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Description
Ronstan Series 40 All Purpose Single Cheek BlockProduct Description Ronstan Series 40 All Purpose Single Cheek Block Features Exceptionally high working loads Low maintenance, long service life Self lubricating sheave Sheave 1 9 16 in. Max. Rope 7 16 in. Max. Cable in Pin in. M. W. L. 880 lb. B. L. 2200 lb. Weight 2. 3 oz. Product Information All purpose (AP) blocks are a great all around solution. Self lubricating Acetal polymer sheaves running on polished stainless steel races perform equally
Product Description
Ronstan Series 40 All Purpose Single Cheek Block
Features
Exceptionally high working loads
Low maintenance, long service life
Self-lubricating sheave
Sheave Ø - 1 9/16 in.
Max. Rope Ø - 7/16 in.
Max. Cable Ø - in
Pin Ø - in.
M.W.L. - 880 lb.
B. L. - 2200 lb.
Weight - 2.3 oz.
Product Information
All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.
Can be mounted on masts and booms using the curved surface adapter. Can be stacked to create a double version, but no more than 60% of the rated working load should be applied to the upper sheave.
Applications
Mainsheet
Halyard
Vang
Spinnaker control lines on off-the-beach catamarans, one design classes and sports boats up to 8m (26ft)
Materials
U.V. stabilized Acetal sheaves
Impact and U.V. resistant, fiber reinforced Nylon cheeks
Grade 316 stainless steel bearing race
Grade 316 stainless steel cheeks
Features
Sheave Ø - 1 9/16 in.
Max. Rope Ø - 7/16 in.
Max. Cable Ø - in
Pin Ø - in.
M.W.L. - 880 lb.
B. L. - 2200 lb.
Weight - 2.3 oz.
Product Information
All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.
Can be mounted on masts and booms using the curved surface adapter. Can be stacked to create a double version, but no more than 60% of the rated working load should be applied to the upper sheave.
Applications
Materials
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.6 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
The best no show socks
The only no show socks I have ever found that do not slide down. These are very comfortable and the extra tab on the back provides comfort by keeping shoes from rubbing the back of your foot. The top of the sock also comes up high enough to cushion the top of your foot all while still remaining hidden while wearing tennis shoes or even with my hey dudes.
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Reviewed in the United States on November 30, 2025
★★★★★ 5
Great quality and fast shipping
Size: Medium, Color: (001) Black / Black / Castlerock
These socks are tight but after the first wash and dry , they fit perfect and NEVER slide off , ordered a second pack
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 24, 2026
★★★★★ 5
Comfortable, Durable, and Stylish
Perfect gift choice! Excellent quality socks with a variety of colors to match any wardrobe.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 30, 2025
★★★★★ 5
Great fit
Size: Medium, Color: White
Perfect fit and they don't slide off the back of your ankle.
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Reviewed in the United States on March 16, 2026
★★★★★ 5
Best socks!
Size: Medium, Color: Blue
I love these socks! They last for years and they fit so nicely on my feet. I love that I can wear the in tennis shoes or wool boots and they never move!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 21, 2025
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