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Since it represents the number of mountains between 1 inch (= 25.4 mm), the pitch conversion (mm) can be calculated by dividing 25.4 by the number of mountains.

▽ Unified Screw Representation
Since the unit of measurement is inches, it needs to be converted to millimeters.
Calculated as 1 inch = 25.4 mm.

For 3/8-16 UNC,
・Outer diameter = 3/8
25.4×3/8＝9.525mm
Pitc

There are two types of camera release screws: parallel screws and tapered screws. Both Tap (M3.4x0.5) are special.

gauge is also a special product, but the external thread is only a tapered screw, and the taper (slope angle of 14°) is too strong to produce a ring gauge .

The figure below shows the positional relationship between the tolerances of each effective diameter in thread accuracy and thread gauge accuracy.

Positional relationship between thread accuracy and thread gauge accuracy M6×1 6H, 5H, 2nd class

Interpretation of the amount of force when using screw gauge _screwing by hand without strain

Regarding the use of screw gauge , JIS (JIS B 0251) describ

There is no stop, and the symbol J is entered gauge

The notation "J" for thread precision is the standard thread gauge .

As with the screw limit gauge

I have a PT gauge , can I use it as a Rc gauge ?

Sharing is not allowed.

gauge If you do not use a product that meets the stan

What to do if you can't get your ring gauge off 

One of the reasons why it can't be removed is that the gauge is stuck at an angle.

It is better to hit them lightly with a plastic hammer

gauge inspection of internal threads for pipes ~ What is the gauge to inspect the internal thread of RP1/4? ~

The gauge measuring the internal thread of Rp1/4 uses a tapered plug gauge of R.

gauge determines the "fi