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Difference between machining and inspection (WP/IP vs. WR/IR)
Both are stop side screw gauges, but there is a difference in tolerance.
It is recommended to use machine work (WP / WR) at the processing site, and use inspection (IP / IR) for final inspection and acceptance between companies.
It is recommended to use machine work (WP / WR) at the processing site, and use inspection (IP / IR) for final inspection and acceptance between companies.
The machine is set a little stricter than the inspection one, and it is difficult to pass.
* P: Plug gauge (for internal thread) R: Ring gauge (for external thread)
* P: Plug gauge (for internal thread) R: Ring gauge (for external thread)
[Items with a distinction between inspection and machine work] Conventional JIS metric screws (1st grade, 2nd grade, 3rd grade), unified screws, etc.
| GP (Street Side Plug Gauge) * No distinction |
 * It is harder to pass than IP. |
|---|---|
| IP (Stop-side plug gauge for inspection) * Easier to pass than WP |
[There is no distinction between inspection and work] Current JIS metric screws (5H, 6H, 7H, etc.)
| GP (Street Side Plug Gauge) |
 There is one type of stopping side in the current JIS. No distinction |
|---|
Positional relationship between screws and screw gauges
