... metal slitting saw 锯割刨刀 threads per inch 牙数 progressive blanking 持续下料加工 ...
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trapezium 是指梯形；TPI是指 threads per inch（ 每英寸螺纹数）；1英寸=2.54厘米；下战书帮你问一下学机械的同窗，这个应该是说的一个螺帽的尺寸。
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Standards agreed upon parameters such as the size and shape of electrical outlets, the number of threads per inch on machine bolts, or the tolerances allowed for various medical tests may seem arcane or abstract.
WHITEHOUSE: Office of Science and Technology Policy Blog
Henceforth someone trying to build an engine could pluck a standard 8-gauge, 32-threads-per-inch machine screw off the shelf.
FORBES: Architect of Life
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