SKU: 14264066813

Ronstan Series 40 All Purpose Block - Double Block - Full Swivel Head [RF41200]

$49.86 $55.40
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Description

Ronstan Series 40 All Purpose Block - Double Block - Full Swivel Head [RF41200]Series 40 All Purpose Block Double Block Full Swivel Head 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. Head swivels freely. Features: Exceptionally

Series 40 All Purpose Block - Double Block - Full Swivel Head


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. Head swivels freely.

Features:

  • Exceptionally high working loads
  • Low maintenance, long service life
  • Self-lubricating sheave
  • Slotted pin shackle eliminates fouled lines
  • Two way head post

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")
  • Pin Ø: 5mm(3/16")
  • M.W.L.: 600kg(1,320lbs)
  • B. L.: 1,200kg(2,650lbs)
  • Weight: 135g(4.8oz)
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: 14264066813

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4.6 ★★★★★
Based on 13 reviews
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Eyedoc314
Lake Worth, US
★★★★★ 5
Delightful and thought-provoking!
Format: Audiobook
Absolutely delightful and thought-provoking Audio book, read by Tyson himself. (An excellent companion volume to Hegseth’s “Take me to Your Liter”. )
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026
S
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SA
Louisville, US
★★★★★ 5
Quick read, entertaining & informative
Format: Hardcover
This book can be enjoyed on several levels. It could be tongue-in-cheek or satire, but is also backed by facts and conjecture by one of the world’s greatest scientific thinkers. I think Dr. Tyson had fun writing it, and i certainly had fun reading it. And I learned a lot.
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Reviewed in the United States on May 29, 2026
P
Verified Purchase
Probably did
Phoenix, US
★★★★★ 5
Aliens: Know what to expect!
Format: Audiobook
This is a really fun review of Earth's obsession with alien life, what we have historically expected of aliens--and what they might expect of us. If you are a long-time listener of the author or a viewer of his YouTube show (Star Talk), you have probably heard much of what NDT has to say on this subject already--here and there as he picks his way thru the universe, but why not listen to him now again as he focuses his energies on just this alien subject? If you want an enjoyable read, it will be worth your time. If you're not a long-time listener of NDT... and you have any interest in aliens at all, then you DEFINITELY should give this book a go. It is full of thoughtful insights from a man who has devoted his life to the science and 'cultural impact' of the stars. I listened to the Audible version wherein NDT reads his own book aloud for you. His efforts really allow you to gain his insights... And his strong sense of humor--in equal doses. 5 Stars
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Reviewed in the United States on May 12, 2026
T
Verified Purchase
Taylor
Draper, US
★★★★★ 5
My son is actually motivated to do a workbook
Format: Paperback
My Kindergartener finished homeschool online early and we have been doing a page a day and he loves it and loves to earn a sticker after each day and put it on his chart. I love how engaging the workbook is and how it introduces some 1st grade concepts. Would highly recommend.
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Reviewed in the United States on January 23, 2026
A
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Amazon Customer
Birmingham, US
★★★★★ 5
Excellent Kindergarten prep
Format: Paperback
My daughter is loving all of the learning exercises and has started feeling more confident heading in to Kindergarten.
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Reviewed in the United States on May 20, 2026

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