[請益] 螺栓英制標註問題
有一個英制標註如下:
左 2 條 1/2 × 3 - 10UNC - 1 × 1 1/2 正規 半加工 六角螺栓
請問一下 3是代表甚麼?? 1 1/2又是代表甚麼??
這個標註
我查了機械設計(SPOTT SHIGLEY UGURAL MOTT)
機件原理(全華 龍騰 華興)
BS 1768-1963 統一精密六角螺栓、螺釘和螺母(UNC與UNF螺紋)規範
ANSI/ASTM B18.5
都沒看到這個標註
不知是否有高手可以解答
順便告訴我出處嗎??
感謝感謝
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