SKU: 17871623759

Series 40 Ball Bearing Orbit Block™, Lightweight Cheek

Sale price$155.25 Regular price$172.50
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Description

Series 40 Ball Bearing Orbit Block™, Lightweight CheekLightweight single sheave 40mm cheek block, requires 3 x 4mm (5 32") fasteners FEATURES Ultra Lightweight. Low friction 2 stage Orbital ball bearing system. Highest working load in its class. Low profile and compact. High performance cleatingBase suits curved mounting surface. Low mounting points for maximum strength. SPECIFICATIONS Product Specifications Type of Block Cheek Foot Sheave diameter (mm) 40mm B. L. (kg) 700 M. W. L. (kg) 325 Max. Rope

Lightweight single sheave 40mm cheek block, requires 3 x 4mm (5/32") fasteners

FEATURES

Ultra Lightweight.

Low friction 2-stage Orbital ball bearing system.

Highest working load in its class.

Low profile and compact.

High performance cleatingBase suits curved mounting surface.

Low mounting points for maximum strength.

SPECIFICATIONS

Product Specifications
Type of Block Cheek/Foot
Sheave diameter (mm) 40mm
B.L. (kg) 700
M.W.L. (kg) 325
Max. Rope diameter (mm) 9
Weight (g) 32
Fastener Ø (mm) 4
Qty. Fasteners 3

 

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 fibre-reinforced load frame. The design was computer modelled to be stress optimised.

Recommended fasteners - 3 x 4mm (5/32") countersunk head screws.

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: 17871623759

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★★★★★ 5
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Reviewed in the United States on January 23, 2026
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Big Foot
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Color: Silver
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Reviewed in the United States on January 13, 2026
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M. Altvater
Louisville, US
★★★★★ 5
Coffee!
Color: Silver
Holds coffee, looks nice
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★★★★★ 5
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