ねじ・ゲージ | オーエスジー

Tapered threaded plug gauges for pipes have a difference in the number of notches.

R is 2 stages, PT is 1 stage.

[Difference in tapered thread gauge for pipes < plug >]

When inspecting a screw, what should you do if the GO stops and the NOT-GO passes, contrary to normal?

In that case, the screw judgment will fail.

The NOT-GO gauge has a low chevron to check only the single effective diameter.
If the NOT-

What is Pitch? What is a lead?

Pitch is the distance measured parallel to the axis between two points corresponding to adjacent chevrons in the shaft cross-section of the screw.

It is represented by P, and 1.5P refers to 1.5 pitches.

The lead is the distance between the beginning and end positions of the thread (parallel to the axis) when the thread is ro

Sewing Screw (SM) JIS B 0226

The thread angle is 60 degrees.

Accuracy is 1, 2 and 3 grades, and size is inch size

e.g. SM1/8-44 SM1/4-40

There are standard products of taps and gauges.

Standard Yamagata

The limit gauge for insert screws is the limit gauge for inserting inserts (helisate).
HL-LG is a unique symbol for OSG. The limit gauge is a set of GO and one on the stop side.

The difference from a normal thread gauge is that the plug gauge for insert screws is indicated with an H in the circle after the size .

The use of screw gauges is determined by JIS standards. Use the gauge of the thread type in the drawing instructions and inspect the screw in a determined manner. Tapered screws for pipes (PT, R, Rc, Rp) used for piping, etc., are screwed into the gauge until the screw stops, and if the pipe end of the screw to be inspected is within the range of the maximum and minimum notches, it is judged that