31
2142
2678
2181
2143
2679
2182
2183
2144
2688
2145
2689
 2181 
 2182 
 2183 
Small Boat 40, 57, & 75 mm 
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 automat-
ically 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. 
Block pivots around the line axis 
to keep line entry height low.
*Maximum working loads and breaking loads for blocks based on cam strengths.
Part
No.
Description
Sheave
Ø
Width
Length
Height
Weight
Max line
Ø
Maximum
working load
Breaking
load
in
mm
in
mm
in
mm
in
mm
oz
g
in
mm
lb
kg
lb
kg
 
 40 mm 
 1 9/16 
 40 
 1 3/4 
 43 
 3 3/16 
 81 
 2 1/8 
 54 
 1.6 
 45 
 3/8 
 10 
 300 
 136 
 750 
 340 
 
 40 mm/150 Cam-Matic* 
 1 9/16 
 40 
 2 9/16 
 66 
 3 3/16 
 81 
 3 1/2 
 87 
 7 
 200 
 3/8 
 10 
 300 
 136 
 750 
 340 
 
 40 mm/468 Micro Cam-Matic* 
 1 9/16 
 40 
 1 7/8 
 48 
 3 3/16 
 81 
 3 1/4 
 82 
 4.1 
 117 
 1/4 
 6 
200
91
400  
181  
 2142  57 mm 
 2 1/4 
 57 
 2 
 50 
 4 5/16 
 110 
 2 1/8 
 54 
 5 
 141 
 3/8 
 10 
 500 
 227 
 1584 
 718 
 2143  57 mm/150 Cam-Matic* 
 2 1/4 
 57 
 2 5/8 
 66 
 4 5/16 
 110 
 4 5/16 
 110 
 11 
 304 
 3/8 
 10 
 300 
 136 
 600 
 272 
 2144  57 mm Ratchamatic 
 2 1/4 
 57 
 2 
 50 
 4 5/16 
 110 
 2 5/8 
 66 
 5.5 
 156 
 3/8 
 10 
 500 
 227 
 1000 
 554 
 2145  57 mm Ratchamatic/150 Cam-Matic* 
 2 1/4 
 57 
 2 5/8 
 66 
 4 5/16 
 110 
 4 3/16 
 106 
 12 
 329 
 3/8 
 10 
 300 
 136 
 600 
 272 
 2678  75 mm 
 3 
 75 
 2 1/2 
 64 
 5 5/8 
 143 
 3 3/4 
 95 
 9.7 
 275 
 9/16 
 14 
 750 
 340 
 2426 
 1100 
 2679  75 mm/150 Cam-Matic* 
 3 
 75 
 2 5/8 
 66 
 5 5/8 
 143 
 5 9/16 
 141 
 17 
 485 
 9/16 
 14 
 300 
 136 
 600 
 272 
 2688  75 mm Ratchamatic 
 3 
 75 
 2 1/2 
 64 
 5 5/8 
 143 
 3 1/2 
 89 
 11 
 304 
 7/16 
 12 
 750 
 340 
 1500 
 680 
 2689  75 mm Ratchamatic/150 Cam-Matic* 
 3 
 75 
 2 5/8 
 66 
 5 5/8 
 143 
 5 3/8 
 137 
 18 
 514 
 7/16 
 12 
 300 
 136 
 600 
 272 
All 57 mm and 75 mm Ratchamatic 
blocks are also available with Power3 
sheaves which offer holding power 
options suitable for a variety of wind 
conditions. In addition, all 57 mm 
Ratchamatic blocks can be made with 
HTE (high threshold engage) sheaves 
to delay ratchet engagement, allowing 
them to run freely more of the time. 

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