Northern Gauge is a leading manufacturer of API Thread Gauges Worldwide. We manufacture a very wide variety of Thread Gauge products such as the thread plug and ring Gauges, Plain Plug and Ring Gauges, Acme/Stub Acme Thread Gauges, NPT Thread Gauges, Metric Thread Gauges, Metric thread gauges, British thread gauges, API 5B and API 7-2 Thread Gauges as well as specialty customer designed thread gauging.