Threaded Plug Gauges

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Threaded plug gauges, also known as thread plug gauges or simply plugs, are precision tools designed for inspecting internal threads. They work by using Go and No-Go members to verify thread compatibility. A smooth rotation without resistance indicates the thread is within the specified tolerance. Each gauge is clearly marked with its nominal size and type, and unless specified, they are right-handed.

Threaded Plug Gauges - Unified Inch Threads

Threaded Plug Gauges - Metric Threads

Threaded Set Plug Gauges - Unified Inch Threads

Threaded Set Plug Gauges - Metric Threads