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DFARS Specialty Metals
Ring Gauges for Outside Diameters
Check the outside diameter of shafts, rods, and other cylindrical objects to determine whether they’re in tolerance.
If your part can pass through a go gauge but cannot pass through a no-go gauge, it is within tolerance.
Go gauges check the maximum outside diameter.
No-go gauges check the minimum outside diameter.
| Choose a Size | Increment | Surface Smoothness (RMS), microinch | Hardness | Material | Gauge Tolerance | Each | |
Go Gauges | |||||||
|---|---|---|---|---|---|---|---|
Class Z | |||||||
| 0.1501" to 0.2400" | 0.0001" | 8 | Rockwell C60 | Tool Steel | -0.0001" to 0" | 0000000 | 0000000 |
| 0.2401" to 0.3650" | 0.0001" | 8 | Rockwell C60 | Tool Steel | -0.0001" to 0" | 0000000 | 000000 |
| 0.3651" to 0.5100" | 0.0001" | 8 | Rockwell C60 | Tool Steel | -0.0001" to 0" | 0000000 | 000000 |
| 0.5101" to 0.8250" | 0.0001" | 8 | Rockwell C60 | Tool Steel | -0.0001" to 0" | 0000000 | 000000 |
| 0.8251" to 1.1350" | 0.0001" | 8 | Rockwell C60 | Tool Steel | -0.00012" to 0" | 0000000 | 000000 |
| 1.1351" to 1.5100" | 0.0001" | 8 | Rockwell C60 | Tool Steel | -0.00012" to 0" | 0000000 | 000000 |
| 1.5101" to 2.0100" | 0.0001" | 8 | Rockwell C60 | Tool Steel | -0.00016" to 0" | 0000000 | 000000 |
| 2.0101" to 2.5100" | 0.0001" | 8 | Rockwell C60 | Tool Steel | -0.00016" to 0" | 0000000 | 000000 |
No-Go Gauges | |||||||
Class Z | |||||||
| 0.1501" to 0.2400" | 0.0001" | 8 | Rockwell C60 | Tool Steel | 0" to 0.0001" | 0000000 | 000000 |
| 0.2401" to 0.3650" | 0.0001" | 8 | Rockwell C60 | Tool Steel | 0" to 0.0001" | 0000000 | 000000 |
| 0.3651" to 0.5100" | 0.0001" | 8 | Rockwell C60 | Tool Steel | 0" to 0.0001" | 0000000 | 000000 |
| 0.5101" to 0.8250" | 0.0001" | 8 | Rockwell C60 | Tool Steel | 0" to 0.0001" | 0000000 | 000000 |
| 0.8251" to 1.1350" | 0.0001" | 8 | Rockwell C60 | Tool Steel | 0" to 0.00012" | 0000000 | 000000 |
| 1.1351" to 1.5100" | 0.0001" | 8 | Rockwell C60 | Tool Steel | 0" to 0.00012" | 0000000 | 000000 |
| 1.5101" to 2.0100" | 0.0001" | 8 | Rockwell C60 | Tool Steel | 0" to 0.00016" | 0000000 | 000000 |
| 2.0101" to 2.5100" | 0.0001" | 8 | Rockwell C60 | Tool Steel | 0" to 0.00016" | 0000000 | 000000 |
Master Ring Gauges
Set inside micrometers, dial bore gauges, and other precision tools.
| Choose a Size | Increment | Gauge Tolerance | Surface Smoothness (RMS), microinch | Hardness | Material | Each | |
Class Z | |||||||
|---|---|---|---|---|---|---|---|
| 0.1501" to 0.2400" | 0.0001" | -0.00005" to 0.00005" | 8 | Rockwell C60 | Tool Steel | 0000000 | 0000000 |
| 0.2401" to 0.3650" | 0.0001" | -0.00005" to 0.00005" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
| 0.3650" to 0.5100" | 0.0001" | -0.00005" to 0.00005" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
| 0.5101" to 0.8250" | 0.0001" | -0.00005" to 0.00005" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
| 0.8251" to 1.1350" | 0.0001" | -0.00006" to 0.00006" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
| 1.1351" to 1.5100" | 0.0001" | -0.00006" to 0.00006" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
| 1.5101" to 2.0100" | 0.0001" | -0.00008" to 0.00008" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |
| 2.0101" to 2.5100" | 0.0001" | -0.00008" to 0.00008" | 8 | Rockwell C60 | Tool Steel | 0000000 | 000000 |