Product description

Harken 57mm Ratchmatic Carbo Triple Block with 40mm Top Block, Becket and Cam Cleat

57mm Ratchmatic Carbo Blocks

The Carbo Ratchamatic® is a load-sensing ratchet block that rolls freely in both directions under low loads and automatically engages the ratchet as loads increase. Shifting between ratchet and light-air modes is 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 Ratchamatic® cheek block mounts on either port or starboard. The holding power of the 57 mm is as high as 10:1. The 75 mm is up to 15:1.

For the ultimate system, mount a Ratchamatic® on the boom above a cockpit-mounted switchable ratchet to allow the mainsheet to run freely in light air and to double holding power in heavy air.

Use for:

• Main/Jib Sheets
• Asymmetric spinnakers

Specifications:

• Sheave Ø 57 mm
• Sheave Ø 2 1/4 in
• Length 156 mm
• Length 6-1/8 in
• Weight 520 g
• Weight 18.3 oz
• Shackle pin Ø 6 mm
• Shackle pin Ø 1/4 in
• Maximum line Ø 10 mm
• Maximum line Ø 3/8 in
• Maximum working load 816 kg
• Maximum working load 1800 lb
• Breaking load 2041 kg
• Breaking load 4500 lb
• Holding Power with 180° wrap with 50lb (23kg) 10:1
• Maximum Working Load and Breaking Load Based On Cam Cleat Strength