1 4 20 unc July 8, 2019 16 32 64 128 1 4 20 unc 2b minor diameter 1 4 20 unc thread dimensions 1 4 20 unc drill size 1 4 20 unc tap drill size 1 4 20 unc 2b 1 4 20 unc screw 1 4 20 unc thread 1 4 20 unc drill size in mm 1 4 20 unc meaning 1 4 20 unc tap 1 4 20 unc pitch 1 4 20 unc to metric 1 4 20 unc nut
