Chain Size Iso G43 Hi Test Chain

Width Length
Chain size Diameter
A
Outer
B
Inner
C
Outer
D
Pitch
E
mm in mm in mm in mm in mm in
1/4in 7.0 0.276 10.4 0.410 21.3 0.839
5/16in 8.4 0.331 13.0 0.510 26.2 1.031
3/8in 10.0 0.394 15.0 0.591 31.0 1.220
7/16in 11.8 0.465 16.5 0.650 35.6 1.402
1/2in 13.0 0.512 19.3 0.760 40.3 1.588

Source: http://coxeng.co.uk/anchoring/chain/