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Is it possible to share G, PF, and tools?
Tools such as taps, threaded round dies, and other machining tools can be shared.
However, the gauge must be as instructed in the drawing.
This is because the dimensional tolerance on the gauge side, not the screw, is different, and the pass/fail judgment may differ between G and PF gauges.
Positional relationship between PF3/8-19(A) and G3/8-19 thread gauge effective diameters
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Difference in dimensional tolerance of each part of the screw gauge between PF3/8-19(A) and G3/8-19
| Conventional JIS PF A class | Current JIS G | ||
| Street side GP |
Gauge Outer Diameter | 16.662 | |
| Outer diameter tolerance | +8～+24μm | -5～+15μm | |
| Pitch Tolerance | ±4μm | ±５μm | |
| Half-width error of the mountain | ±14 min | ±13 min | |
| Stoppage WP/IP/NP |
Gauge Outer Diameter | 16.36 | 16.203 |
| Outer diameter tolerance | Typical Values | ±10μm | |
| Pitch Tolerance | ±4μm | ±５μm | |
| Half-width error of the mountain | ±18 min | ±16 min | |