Converting Metric to Standard
From Faq
I would like to thank Steve at Highland Lighting for letting me use his conversion chart. It helps when you just can't find that right sized tool for that important job you are working on. Remember to be careful when using tools that are even the littlest bit off. It may lead to stripping or damaging your gear, tools, or body parts.
Conversion (1" = 25.4mm , 1mm = 0.0394") :
millimeter decimal inch closest fractional inch
5mm 0.20" 1/5"
6mm 0.24" 1/4"
8mm 0.31" 5/16"
10mm 0.39" between 3/8 & 7/16"
12mm 0.47" between 7/16 & 1/2"
14mm 0.55" between 1/2 & 9/16"
16mm 0.63" 5/8"
18mm 0.71" between 5/8 & 3/4"
20mm 0.79" between 3/4 & 13/16"
22mm 0.87" 7/8"
24mm 0.95" between 15/16 & 1"
25mm 0.98" hair under 1"
26mm 1.02" hair over 1"
28mm 1.10" 1-1/8"
30mm 1.18" 1-3/16"
32mm 1.26" 1-1/4"
34mm 1.34" 1-1/3"
35mm 1.38" 1-3/8"
36mm 1.42" 1-7/16"
38mm 1.50" 1-1/2"
40mm 1.57" 1-9/16"
45mm 1.77" 1-3/4"
49mm 1.93" 1-15/16"
50mm 1.97" 2"
55mm 2.16" 2-1/8"
60mm 2.36" 2-1/3"
63mm 2.48" 2-1/2"
65mm 2.56" 2-9/16"
67mm 2.64" 2-5/8"
80mm 3.15" 3-1/8"
90mm 3.54" 3-1/2"
100mm 3.94" 4"
110mm 4.33" 4-1/3"
120mm 4.72" 4-3/4"
1000mm(1 meter) 39.37" 39-3/8"
Thread Reference:
IP = International Pipe Standard
M = Male (external thread)
F = Female (internal thread)
Threading Diameter in Inches, approx Notes
4-36 3/32" the size of socket keys
8/32 5/32"
1/4-27 1/4" most common for lamp finials
1/8 IP 3/8" allows wire pass-through
1/4 IP 1/2"
3/8 IP 5/8" for heavy mounts
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Wire Gauge Reference: (American Wire Standard, not to be confused with the British standard)
Gauge Size in inches
6/0 .5800"
5/0 .5165"
4/0 .4600"
3/0 .4096"
2/0 .3648"
1/0 .3249"
1 .2893"
2 .2576"
3 .2294"
4 .2043"
5 .1819"
6 .1620"
7 .1443"
8 .1285"
9 .1144"
10 .1018"
11 .0907"
12 .0808"
13 .0719"
14 .0640"
15 .0570"
16 .0508"
17 .0452"
18 .0403"
19 .0358"
20 .0319"
21 .0284"
22 .0253"
23 .0225"
24 .0201"
25 .0179"
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