90
A
B
80% B
A
B
A
B
C
2103, 2110
2117, 2124
2131, 2132
2108, 2115 
2122, 2126
2109, 2116
2123, 2127
A
B
A
C
B
A
B
2107
2104, 2111
2118
2106
2105, 2112
2119, 2125
072
138
246.PAIR
2761
1584
A
111 
112
A
A
B
463
093, 1598,
9050
B
A
Number on shackle denotes screw 
diameter in millimeters.
The breaking strengths 
shown are derived from 
tests that supported 80% 
of the length of 
the screw pin that is 
unsupported, which 
is similar to the area 
of a post in a block.
Maximum working 
loads are no more 
than half the minimum 
breaking strength.
High-resistance shackles are 
marked “HR”.
Stainless Steel
Shackles
Forged
Stainless steel shackles used on Harken blocks are available separately. 
Multiple configurations and sizes.
Stamped Shackles
The 072, 138, 246.PAIR, and 2761 shackles are used on most of the 
 Small Boat blocks. They are also useful for a range of other applications.
Snap Shackles
The 111, 112, and 1584 snap shackles fit a variety of blocks and make them 
removable. Many use a snap shackle on the lower vang block so that it can be 
moved from the mastbase to the toerail for use as a preventer.
U-Adaptors
The 093 U-Adaptor allows blocks with 10 mm (3/8") posts to be attached to 
swivel bases or to other blocks with 10 mm (3/8") posts.
The 1598 U-Adaptor allows blocks with up to 15 mm (19/32") posts to be 
attached to swivel bases or to other blocks with 15 mm (19/32") posts.
The 463 U-Adaptor adapts 75 mm Carbo singles to swivel bases.
The 9050 U-adaptor allows 57/75 mm Carbo blocks to be attached to 
170 Hexa-Cat Base or other blocks with 12.7 mm (1/2") posts and 
6.35 mm (1/4") pins.
Load
Bow
Captive Halyard
Twist
U-Adaptors attach blocks to swivel 
bases or to other blocks.
DO NOT use Harken equipment for human suspension unless product is specifically certified and labeled for such use.
FORGED SHACKLES
SNAP SHACKLES
STAMPED SHACKLES
U-ADAPTORS

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