Harken 57mm Carbo Ratchamatic 7:1 Low-Profile Mainsheet System

Murrays Part# 28-71

The Harken 7:1 Mainsheet System includes a 57mm Triple Carbo Ratchamatic Base with 40mm Carbo single (Harken #HSB360) added on to it and a 57mm Triple with becket boom block (Harken #2605);  By adding the 40mm Carbo single to the base block we have turned this into a low profile 7:1 Mainsheet system.  line is not included. Safe working load is 1500 pounds; breaking strength is 3750 pounds.

The 7:1 Mainsheet System can be used on the Hobie 18, Hobie 20, Hobie 21 SC and SE, Prindle 19, Nacra 5.8, 6.0, 6.0NA, and Tornado.

**Snap Shackle, spring, traveler and mainsheet line not included. 

Maximum line diameter is 10mm or 3/8". We recommend Dacron Spun Braid as a economy mainsheet line and Pro Racing Sheet as a premium mainsheet line.

Harken Description: Lightweight, low profile and very strong, these Carbo AirBlocks® have enormous working range, with a higher working load than standard blocks, even though they are lighter in weight! The Carbo Ratchmatic® 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 the sheet runs freely during mark roundings and jibes. Ratchet engagement may be adjusted to a higher or lower load according to strength and sailing style. Holding power of 57 mm is as high as 10:1.