Tools such as taps, round dies, and other machining tools can be shared.
However, the gauge must follow the specifications indicated in the drawing.
This is because the tolerance applies to the gauge, not to 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 pitch diameters
Difference in dimensional tolerance of each part of the screw gauge between PF3/8-19(A) and G3/8-19
| |
Former JIS PF A class |
Current JIS G |
GO side
GP |
Gauge Outer Diameter |
16.662 |
| Outer diameter tolerance |
+8～+24μm |
-5～+15μm |
| Pitch Tolerance |
±4μm |
±５μm |
| Half-width error of the thread |
±14 min |
±13 min |
NO GO side
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 thread |
±18 min |
±16 min |
