量針是一種測量螺紋中徑的工具。級別：0級 尺寸偏差 0.25( m) 圓度公差0.25( m)級別：1級 尺寸偏差 0.25( m) 圓度公差0.25( m)三針/量針 尺寸:0.118,0.142,0.185,0.250,0.291, 0.433,0.511,0.572,0.742,0.796, 0.866,43008,1.457,1.302,1.441, 1.553,1.732,1.833,2.050,2.311, 2.595,2.886,3.106,3.177,3.550, 4.120,4.400,4.773,5.150,6.212