Chain Size Iso G30 Proof Coil

Width Length
Chain size Diameter
A
Outer
B
Inner
C
Outer
D
Pitch
E
mm in mm in mm in mm in mm in
3/16in 5.5 0.217 10.0 0.394 24.6 0.969
1/4in 7.0 0.276 12.7 0.500 25.4 1.000
5/16in 8.4 0.331 12.7 0.500 28.5 1.122
3/8in 10.0 0.394 15.8 0.622 31.0 1.220
1/2in 13.0 0.512 20.6 0.811 38.0 1.496

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