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Harken Ratchamatic Carbo Blocks

Harken

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.

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

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Ratchamatic Blocks (Imperial)
Code Part No. Description Sheave Dia.
 (in)
Length
(in)
Weight
(oz)
Shackle pin Dia.
(in)
Max Line Dia.
(in)
Maximum Working Load
(lb)
Breaking Load
(lb)
Holding power w/180° wrap 50 lb (23 kg)
57 mm
HAR2625 2625 Single 2 1/4 4 1/16 3.7 3/16 3/8 500 2000 10:1
HAR2626 2626 Single/becket 2 1/4 4 15/16 4 3/16 3/8 500 2000 10:1
HAR2627 2627 Single/150 Cam-Matic* 2 1/4 4 1/16 9.4 3/16 3/8 300 750 10:1
HAR2628 2628 Single/150 Cam-Matic/becket** 2 1/4 4 15/16 9.7 3/16 3/8 600 1500 10:1
HAR2629 2629 Triple/150 Cam-Matic* 2 1/4 4 1/16 14.9 1/4 3/8 1500 3750 10:1
HAR2630 2630 Triple/150 Cam-Matic/becket* 2 1/4 4 15/16 15.2 1/4 3/8 1800 4500 10:1
HAR2632 2632 Triple/150 Cam-Matic/40 mm block/becket 2 1/4 6 1/8 18.3 1/4 3/8 1800 4500 10:1
HAR2633 2633 Cheek* 2 1/4 3 1/4 3.1   3/8 500 2000 10:1
HAR2634 2634 Double 2 1/4 4 9/16 7.2 1/4 3/8 750 1875 10:1
75 mm
HAR2680 2680 Single 2 15/16 5 3/8 8.4 1/4 7/16 750 3000 15:1
HAR2681 2681 Single/becket 2 15/16 6 1/2 9 1/4 7/16 750 3000 15:1
HAR2682 2682 Cheek* 2 15/16 4 1/16 6.5   7/16 750 3000 15:1
HAR2683 2683 Single/150 Cam-Matic** 2 15/16 5 7/16 15.5 1/4 7/16 300 750 15:1
HAR2684 2684 Single/150 Cam-Matic/becket** 2 15/16 6 1/2 15.5 1/4 7/16 600 1500 15:1
HAR2685 2685 Triple/150 Cam-Matic* 2 15/16 6 3/16 31 5/16 7/16 1500 3750 15:1
HAR2686 2686 Triple/150 Cam-Matic/becket* 2 15/16 6 1/2 31.6 5/16 7/16 1800 4500 15:1
HAR2687 2687 Triple/150 Cam-Matic/57 mm block/becket* 2 15/16 6 1/2 34.7 5/16 7/16 1800 4500 15:1
*Maximum working loads for blocks based on cam strenghts.

Ratchamatic Blocks (Metric)
Code Part No. Description Sheave Dia.
 (mm)
Length
(mm)
Weight
(g)
Shackle pin Dia.
(mm)
Max Line Dia.
(mm)
Maximum Working Load
(kg)
Breaking Load
(kg)
Holding power w/180° wrap 50 lb (23 kg)
57 mm
HAR2625 2625 Single 57 103 104 5 10 227 907 10:1
HAR2626 2626 Single/becket 57 125 113 5 10 227 907 10:1
HAR2627 2627 Single/150 Cam-Matic* 57 103 266 5 10 136 340 10:1
HAR2628 2628 Single/150 Cam-Matic/becket** 57 125 275 5 10 272 680 10:1
HAR2629 2629 Triple/150 Cam-Matic* 57 103 421 6 10 680 1700 10:1
HAR2630 2630 Triple/150 Cam-Matic/becket* 57 125 431 6 10 816 2041 10:1
HAR2632 2632 Triple/150 Cam-Matic/40 mm block/becket 57 156 520 6 10 816 2041 10:1
HAR2633 2633 Cheek* 57 83 89   10 227 907 10:1
HAR2634 2634 Double 57 116 204 6 10 340 851 10:1
75 mm
HAR2680 2680 Single 75 137 238 6 12 341 1361 15:1
HAR2681 2681 Single/becket 75 165 255 6 12 341 1361 15:1
HAR2682 2682 Cheek* 75 103 184   12 341 1361 15:1
HAR2683 2683 Single/150 Cam-Matic** 75 138 440 6 12 136 340 15:1
HAR2684 2684 Single/150 Cam-Matic/becket** 75 165 440 6 12 272 680 15:1
HAR2685 2685 Triple/150 Cam-Matic* 75 137 879 8 12 680 1700 15:1
HAR2686 2686 Triple/150 Cam-Matic/becket* 75 165 896 8 12 816 2041 15:1
HAR2687 2687 Triple/150 Cam-Matic/57 mm block/becket* 75 165 984 8 12 816 2041 15:1
*Maximum working loads for blocks based on cam strenghts.

Harken Ratchamatic Carbo Blocks

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