68
3299
3300
3301
3302
3303
3405
Sideplate rotates open allowing 
rigged line to be loaded into block.
High-Load Snatch Blocks
These multipurpose blocks are a must on racing yachts of all sizes. Opening sideplates 
make them easy to deploy, allowing crew to quickly fasten them whenever needed — 
perfect for temporary leads, line deflection, and static line functions requiring small 
adjustments. A strop soft-attach is fixed on one side, but is easily removable on the other. 
The strop carries the block’s primary load and articulates for a fair lead. The hook-and-loop 
strap is permanently attached to one sideplate and holds the block securely closed when 
sideplates are aligned — even under the highest loads. The strap has a broad reflective 
tab for easier operation with gloves.
Harken composite bearing technology (ULC) ensures sheaves turn smoothly and maintain 
efficiency under extreme loading. Snap-fit Torlon® bearings carry sideloads. An integral 
headspacer prevents Hard Lube-anodized aluminum sideplates from deflecting and 
binding. The wide sheave allows a range of line diameters.
One Ton Twing Block
The new Twing block features a spring-loaded side-opening mechanism for true one-handed 
rigging, even while wearing sailing gloves. Black anodized aluminum sideplates are edged 
with robust bumpers to protect the block, topsides, and deck. The sheave is aluminum 
rolling on a bearing system shared with Harken’s existing 2.3T high-load snatch block.  
Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
A fixed hook-and-loop strap keeps side-
plates aligned and securely closed under 
high loads.
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
3405
1T Twing block
1 1/2
38.5
3.0
78
1.4
143
.43
11
2205
1000
4409
2000
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
 3299 
 2.3T snatch 
 1 1/2 
 38.5 
 2 1/2 
 63 
 2.9 
 84 
 7/16 
 11 
 5069 
 2300 
 10138 
 4600 
 3300 
 5T snatch 
 2 1/5
 56 
 3 2/5
 86 
 8.9 
 252 
 5/8 
 16 
 11020 
 5000 
 22040 
 10000 
 3301 
 8T snatch 
 3 
 75 
 4 1/2 
 114 
 17.6 
 498 
 3/4 
 18 
 17632 
 8000 
 35264 
 16000 
 3302 
 12T snatch 
 4 
 101 
 5 4/5 
 148 
 36.7
 1041 
 1 3/16 
 30 
 26448 
 12000 
 52896 
 24000 
 3303 
 15T snatch 
 4 9/10 
 125 
 6 9/10
 175 
 58.3
 1654 
 1 3/16 
 30 
 33060 
 15000 
 66120 
 30000 

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