Size & Gauge Help

Size = Inside length or inside diameter.

Gauge = The thickness of the metal.

How to Measure for Size

Inside Diameter

Inside Diameter

Inside Length in a Straight Line

Inside Length

Inside Length

Please note that sizes may not display accurately on your monitor.
Always use a household ruler to measure.

Gauge Equivalents

Gauge Inches Millimeters
0000 .460 11.684
000 .410 10.404
00 .365 9.266
0 .325 8.26
2 .257 6.54
4 .204 5.19
6 .162 4.12
8 .128 3.26
10 .102 2.59
12 .081 2.05
14 .064 1.63
16 .051 1.29
18 .040 1.02
20 .032 .812

Size Equivalents

Inches Decimal inches Millimeters
3/16″ .1875 4.8
1/4″ .250 6.4
5/16″ .3125 7.94
3/8″ .375 9.5
7/16″ .4375 11.11
1/2″ .500 12.7
9/16″ .5625 14.29
5/8″ .625 15.9
11/16″ .6875 17.46
3/4″ .750 19.0
13/16″ .8125 20.64
7/8″ .875 22.2
15/16″ .9375 23.81
1″ 1.000 25.4
1-1/4″ 1.25 31.75
1-5/16″ 1.3125 33.34
1-3/8″ 1.375 34.93
1-7/16″ 1.4375 36.51
1-1/2″ 1.5 38.1