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Home > Our Brands > Harken Yacht Equipment > Blocks > Flip Flop Blocks

Harken 57mm Carbo Flip Flop Blocks



Small Boat Flip-Flop blocks pivot around the line axis to keep line close to the deck. Hinged construction allows a variety of lead angles.

Lightweight, machined 6061-T6 aluminum cheeks pivot on fiber-reinforced plastic chocks. Sheave runs exclusively on a ball bearing system for fast trim and release under any load. Ball bearings, sheave, and sideplates are UV-stabilized with carbon black for maximum protection.

Ratchamatic block versions roll freely in both directions under low loads and automatically engage a ratchet mechanism as loads increase, giving sailors a holding power of up to 15:1. The ratchet engagement can be adjusted to a higher or lower load depending on the sailor's strength, sailing style and system usage.

Reversible cam arms adjust and lock in a range of positions for crew accessibility and accommodation of changing lead angles.
Harken Micro Sailboat Blocks Technical Information

Part Nº Description Width Length Weight Maximum
Working Load
Breaking Load
in mm in mm oz g lb kg lb kg
2142 57mm Carbo 2 50 4 5/16 110 5 141 500 227 1584 718
2143 57mm / 150 Cam 2 5/8 66 4 5/16 110 11 304 300 136 600 272
2144 57mm Ratchamatic® 2 50 4 5/16 110 5.5 156 500 227 1000 554
2145 57 mm Ratchamatic®/150 Cam-Matic®*** 2 5/8 66 4 5/16 110 12 329 300 136 600 272
3122 57mm Flip-flop block** 2 1/4 57 4 3/8 111 9 255 2500 1136 5000 2273
3194 57mm Flip-flop block/lockoff** 2 1/4 57 4 3/8 111 9 255 2500 1136 5000 2273
2678 75mm Carbo 2 1/2 64 5 5/8 143 9.7 275 750 340 2426 1100
2679 75m / 150 Cam-Matic®*** 2 5/8 67 5 5/8 143 9.7 275 750 340 2426 1100
2688 75mm Ratchamatic® 2 1/2 64 5 5/8 143 11 304 750 340 1500 680
2689 75 mm Ratchamatic®/150 Cam-Matic®*** 2 5/8 67 5 5/8 143 12 18 300 136 600 680
1987 75mm Flip-flop block* 2 7/8 72 6 152 17.37 493 5000 2273 10000 4545
1989 75mm Flip-flop block/lockoff* 2 7/8 72 6 152 21.1 598 5000 2273 10000 4545
* 5/16" (8 mm) SH.
** 1/4" (6 mm) SH
*** Maximum working loads and breaking loads for blocks based on cam strengths.

Vela Sailing Supply offers you the best technical support and customer service pre- and post sale. We carry a large variety of Harken flip-flop sailboat blocks. One of the best sailboat blocks available at a very good price.


Harken Flip-Flop Sailboat Blocks at Vela Sailing Supply