16
 
 
 
 
 
 
 
 
2698
2158
2161
2171
2173
2180
Use the 2161 “tight cinching” 18 mm 
in applications where the block 
needs to be secured extremely 
close to the deck. 
Part
No.
Description
Sheave
Ø
Length
Weight
Max line
Ø
Maximum
working load
Breaking
load
in
mm
in
mm
oz
g
in
mm
lb
kg
lb
kg
 2158 
 18 mm double 
 23/32 
 18 
 1 3/32 
 28 
 .6 
 17 
 3/16 
 5 
 450 
 204 
 1500 
 680 
 2161 
 18 mm single/narrow 
 23/32 
 18 
 1 3/32 
 28 
 .25 
 7.2 
 3/16 
 5 
 275 
 125 
 992 
 450 
 2171 
 29 mm single *
 1 1/8 
 29 
 1 3/4 
 44 
 .92 
 26 
 9/32 
 7 
 770 
 350 
 1540 
 700 
 2173 
 40 mm single *
 1 9/16 
 40 
 2 5/16 
 58 
 2.2 
 62.2 
 11/32 
 9 
 1435 
 650 
 2870 
 1300 
 2180 
 18 mm triple 
 23/32 
 18 
 1 3/32 
 28 
 1 
 28.4 
 3/16 
 5 
 600 
 272 
 1100 
 499 
 2698 
 18 mm single 
 23/32 
 18 
 1 3/32 
 28 
 .25 
 7.2 
 3/16 
 5 
 275 
 125 
 992 
 450 
Fly Blocks 
Harken soft-attach Fly blocks are designed to provide strength without 
mass, providing sailors with big power in a low-aero package. Designed 
specifically for high-tech line, these efficient blocks have an incredible 
working load for their small size. Fly blocks are perfect for use on foiling 
dinghies and sportboats and for vang cascades and backstay systems on 
Grand-Prix racers.
18 mm
18 mm blocks feature an integrated stainless steel inner race and rivet, 
stainless steel ball bearings, and composite fiber-reinforced sideplates.
29 & 40 mm
29 and 40 mm blocks feature a one-piece titanium outer race/sheave, 
stainless steel ball bearings and inner race, and composite 
fiber-reinforced sideplates.
*Lashing line not included.
Fly Blocks

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