Page 23 - Harken

NEW 431, HSB534
Small Boat 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 Block pivots around the line axis
automatically engage a ratchet mechanism as loads increase, giving sailors a to keep line entry height low.
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.

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.
Contact Harken for more information.
2142 2143 2144 2145
2678 2679 2688 2689

Sheave Max line Maximum Breaking
Part Ø Width Length Height Weight Ø working load load
No. Description in mm in mm in mm in mm oz g in mm lb kg lb kg
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
*Maximum working loads and breaking loads for blocks based on cam strengths.
Dinghy Vang

The dinghy vang features 16 mm sheaves with stainless ball bearing for high loads.
The assembly includes a 468 Micro Cam-Matic cleat that allows precise trimming.
®
It’s easy to cleat because it pivots for a fair lead. The unit connects to a mast bracket
with a 1/4" pin. The system provides a 12:1 purchase when cascaded with 4:1 blocks.
The vang lower unit is available by itself or as part of a kit, which includes a 16 mm
double block cascaded to a Micro single with becket for the vang purchase, plus a
Micro single for attaching the cunningham.

Max Maximum Breaking
Part Weight sail area working load load
No. Description oz g ft² m² lb kg lb kg
431 Dinghy vang kit 10.3 291 125 11.6 400 181 1000 454
HSB534 Dinghy vang lower unit* 8.1 229 125 11.6 400 181 1000 454 HSB534
*Order your own line, 406, and 225 blocks to complete system.
33