US to Metric Conversion Table

US-Metric Conversion Table for Fasteners

Length Conversion

US Units (Inches)	Metric Equivalent (Millimeters)
1/64 inch	0.3969 millimeters (mm)
1/32 inch	0.7938 millimeters (mm)
1/16 inch	1.5875 millimeters (mm)
3/32 inch	2.38125 millimeters (mm)
1/8 inch	3.175 millimeters (mm)
5/32 inch	3.96875 millimeters (mm)
3/16 inch	4.7625 millimeters (mm)
7/32 inch	5.55625 millimeters (mm)
1/4 inch	6.35 millimeters (mm)
5/16 inch	7.9375 millimeters (mm)
3/8 inch	9.525 millimeters (mm)
7/16 inch	11.1125 millimeters (mm)
1/2 inch	12.7 millimeters (mm)
9/16 inch	14.2875 millimeters (mm)
5/8 inch	15.875 millimeters (mm)
11/16 inch	17.4625 millimeters (mm)
3/4 inch	19.05 millimeters (mm)
13/16 inch	20.6375 millimeters (mm)
7/8 inch	22.225 millimeters (mm)
15/16 inch	23.8125 millimeters (mm)
1 inch	25.4 millimeters (mm)
1 1/8 inch	28.575 millimeters (mm)
1 1/4 inch	31.75 millimeters (mm)
1 3/8 inch	34.925 millimeters (mm)
1 1/2 inch	38.1 millimeters (mm)
1 5/8 inch	41.275 millimeters (mm)
1 3/4 inch	44.45 millimeters (mm)
1 7/8 inch	47.625 millimeters (mm)
2 inches	50.8 millimeters (mm)
3 inches	76.2 millimeters (mm)
4 inches	101.6 millimeters (mm)
6 inches	152.4 millimeters (mm)
8 inches	203.2 millimeters (mm)
10 inches	254 millimeters (mm)
12 inches	304.8 millimeters (mm)
18 inches	457.2 millimeters (mm)
24 inches	609.6 millimeters (mm)
36 inches	914.4 millimeters (mm)
48 inches	1219.2 millimeters (mm)
60 inches	1524 millimeters (mm)
72 inches	1828.8 millimeters (mm)

Diameter (Gauge to Metric)

US Units (Gauge)	Metric Equivalent (Millimeters)
#0000	0.46 mm
#000	0.51 mm
#00	0.61 mm
#0	1.524 mm
#1	1.727 mm
#2	1.981 mm
#3	2.261 mm
#4	2.413 mm
#5	2.565 mm
#6	2.794 mm
#7	3.048 mm
#8	3.251 mm
#9	3.454 mm
#10	3.658 mm
#12	4.191 mm
#14	4.775 mm
#16	5.291 mm
#18	5.873 mm
#20	6.553 mm
#24	8.229 mm

Diameter (Fractional Inches to Metric)

US Units (Inches)	Metric Equivalent (Millimeters)
1/64 inch	0.3969 mm
1/32 inch	0.7938 mm
3/64 inch	1.1906 mm
1/16 inch	1.5875 mm
5/64 inch	1.9844 mm
3/32 inch	2.38125 mm
7/64 inch	2.7781 mm
1/8 inch	3.175 mm
9/64 inch	3.5719 mm
5/32 inch	3.96875 mm
11/64 inch	4.3656 mm
3/16 inch	4.7625 mm
13/64 inch	5.1594 mm
7/32 inch	5.55625 mm
15/64 inch	5.9531 mm
1/4 inch	6.35 mm
9/32 inch	7.14375 mm
5/16 inch	7.9375 mm
11/32 inch	8.73125 mm
3/8 inch	9.525 mm
13/32 inch	10.31875 mm
7/16 inch	11.1125 mm
15/32 inch	11.90625 mm
1/2 inch	12.7 mm
9/16 inch	14.2875 mm
5/8 inch	15.875 mm
11/16 inch	17.4625 mm
3/4 inch	19.05 mm
13/16 inch	20.6375 mm
7/8 inch	22.225 mm
15/16 inch	23.8125 mm
1 inch	25.4 mm
1 1/8 inch	28.575 mm
1 1/4 inch	31.75 mm
1 3/8 inch	34.925 mm
1 1/2 inch	38.1 mm
1 5/8 inch	41.275 mm
1 3/4 inch	44.45 mm
1 7/8 inch	47.625 mm
2 inches	50.8 mm
2 1/4 inches	57.15 mm
2 1/2 inches	63.5 mm
2 3/4 inches	69.85 mm
3 inches	76.2 mm
3 1/4 inches	82.55 mm
3 1/2 inches	88.9 mm
3 3/4 inches	95.25 mm
4 inches	101.6 mm

Thread Pitch

US Units (Threads Per Inch - TPI)	Metric Equivalent (Threads Per Millimeter - TPM)
80 TPI	3.175 TPM
72 TPI	2.822 TPM
64 TPI	2.54 TPM
56 TPI	2.204 TPM
48 TPI	1.905 TPM
40 TPI	1.5875 TPM
36 TPI	1.411 TPM
32 TPI	1.27 TPM
28 TPI	1.058 TPM
24 TPI	0.794 TPM
20 TPI	0.635 TPM
18 TPI	0.563 TPM
16 TPI	0.5 TPM
14 TPI	0.453 TPM
13 TPI	0.393 TPM
12 TPI	0.333 TPM
11 TPI	0.287 TPM
10 TPI	0.254 TPM
9 TPI	0.222 TPM
8 TPI	0.198 TPM
7 TPI	0.178 TPM
6 TPI	0.158 TPM
5 TPI	0.127 TPM
4 TPI	0.1016 TPM