BS 856:1969

ISO metric, ISO inch (Unified), BSW, BSF and BA screw threads diameters 3 mm ( 1/8 in) to 20 mm (¾ in). Two forms of wing nut blank geometry; tables of dimensions for hot stamped and cast varieties and for cold forged products.Cross References:BS 21BS 84BS 93BS 919:Part 3BS 949Supplement No. 1 to BS 1157BS 1580BS 3382BS 3643:Part 1BS 3643:Part 2BS 3692 BS 4168BS 4183BS 4186BS 4190BS 4219BS 4320BS 4377BS 4439BS 4463BS 4464