Also known as pin gauges, these Class X plug gauges are used for precision go/no-go measuring of hole sizes and depths, checking hole location and distance, and setting micrometers. All come with a certificate of accuracy traceable to NIST that states they've passed a test for accuracy.

If a go gauge can enter the hole and a no-go gauge is unable to enter, the hole is within tolerance.

Go gauges check the minimum hole diameter.

No-go gauges check the maximum hole diameter.

3D CAD models availableFor technical drawings and 3-D models, click on a part number.

Go Gauge

No-Go Gauge

Choose a Size Increment Length Surface Smoothness

(RMS), microinch Hardness Material Gauge Tolerance Each Gauge Tolerance Each

0.0040" to 0.0150" 0.0001" 2" 4 Rockwell C60 Tool Steel 0" to 0.00004" 21135A71 $28.30 -0.00004" to 0" 21135A81 $28.30

0.0151" to 0.0300" 0.0001" 2" 4 Rockwell C60 Tool Steel 0" to 0.00004" 21135A32 28.30 -0.00004" to 0" 21135A52 28.30

0.0301" to 0.0750" 0.0001" 2" 4 Rockwell C60 Tool Steel 0" to 0.00004" 21135A33 23.86 -0.00004" to 0" 21135A53 23.86

0.0751" to 0.1800" 0.0001" 2" 4 Rockwell C60 Tool Steel 0" to 0.00004" 21135A34 18.42 -0.00004" to 0" 21135A54 18.41

0.1801" to 0.2810" 0.0001" 2" 4 Rockwell C60 Tool Steel 0" to 0.00004" 21135A35 18.41 -0.00004" to 0" 21135A55 18.41

0.2811" to 0.4060" 0.0001" 2" 4 Rockwell C60 Tool Steel 0" to 0.00004" 21135A36 18.75 -0.00004" to 0" 21135A56 18.75

0.4061" to 0.5100" 0.0001" 2" 4 Rockwell C60 Tool Steel 0" to 0.00004" 21135A37 19.77 -0.00004" to 0" 21135A57 19.77

0.5101" to 0.6350" 0.0001" 2" 4 Rockwell C60 Tool Steel 0" to 0.00004" 21135A38 21.48 -0.00004" to 0" 21135A58 21.48

0.6351" to 0.7600" 0.0001" 2" 4 Rockwell C60 Tool Steel 0" to 0.00004" 21135A39 27.27 -0.00004" to 0" 21135A59 27.27

0.7601" to 0.8250"

0.8251" to 1.0100"

0.0001" 2" 4 Rockwell C60 Tool Steel 0" to 0.00004"

0" to 0.00006"

21135A41 30.00 -0.00004" to 0"

-0.00006" to 0"

21135A61 32.00