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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
(FAQID:298)
M8×1.25 For 2nd grade,
The outer diameter of the GO gauge (GP) is +6~+18 micrometers compared to 8.
The outer diameter of the Tap varies slightly depending on the accuracy, but it is set at +60 micrometers or more, so it does not interfere.
(FAQID:202)
API gauge ( gauge for OCTG) is not a standard product.
Please give a quote to sales, including whether or not it can be manufactured.
(FAQID:207)
* The criteria for pass/fail judgment are different between the conventional JIS and the current JIS (ISO).
●Pass/fail judgment based on the current JIS (ISO)
PP GO (street): pull out through without difficulty (penetration)
PP NOT GO: Passes if neither side has more than one turn of the screw
●Conventional JIS pass/fail judgment
W
(FAQID:212)
Since the PS internal thread is a combination of PT external thread , a tapered plug gauge (PT) is used for pass/fail judgment.
However, only if the PS internal thread uses a PS external thread (now obsolete) and the PS plug gau
