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Imperial to Metric Comparison & Conversion Charts


Fastener Diameter & Thread


Diameter
Diameter
(Inches)
Threads Per Inch
(U.N.C.)
Pitch
(millimeters)
#00.060"80-
M1.60.063"74 (Approx)0.35 mm
#10.073"64-
M20.079"64 (Approx)0.4 mm
#20.096"56-
M2.50.098"56 (Approx)0.45 mm
#30.099"48-
#40.112"40-
M30.118"51 (Approx)0.5 mm
#50.125"40-
#60.138"32-
M40.157"36 (Approx)0.7 mm
#80.164"32-
#100.190"24-
M50.196"32 (Approx)0.8 mm
M60.236"25 (Approx)1 mm
1/4"0.250"20-
5/16"0.312"18-
M80.315"20 (Approx)1.25 mm
3/8"0.375"16-
M100.393"17 (Approx)1.5 mm
7/16"0.437"14-
M120.472"14.5 (Approx)1.75 mm
1/2"0.5"13-
M140.551"12.5 (Approx)2 mm
5/8"0.625"11-
M160.63"10 (Approx)2 mm
3/4"0.75"10-
M200.787"10 (Approx)2.5 mm
7/8"0.875"9-
M240.945"8.5 (Approx)3 mm
1"1"8-
M271.063"8.5 (Approx)3 mm

Last Updated: Dec 12, 2016
Update History:
Dec 12, 2016 by jsjohnson from Calgary Fasteners
May 16, 2016 by jsjohnson from Calgary Fasteners
May 16, 2016 by jsjohnson from Calgary Fasteners
Jan 7, 2016 by jsjohnson from Calgary Fasteners