G80 Unilock Shackle Connecting Link in grade 80. The nut must be tightened so that the bolt can still move - and must not be over-tightened. Used as a G80 Uni-Lock Shackle eg. between master link and chain, hook or various eye bolts.
U-Lock Shackle Grade 80 to BS EN1677-1
Safety Factor 4:1
Mainly used in the logging industry