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. Reversible cam arms.
|Sheave Diameter||2 1/4 in||57 mm|
|Max Line Diameter||7/16 in||10 mm|
|Max Working Load||1,500 lb||680 kg|
|Breaking Load||3,750 lb||1,700 kg|
|Shackle Pin Diameter||--||6 mm|
|Weight w/ Shackle||15.2 oz||431 g|
|Length||4 3/4 in||121 mm|
**Maximum working loads and breaking loads for blocks based on cam strengths