Tappex can manufacture most Imperial thread sizes using the external features of the nearest metric equivalent product, so design information will be the similar to that listed. Popular sizes are available from stock; other sizes are available to order in reasonable batch quantities – please contact the sales office for HELP.

Metric to Imperial Equivalents

METRIC UNC UNF BA BSW
M2 2-56 8
M2.5 4-40 3-56
M3 6
M3.5 6-32 6-40 4
M4 8-32 8-36 4
M5 10-24 10-32 2
M6 1/4-20 1/4-28 0 1/4
M8 5/16-18 5/16-24