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There are also tolerances in the angle and pitch of the gauge , and there are minute differences on the front and back.
When the effective diameter of the external thread to be judged is close to each other (just about large), the difference may not interfere with it.
It
If you want to convert the size and pitch of the unified thread standard to millimeters, please refer to the conversion table below.
You can check the number of UNC, UNF, and UNEF piles of unified threads, as well as UN standards.
References: Refer to the Unified Thread System Conversion Table. <
BSF stands for F in BS (UK).
It corresponds to the fine line of W (thread angle 55°).
Please note that it cannot be shared with a unified thread angle of 60°.
Tap is available for special products.
(FAQID:288)
Pg screws are conduit screws in the German DIN standard, and the tool is compatible with special products.
▽ Thin steel conduit screws JIS C 8305
CTC Threads and Pg Threads
| Screw symbol | CTC | Pg |
| standard | JIS B 0204 | <
(FAQID:292)
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
(FAQID:298)
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 .
Compare the difference in effective diameter Conventional JIS and ISO ・ Screw and screw gauge ・ external thread and internal thread
The figure below shows the positional relationship between the thread accuracy, the thread and the thread gauge, external thread and
