Thread Ring Gauge Specification

Standard pitch diameter chart 17 precision gages for quality assurance ring thread gages and setting plugs nominal size x tol.

Thread ring gauge specification.

Working thread plug thread ring and thread setting plug gages are manufactured to inspect the pitch diameter and the functional thread. Using the principles of go nogo gaging for external threaded parts a go thread ring gage checks the maximum minor diameter and maximum pitch diameter and a nogo thread ring gage checks that the minimum pitch diameter is not exceeded. For acceptance of the part the go ring gauge should pass through the entire length of the screw without too much use of force. Standard thread gages are made to a class x tolerance.

Threaded ring gauges for npt pipe threads with calibration certificate to ensure accuracy of npt pipe thread measurements these gauges include a certificate of calibration traceable to nist that states they ve passed a test for accuracy. Gages may be purchased individually or as assemblies. This is the minimum pitch diameter tolerance limit for i d. Section 1 classes of threads are differentiated by the amount of tolerance and allowance specified.

Ref pitch diameter go plug gage 6h tolerance pitch diameter not go plug gage 6h tolerance mm in. A thread ring gauge is designed to check the correctness of the thread to include thread depth and pitch diameter to the given pitch tpi. Thread gages are used to ensure the assembly of mating parts. Thread ring gages are adjustable and used to measure threads on an outside diameter od to ensure the threads are within its designed tolerance limits.

M series metric thread gages are manufactured per asme b1 16m. Unified inch standard gages are manufactured per asme b1 2. Indicating gaging is typically mastered at maximum material condition. Go no go unified pitch diameter go not go go not go class 2a class 3a 9 16 24 unef 5342 5303 5354 5325 0003 5 8 11 unc 5644 5589 5660 5619 0003 5 8 18 unf 5875 5828 5889 5854 0003 5.

The go gage should thread onto the part and the nogo gage should not. Ref m 1 6 x. Threads and the maximum pitch diameters tolerance limit for o d.