インチねじの山数からピッチを算出する方法は？ | オーエスジー

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
Pitch = 16 peaks (16 peaks in 1 inch)
25.4÷16=1.5875mm
・ Thread type = UNC = Unified parallel
(UNC = Parallel Eyes, UNF = Fine Eyes, Extremely Fine Eyes = UNEF, etc.) ）
The thread angle is 60°.

(FAQID:294)