Its Class
The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximises 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 modelled to be stress optimised. The Dyneema® Link is produced from FSE Robline SK75 fiber, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point.

Features:

  • Ultra Lightweight
  • Low friction 2-stage Orbital ball bearing system
  • Highest working load in its class
  • Low profile and compact
  • High performance cleating
  • Swivel shackle head for unlimited block rotation
  • Stainless steel shackle head for ultimate durability and compatibility with harsh fixing points
  • Ultra low profile integrated becket


Applications:
  • Mainsheet systems on dinghies, sportsboats and small keelboats to 9M(30')
  • Spinnaker sheets on dinghies, sportsboats and small keel boats to 9M(30')
  • Halyard, Vang and Backstay application on boats to 8M(26')
  • Control line applications on larger yachts
  • Ideal use for mainsheet systems and spinnaker sheets on dinghies, sportsboats and small keel boats to 9M(30')
  • Also ideal with halyard, vang and backstay applications on boats to 8M(26')
  • Spinnaker sheets on sportsboats and small keel boats (lateral lead blocks)
  • Control line applications on larger yachts


Materials:
  • Ball bearings - High compression strength carbon black Acetal
  • Stage 2 bearing - Carbon fiber reinforced, PTFE impregnated Nylon
  • Frame/Cheeks - Toughened, glass fiber reinforced Nylon
  • Rope Link: UV stabilized, multi-strand impregmented SK75 Dyneema®
  • Sheave: Carbon fiber reinforced, PTFE impregnated Nylon
  • Head fitting: Grade 316 stainless steel.


Specifications:
Sheave Ø: 55mm(2-5/32")
Max. Rope Ø: 10mm(3/8")
M.W.L.: 500kg(1,100lbs)
B. L.: 1,000kg(2,200lbs)
Weight: 88g(3.1oz)
Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 31563778061

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4.5 ★★★★★
Based on 7 reviews
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A
Verified Purchase
Adam Finnemeyer
Pawtucket, US
★★★★★ 5
Great practice for the summer
Format: Paperback, Format: Paperback
I bought this book to use with my son the summer between kindergarten and 1st grade. I love that it has a variety of topics it covers including spelling, sight words, reading comprehension, and a mix of math skills. My son loves the colorful pages and variety of activities. He also loves that there are stickers included for when he completes each page. Would absolutely recommend this, especially for reluctant/high energy learners.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 28, 2024
A
Verified Purchase
Amazon Customer
Pawtucket, US
★★★★★ 5
Fun workbook for pre1st grade.
Format: Paperback
My great granddaughter loved the workbook, easy to follow. She will be starting 1st grade next month so she was excited. Plus when they complete a page you can give them a gold star. (Stickers with book)
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Reviewed in the United States on July 17, 2025
S
Verified Purchase
SD
Bozeman, US
★★★★★ 5
.
Format: Paperback
Good for Kids
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Reviewed in the United States on March 3, 2026
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Verified Purchase
Bridget Sheppard
West Palm Beach, US
★★★★★ 5
The perfect summer romance in a beautiful setting!
Format: Kindle
I give this book 4.75 stars rounded up to five for the purposes of this review. I really liked this story and flew through! Anyone looking for a great summer romance can find it here. This was my first Carley Fortune book, but I’d like to read more (and plan to read the sequel to this one very soon). It was so fun to experience Percy and Sam’s relationship as it developed from close friends at the age of thirteen to something much more as they got older. Their relationship was so deep and respectful. They knew everything about each other and shared so many wonderful experiences together. It felt like a very natural evolution from friendship to romance (although I did want to smack Sam a couple times, but he was young, so I’ll give him a pass). And the setting of Barry’s Bay was a beautiful, relaxing place. I wish I could live in a cabin on that lake! There were some great side characters in this book too. Sue was such a kind, loving person. Charlie was sometimes difficult to like, but he really wasn’t a bad person. Delilah definitely annoyed me at times, but she turned out to be such a good friend to Percy. I wish we’d gotten a little bit more of Chantal, because she also seemed like an amazing friend. I don’t always like a miscommunication trope in terms of breakups in romances, but this one actually made sense, because Percy and Sam were so young and trying to figure themselves out, as well as their romantic relationship. So, that part of it didn’t turn me off the overall story. I loved the ending (it made me cry), although I wish Sue’s storyline could have been different. In my opinion, this was the perfect summer romance, so if that’s what you’re looking for, I would definitely encourage you to read it!
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Reviewed in the United States on July 19, 2025
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Sjeswani23
Dallas, US
★★★★★ 4
Sam + Percy 💕
Format: Kindle
Every Summer After is a perfect summer read and although it had been in my TBR for so long, I really enjoyed it. I’m a sucker for second chance romance and childhood friends to lovers and I was captivated immediately. Their friendship blossomed into a cute young love romance until one impulsive decision during a vulnerable moment lead to the downfall of Sam & Percy’s relationship. Now over a decade later, Percy makes the trip back to the lake to attend a funeral and memories flood back of her summers with Sam. But does time heal all wounds? Read to find out. I really love young love romances because they are innocent with heighten emotions, personal growths and can be extremely messy. Not to mention the angst that keeps me wanting to read more and this book definitely kept me engaged.
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Reviewed in the United States on September 7, 2025

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