Harken's Carbo AirBlocks® are 60% stronger and 30% lighter than Classic blocks. The nylon-resin sideplates are densely packed with long glass fibers for a compact block with a high strength-to-weight ratio. Sheaves spin on high-load ball bearings with fitted races for low-friction operation. Ball bearings, sheave, and sideplates are UV-stablized for maximum protection.
The high-load 57mm Carbo has a broad working range. Use for main and jib sheets on centerboard and small keelboats, and for mainsheet systems on catamarans. Other uses include mainsheet fine-tune, control lines, vangs, cunninghams, and outhauls.
Swivel blocks can lock in two directions or spin freely to avoid lines twisting.
|Sheave Diameter||2 1/4 in||57 mm|
|Max Line Diameter||7/16 in||10 mm|
|Max Working Load||1,584 lb||720 kg|
|Breaking Load||3,300 lb||1,500 kg|
|Shackle Pin Diameter||N/A||6 mm|
|Weight w/ Shackle||6.6 oz||187 g|
|Length||5 5/8 in||142 mm|