... NPTF Thread Ring Gauges Dear Sir , NPT Thread Ring Gauge NPTF Thread Plug Gauge ... PLAIN GAUGES, TAPER, METRIC, UNC, UNF, BSP, BSW, BSPT , BA & ALSO GAUGES AS PER YR DRG & DIMNS. ... WE ARE ALSO MANUFACTURING HARDENED , GROUND AND LAPPED MEASURING PINS IN (SET & LOOSE) RANGE ... Including of The Metric Plug and Ring Gauges, American Plug and Ring Gauges, PlainPlug and Ring Gauges, Petroleum Tubing ...