1 4 40 2 July 8, 2019 16 32 64 128 1 4 40 20 1 4 40 uns 2a dimensions 1 4 40 uns 2a to mm 1 4 40 8x )= 19x 2 5x 1 2 3 4 40 4 40 x 1 2 1 2a 4 )+( 40 4 8a 4 40 unc 1 2 1 4 27 40 1 4 24x 40 1 4 2x 40 1 4 40 uns 2a thread dimensions 1 4 40 uns 2b 4 1 2 40 grit flap disc
