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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4.3 ★★★★★
Based on 13 reviews
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Jim
San Leandro, US
★★★★★ 5
Surprisingly good shirt for the price
Fit Type: Regular Fit, Color: White, Size: XX-Large
I’m generally pleased with my purchase. I got a 2XL because the website it would fit my neck. Around the waist it fit similar to Amazon Essentials work shirts (like mechanics use which I find comfortable). It was snug around the waist when sitting, but I can’t complain because I have a belly. I did find the neck snug when buttoning the top button so it means the neck is 18 or 18.5 and I wear a 19/19.5 to have 1-2 fingers space in the collar. The shirt is surprisingly thick like Amazon’s work shirts, much thicker than other dress shirts from another brand. And I am pleased that this shirt has button holes like other Amazon shirts does, all vertical button holes except the last one at the bottom which is horizontal. That feature keeps the shirt from unbuttoning itself during daily movement at the office. A very nice feature! I was a little disappointed in how it was packaged however but I have to press and wash it anyway.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 24, 2023
N
Verified Purchase
NORBERT YOUNG
Draper, US
★★★★★ 4
Nice shirt, excellent quality, nice cloth and buttons. No pockets A+
Fit Type: Regular Fit, Color: White, Size: Large
Nice quality shirt cut a little small. The shirt kind of needs to be pressed before wearing however at this price point and quality its a buy!
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Reviewed in the United States on May 19, 2026
P
Verified Purchase
PAMELA
Draper, US
★★★★★ 5
Fits perfect
Fit Type: Regular Fit, Color: Grey, Size: X-Large
This shirt is a perfect fit. I would buy it again in other colors.
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Reviewed in the United States on May 9, 2026
A
Verified Purchase
Amazon Customer
Whiting, US
★★★★★ 5
Comparable to high end mens shops!
Fit Type: Regular Fit, Color: Blue, Size: Large
Beautiful, heavy blue Oxford comparable to upper end mens store at 75% less! Full cut, great for casual wear or sending out for professional starching. Downside, no pocket, but I had mine monogramed wear the pocket would be and it looks like an expensive dress shirt. I bought more (with pockets) in blue & white
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Reviewed in the United States on May 3, 2026
A
Verified Purchase
Anon
Port Orchard, US
★★★★★ 3
Heavier fabric, very durable
Fit Type: Regular Fit, Color: Grey, Size: Large
3 stars. Pretty nice shirt but the fabric is a bit firmer than i like. I iron it when i usually wear it so that it looks half decent since wrinkle resistance is low or poor. I usually have to use a higher setting on the fabric since the material is thick making it alot heavier. Overall great for the lower end cost, anything that beats it would probably be double the price. I work in a cubicle so this works well for me, a simple shirt, with a simple color.
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Reviewed in the United States on March 18, 2026

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