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| ①,最小螺紋長(zhǎng)度: 螺紋的最小長(zhǎng)度應(yīng)等于螺栓基本直徑的兩倍加上0.25英寸(對(duì)于6英寸或更短的螺栓標(biāo)稱長(zhǎng)度),以及兩倍基本螺栓直徑加上0.50英寸(對(duì)于較長(zhǎng)的標(biāo)稱長(zhǎng)度)。 標(biāo)稱長(zhǎng)度太短而無(wú)法容納最小螺紋長(zhǎng)度的螺栓應(yīng)為全螺紋螺栓。從頭部或頸部到第一個(gè)完整(完整)螺紋的長(zhǎng)度不得超過(guò)2-1/2螺紋(尺寸小于等于1英寸)和3-1/2螺紋(尺寸大于1英寸)。 | 
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