SKU: 54405608364

Harken 40mm Twing Block

Sale price$69.61 Regular price$77.35
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Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Aug 4 - Aug 9

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Description

Harken 40mm Twing Block40mm Twing Block Low friction Carbo Air blocks are lightweight, strong, reliableand affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming. Features: Opening side plate Easy to rig and remove from sheet Spring biased to open when unlatched One handed operation Roller at pivot base Use 1: 1 or 2: 1 up down control Carbo Air block construction High strength for

40mm Twing Block

Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming.

Features:

  • Opening side plate - Easy to rig and remove from sheet
  • Spring biased to open when unlatched - One-handed operation
  • Roller at pivot base - Use 1:1 or 2:1 up-down control
  • Carbo Air® block construction - High strength for durability and lightweight for maximum float in light air

Uses:

  • Dinghies, sport boats, and small keelboats
  • Spinnaker sheet and guy control
  • Code zero sheet up-down control

Specifications:

  • Sheave Ø (mm): 40 mm
  • Sheave Ø (in): 1-9/16 in
  • Length (mm): 89 mm
  • Length (in): 3-1/2 in
  • Weight (g): 86 g
  • Weight (oz): 3 oz
  • Maximum line Ø (mm): 12 mm
  • Maximum line Ø (in): 3/8 in
  • Maximum working load (kg): 275 kg
  • Maximum working load (lb): 606 lb
  • Breaking load (kg): 825 kg
  • Breaking load (lb): 1818 lb

Owner's Manual (pdf)
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: 54405608364

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4.9 ★★★★★
Based on 10 reviews
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Product Reviews
K
Verified Purchase
Ken B.
Lexington, US
★★★★★ 5
Man cave +1
Style: 4-Tier Shelf Brackets, Hardware Only.
Nice add to the man cave
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 28, 2026
F
Verified Purchase
ForrestA
Battle Creek, US
★★★★★ 4
Nice and Simple - but big
Style: 4-Tier Shelf Brackets, Hardware Only.
Nice product, very simple in reality. All screws together. Shelves are probably 12inches high - higher than I wanted so I won't be using it after all - but that is my fault for not realizing how vertically spaced the shelves would be. The unit takes up a lot of vertical wall space. My only dislike (hence the -1 rating) is the large stamped letters on every wall mounting plate. The letters don't appear to mean anything, and are very large and upraised - to me they detract from the overall appearance of the unit. The letters are not possible to get rid of without a grinder or significant file-work and repainting everything (not worth the significant effort that would entail).
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 25, 2025
C
Verified Purchase
CLIIP. Strength & Conditioning
Pawtucket, US
★★★★★ 5
Great shelving!
Style: 4-Tier Shelf Brackets, Hardware Only.
Love this product
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 19, 2026
O
Verified Purchase
orestes o.
Phoenix, US
★★★★★ 1
Demasiado pesado
Style: 4-Tier Shelf Brackets, Hardware Only.
No me gustó , además de ser muy complejo para armar , es demasiado pesado , es para paredes bien fuerte ya que requiere muchos tornillos
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Reviewed in the United States on December 28, 2025
S
Verified Purchase
s.wkan
Bozeman, US
★★★★★ 5
Love these shelves
Style: 4-Tier Shelf Brackets with 3 Boards-24in
Highly recommend these shelves. So easy to put together and they are sturdy and look great. I’m considering buying a second one!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 19, 2025

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