A thread gauge is used to check the dimensions of a specific thread form angle, pitch and diameter.
Plug gauges are used to check internal threads, whereas ring gauges are used to check external threads.
Each gauge comprises of two parts: a GO gauge and a NO GO gauge. Both parts should be used to check the thread.
If you are machining a component with an external thread – you would use both a GO and a NO GO ring gauge. The GO gauge will screw on to the part. The NO GO gauge should not screw on to the part.
For a thread to be within its permissible dimensions, a GO plug gauge should screw into an internal thread and a NO GO should not screw into it.
Thread Gauges
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