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Ships within 48 hours · Estimated delivery Jul 24 - Jul 29
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For Your Every Summer RSVP, with Code: SUMMER15
Description
Ronstan Series 40 All Purpose Block - Single - CheekSeries 40 All Purpose Block Single Cheek 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
Series 40 All Purpose Block - Single - CheekAll 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.
Features:
- Exceptionally high working loads
- Low maintenance, long service life
- Self-lubricating sheave
- Mount with 3 x 5mm (3/16") fasteners (not supplied)
Applications:
- Mainsheet
- Halyard
- Vang
- Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8M(26')
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 load strap and head fitting
Specifications:
Sheave Ø: 40mm(1-9/16")
Max. Rope Ø: 10mm(7/16")
M.W.L.: 400kg(880lbs)
B. L.: 1,000kg(2,200lbs)
Weight: 66g(2.3oz)
Manufacturer : Ronstan
Manufacturer Part No : RF41151
UPC : 9316800244331
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
4.0 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 5
Great Shirt for WOMEN
Color: All White, Size: Medium
Fantastic Shirt for Women! I'm 5'9" 150 lbs and ordered a medium. Its form fitting, stretchy and feels great! No Wrinkles
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 12, 2026
★★★★★ 5
Love the fit
Color: All White, Size: Small
I always feel like shirts are a little too baggy but this one does for incredibly nice. The material is really light feeling too. Definitely will buy more of these shirts
Edit: I’ve bought multiple of these shirts and they’re absolutely amazing. They’re also comfy and really good for the summer. There was a review that mentioned to avoid this shirt because they iron it. This shirt is nylon and spandex. I don’t understand why you would expose it to high heat like that especially knowing high heat can damage certain type of material. If you need to iron it, make sure your iron can adjust to those two fabric settings or take it to a place that professionally can do that.
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Reviewed in the United States on January 23, 2025
★★★★★ 4
Good shirt, but not perfect
I have bought three of these shirts. They fit well, look good, good value for the price, don't wrinkle easily. The fabric is VERY heavy and does not breathe well, so they are better suited for winter than summer wear. The placket tends to bunch up when you're seated, so wearing an undershirt can be helpful.
The only thing I'd change about it is the fastener on top would be better as a standard button, or be fastened closer to the shirt. When worn buttoned-up, there's enough room between the two halves of the shirt that one side folds down and there's an unnecessary collar gap that doesn't look great. When worn unbuttoned, the fastener dangles (which again, doesn't look great). The shirt also doesn't have collar stays, so the collar can roll up.
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Reviewed in the United States on April 27, 2026
★★★★★ 3
Heavy shirt
Color: All White, Size: Small
Looks good but is heavy, not like a traditional long sleeve shirt, I always use long sleeve shirts every day, but this one is heavy comparing with the other ones that I have
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Reviewed in the United States on February 6, 2025
★★★★★ 5
Great fit
Color: All White, Size: Medium
Love the fit for my son
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 2, 2026
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