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Harken 40mm Carbo Block w/ Spring and Eyestrap - Assembled HK2652
Harken 40mm Carbo Block w/ Spring and Eyestrap - Assembled
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Low-friction Carbo AirBlocks® are lightweight, strong, reliable—and affordable.These are features all sailors look for when choosing sail controls and a real breakthrough in block design. Companions to Harken’s® popular Black Magic® line, these small, compact blocks have very high working loads for safe, easy trimming no matter how hard the wind blows.

Sideplates of made of high-strength engineering resin and are UV stabilized to provide excellent protection against long-term exposure to salt water and sun. Carbo blocks are perfect for the small-diameter hard lines favored by racers. Works well for jib and mainsheet systems on high performance dinghies.

  • High Strength to Weight Ratio (manufacturer claims 30% lighter & 60% Stronger Than opposition)
  • 40mm Sheave gives a maximum line diameter of 10mm,optimum line diameter of 8mm.
  • High Load Ball Bearings allow for uses in higher load applications including control systems on small yachts
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Does this block have a ratchet setting?

No, the HK2652 does not have a ratchet setting. If you want a 40mm block with a ratchet, you'll need the HK2608 ( or HK2159 (

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