Hobson technical document
Washer Gauge Conversion Chart: Gauge to Inch and mm
A one-page conversion table that turns a washer gauge number into its thickness in inches and millimetres. It covers twelve gauges, from 8 to 30.
What this covers
- Gauge number
- Thickness in inches
- Thickness in mm
Applies to Cup / Finishing Washer, Disc Spring (Belleville) Washer, Load-Indicator (DTI) Washer, Flat Washer, Mudguard / Penny Washer, Round Spacer, Safety / Vibration-Lock Washer, Sealing Washer, Security Mesh Clip, Spring Washer, Square Washer, Structural Washer and 2 more.
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Gauges listed: 8, 9, 10, 12, 14, 16, 18, 19, 20, 21, 22 and 30. A higher gauge number means a thinner washer.
- Gauge 8 is 0.1570" (3.988mm) and gauge 10 is 0.1250" (3.175mm).
- Gauge 12 is 0.0991" (2.517mm), gauge 14 is 0.0785" (1.994mm) and gauge 16 is 0.0625" (1.588mm).
- Gauge 18 is 0.0495" (1.257mm) and gauge 20 is 0.0350" (0.8890mm).
- The thinnest, gauge 30, is 0.0123" (0.3124mm).
Who it helps: Anyone matching a washer quoted in gauge to a thickness in mm.
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