L-Gauges
Identify bolts with ease! These thread gauges will help you easily determine the diameter and thread pitch of external thread and have a built in ruler for measuring length as well.
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US Thread Gauge
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Metric Thread Gauge
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Click on one of the images for larger versions.
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Diameters:
1/4", 5/16", 3/8", 7/16", 5/8", 3/4", 7/8", 1" |
Diameters:
4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm |
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Thread Counts:
28, 24, 20, 18, 16, 14, 13, 12, 11, 10, 9, 7, 6, 5, 4-1/2 |
Thread Pitches:
0.8, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6 |