Harken's Carbo Ratchamatic® Blocks are load-sensing blocks that roll freely in both directions under low loads and automatically engage the ratchet as loads increase, making shifting between ratchet and light-air modes seamless. Unloaded main and jib sheets run out freely during mark roundings and asymmetrical spinnakers free instantly during jibes.
Ratchet engagement may be adjusted to a higher or lower load according to strength and sailing style. The 57mm Ratchamatic® provides up to a 10:1 holding power.
The patented switch locks shackle in front or side positions, or lets block swivel to keep line from twisting. The eight-faceted, hard lube-anodizing aluminum sheave holds line securely.
|Sheave Diameter||2 1/4 in||57 mm|
|Max Line Diameter||3/8 in||10 mm|
|Max Working Load*||300 lb||136 kg|
|Breaking Load*||750 lb||340 kg|
|Holding Power w/ 180° Wrap||10:1||10:1|
|Shackle Pin Diameter||3/16 in||5 mm|
|Weight w/ Shackle||9.4 oz||266 g|
|Length||4 1/16 in||103 mm|
*MAXIMUM WORKING LOADS AND BREAKING LOADS FOR BLOCKS BASED ON CAM STRENGTHS