Both are GO NO 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.
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)
[Items with a distinction between inspection and machine work] Former JIS metric screws (Class 1,Class 2,Class 3), unified screws, etc.
GP (GO Side Plug Gauge)
* No distinction |
![[Items with a distinction between inspection and machine work] Former JIS metric screws (Class 1,Class 2,Class 3), unified screws, etc.](/usr/file/attachment/3I4P8T2aZZZr1WZo.jpg)
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WP (GO NO-side plug gauge for work)
* It is harder to pass than IP.
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IP (GO NO-side plug gauge for inspection)
* Easier to pass than WP
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[There is no distinction between inspection and work] Current JIS metric screws (5H, 6H, 7H, etc.)
| GP (GO Side Plug Gauge) |
![[There is no distinction between inspection and work] Current JIS metric screws (5H, 6H, 7H, etc.)](/usr/file/attachment/RZj3cVXDu4M2uZBW.jpg)
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NP (GO NO-Side Plug Gauge) |
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Positional relationship between screws and screw gauges
