SKU: 21363720135

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 Sep 27 - Oct 2

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For Your Every Summer RSVP, with Code: SUMMER15

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: 21363720135

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4.3 ★★★★★
Based on 30 reviews
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MD
Waukegan, US
★★★★★ 5
Comfort
Size: 10, Color: Egret/Lavender/Multi
Exactly like picture and so cute. Usually wear size 9 in HeyDude and got 10 , fits perfect and so comfortable like all my Hey dude’s.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
A
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Amazon Customer
Birmingham, US
★★★★★ 5
Great support and pretty.
Cute and comfortable. Good deal. Love the chunky, soft platform sole. Might purchase the cream colored ones also. I have planters faceitis and these were comfortable all day.
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Reviewed in the United States on April 16, 2026
A
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Amber
Whiting, US
★★★★★ 5
Buy these! Theyre my new favorite! Get two! Three? Four? Leave some for me!
Size: 8, Color: Egret/Lavender/Multi
Okay im absolutely freaking obsessed with these shoes! These are so darn comfortable AND cute! Im going to be buying only these for sandals from here on out. Im short, like 5 ft. I like that these give me a little height, but while also being so stupid comfortable that I can wear them legit all day long. I have arthritis and my feet tend to swell if im not comfortable. So these are my new favorite shoe for sure!
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Reviewed in the United States on May 20, 2026
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Verified Purchase
B
Natrona Heights, US
★★★★★ 4
Ehh they’re cute and cheap so I’m good with it
Almost hard to walk in because they’re so squishy. But they’re comfy and cute. Just takes some getting used to. I think the quality is pretty good considering I paid $20.
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Reviewed in the United States on May 31, 2026
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Verified Purchase
GoodGood
Lowell, US
★★★★★ 5
The best sandals ever
Size: 8, Color: Black/White, Size: 8, Color: Black/White
These are the most comfortable sandals for the summertime! Not only is the design totally 90's inspired but I also feel like I'm walking on a couple of bouncy clouds! You will not regret buying these!
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Reviewed in the United States on May 26, 2026

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