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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
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
(ANSI) ANSI B1.20.1
It is a thread commonly called a parallel thread for JIS (ISO) pipes, and it is a parallel internal thread for tight coupling. （JIS B 0203）
Rp is a thread symbol used only for internal threads.
・The thread that fits into the Rp is a tapered screw for R (ISO) pipes.
・Thread angle is 55 degrees
・The name is expressed in inches,
