Unified Miniature Thread ANSI/ASME B1.10-1958

n April 1955, representatives from the UK, Canada and the USA agreed on a miniature thread standard. The measurements for the Unified Miniature thread has been defined with reference to the ISO standard. Unlike most metric Screws, the designation consists of the diameter of the screw in millimeters followed by UNM.
The flank angle is 60°.

Thread Size mm Major Diameter mm Pitch mm TPI
0.30 UNM 0.30 0.080 317.50
0.35 UNM 0.35 0.090 282.22
0.40 UNM 0.40 0.100 254.00
0.45 UNM 0.45 0.100 254.00
0.50 UNM 0.50 0,125 203.20
0.55 UNM 0.55 0.125 203.20
0.60 UNM 0.60 0.150 169.33
0.70 UNM 0.70 0.175 145.14
0.80 UNM 0.80 0.200 127.00
0.90 UNM 0.90 0.225 112.89
1.00 UNM 1.00 0.250 101.60
1.10 UNM 1.10 0.250 101.60
1.20 UNM 1.20 0.250 101.60
1.40 UNM 1.40 0.300 84.67