Harken 2634 57mm Carbo Double Ratchamatic Block - Swivel

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.

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

Use the 2634 with a 402 or 403 swivel arm for a versatile two-speed mainsheet system.

Specifications:

• Sheave Ø (mm) - 57 mm

• Length (mm) - 116 mm

• Weight (g) - 204 g

• Shackle pin Ø (mm) - 6 mm

• Maximum line Ø (mm) - 10 mm

• Maximum working load (kg) - 340 kg

• Breaking load (kg) - 851 kg

• Holding power w/180 degree wrap 50 lb (23 kg) - 10:1