Code : Taper Thread Gauges
Brand : Kuroda
Taper thread ring gauges and taper thread plug gauges are used to check whether a taper external (pipe) and a taper internal thread (pipe joint) which have been screw-cut for pipe connection can archieve a satisfactory fit.
When the taper thread gauge is fitted in the taper thread being inspected by hand-tightening, i will always stop.
It is possible to judge the dimensional accuracy of the thread in a comprehensive manner by checking the gauge stop pasition to measure the axial gauge travel.
The gauge is manufactured to have a notch equal to the axial permissible size of the taper thread being inspected. Therefore, it is possible to easily judge the quality of the taper thread by checking whether the pipe end position of the thread stops between the notches or not.
R gauges, PT gauges, NPT gauges, NPTF gauges, etc. are manufactured in accordance with this system.
In addition, taper thread gauges for the fixing scres of high-pressure gas vessels and valves are also manufactured in accordance with this sytem.
Other specific gauge systems are available on request.
R Gauges and PT gauges
An R gauge consists of a thread plug gauge, a thread ring gauge and a check plug gauge used to check thread ring gauges.
Wear check for a thread plug gauge is performed by measurement, and wear check for a thread ring gauge is performed by using its check plug gauge.
For wear limit, refer to JIS B 0253.
PT gauge consists of a thread plug gauge and a thread ring gauge.
Wear check is generally performed by using a set of newly manufactured gauges which have been stored as a master gauge to check for dimensional changed of displacement af the small end.
