英语翻译The1/2" - 14 NPT threadings must allow the handtight engagement of the taper pipe thread plug gage from 8 mm to 9mm(with number of engaged threads between L1 and L1+1)括号里的L1和L1 +1 是什么?螺纹规?

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英语翻译The1/2

英语翻译The1/2" - 14 NPT threadings must allow the handtight engagement of the taper pipe thread plug gage from 8 mm to 9mm(with number of engaged threads between L1 and L1+1)括号里的L1和L1 +1 是什么?螺纹规?
英语翻译
The1/2" - 14 NPT threadings must allow the handtight engagement of the taper pipe thread plug gage from 8 mm to 9mm(with number of engaged threads between L1 and L1+1)
括号里的L1和L1 +1 是什么?螺纹规?

英语翻译The1/2" - 14 NPT threadings must allow the handtight engagement of the taper pipe thread plug gage from 8 mm to 9mm(with number of engaged threads between L1 and L1+1)括号里的L1和L1 +1 是什么?螺纹规?
L1是 螺纹倒角长度,L1表示一个螺距+1 就是2个