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Harken 40mm Twing Block [2699]

Harken 40mm Twing Block [2699]

Regular price $74.00 USD
Regular price Sale price $74.00 USD
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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.


  • 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


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


  • 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)
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