Ojiyas Gauges for ANSI Taper Pipe Threads
Gauges for ANSI taper pipe threads are used to inspect general sealable parts. Various gauge specifications are used, some of which have notches. Common thread plug and ring gauges have 3 step notches (L1). If the inspected taper thread conforms to the standard dimensions, the pipe end stops at the middle notch on the gauge. The other two notches are there to indicate the maximimum and minimum allowed dimensions.
NPT National Pipe Taper
Taper pipe threads (NPT) specified in American standard (ANSI) are used to connect pipes, plumbing parts, fluid equipments and etc. Their purpose is to increase the density resistance of the threaded parts. Ojiyas Gauges for taper pipe threads (NPT) are used for measuring dimension of such threads.
NPTF National Pipe Taper Fuel and Oil
Taper pipe threads NPTF specified in American standard (ANSI) are meant for threads used to join ful or oil pipes in ships, automobiles, aircrafts and etc. These threads are designed to achieve dry seal joints without a sealing material. In NPTF threads, the density resistance of the thread parts can be obtained even without using seal compound. L1 plug and L1 ring are used to check the wrench-tight length (L3 and L2-L1) of external and internal threads. When the position of the notches of the two gauges, L1 and L3 plug, or L1 and L2 ring, tightens, it is not more than half a turn. The product's degree of taper is also guaranteed.
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Ojiyas Gauges for ANSI Taper Pipe Threads
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There are many types of gauges for taper threads with various different notches. In general, the gauges for taper threads L1 having three notches, i.e., minimum limit position ①, basic position B and maximum limit position ②, are the most commonly used. The use of the taper thread gauges has been explained in the previous pages. However, since there is a specifi cation of truncation for major and minor diameters of thread height, it is recommended to measure major and minor diameters using plain taper gauges having 6-step notches. First, the pitch diameter of the taper thread is measured with a taper thread gauge. For example, when it is judged pass at near the notch of basic position B, then for major and minor diameters, is also similar. That is the item is judged pass when the pipes can go within limit range of B. For inspection of tight tolerances, taper thread plug L3 and taper thread ring L2 are used. Refer to the following page of NPTF type threads for the detail methods of inspection.
There are many types of taper thread gauges with various different notches. In general, the taper thread gauges L1 having three notches, i.e., minimum limit position ①, basic position B and maximum limit position ②, are the most commonly used. Similar to NPT type, it is recommended to measure major and minor diameters using plain taper gauge having 6-step notches. For inspection of thread of handtight engagement, taper thread plug gauge L1 and taper thread ring gauge L1 are used for measuring the female and male threads, respectively. For inspection of thread of wrench tolerances, taper thread plug gauge L3 and taper thread ring gauge L2 are used for female and male threads, respectively.
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