推荐回答（1个）
螺纹尺寸计算方式如下：
普通螺纹的基本尺寸计算:由设计确定的螺纹最基本的尺寸是公称直径^和螺距L关于公称直径，国家标准 已系列化，每一公称直径螺距最大的一种称为粗牙普通螺纹（第三 系列除外），其余几种都为细牙普通螺纹。国家标准规定普通螺纹的牙型角为60°
理论上计算方法是； 螺纹减去（螺距乘以0.865）。假设 M16*2.0 mm螺纹。螺纹内孔就是 16-（2.0*0.865)=14.27 这个是公制螺纹算法。
简单理解一点就就是。 我们知道公制螺纹是等边三角形，其实螺纹内孔就是求这个等边三角形的高。等边三角形的高的计算公式边长除以2乘以根号3以上是公制螺纹计算方法。
英制螺纹是等腰三角形，顶角55度。要换算出底边。在求出高。然后根据以上公式计算。假设 由英制换算公制圆16*2.0mm 螺纹 (2.0mm螺纹底边长度）螺纹内孔就是 16-（2.0*0.917)=14.166 。
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