
 
					 
				  
				NPT thread plug gauges & ring gauges 
Ring gages used to check external thread, plug gages used to check internal thread. 
 
NPT thread gauges, the full name is National Pipe Taper thread gauges(full name:American National Standard Taper Pipe Thread gages) 
 
NPT threads used on threaded pipes and pipe fittings, they are tapered for sealing, no need any thread sealant. 
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