Gauge Type Diameter Range Thread Plug Gauges. 1.6mm - 300 mm Thread Ring Gauges. 2mm - 260mm Plain Plugs to check Minor Diameter of Internal Threads 1.6mm - 300mm Plain Rings to check Major Diameter of External Threads. 1.5mm - 300mm

Thread plug gages are used to check tolerances of internal threaded (tapped) holes of parts according to your required specification. They are metrology tools whose purpose is to gauge the inside diameters of holes that have been tapped or machined into a manufactured part, component, or assembly.

NOMINAL SIZE GO BASIC; ALL CLASSES; ALL SERIES CL. 2B CL. 3B X TOL. GO =+; NO #0 ‑ 80 UNF .0519 .0542 .0536 .0002 #1 ‑ 64 UNC .0629 .0655 .0648 .0002 #1 ‑ 72 UNF .0640 .0665 .0659 .0002

Baker Gauges Pvt. Ltd. Pune India is the best Manufacturer and suppliers of Special Thread Gauges, Thread Plug Gauges, Thread Pitch Gauge and Thread Ring Gauge.

Standard practice for plug gauges is to assign a plus tolerance of 5% of the product hole tolerance to the go gauge and a minus 5% tolerance to the no-go gauge, for a total of 10% tolerance band. Plug gauge configurations and material options Plug gauges come in several styles or configurations making them suitable for different uses.

Thread Limit Plug Gauge (ISO-Compliant JIS Standard Specification) GPNP Essential instrument for checking thread accuracy. Thread gauge enabling easy checking 

a) Thread plug gauge (GO and NO-GO): A thread plug gauge is used to check acceptance of a "nut" - i.e. an internally threaded part. For small threaded parts, the gauge will be double ended, with one end carrying the GO gauge and the other end, the NO-GO. For large parts, the two may be separate pieces.

Thread setting plugs have the same pitch diameters as the adjustable thread rings they set/inspect. The setting plug gages will have a go pitch diameter that is larger than the no-go pitch diameter. If someone used a truncated setting plug to inspect internal product threads, they would produce 100% scrap.

The pipe taper thread ring gauges are cut at the reference path position and screwed into the stop position to determine whether the size meets the standard 

Out of Business and/or Sold Screw Thread Gage Makers Part 3: Specification for gauges for screw threads of ISO metric form 

Threads are described by the major diameter of the thread followed by the number of threads per inch (TPI). 1/4-20: .250" basic major diameter with 20 TPI Each Machine Screw Number = .013" larger than .060". #0 tap = .060 + .000 = .060" major diameter #1 tap = .060 + .013 = .073" major diameter #2 tap = .073 + .013 = .086" major diameter