量针 921
量针是一种测量螺纹中径的工具。符合jb标准。
尺寸偏差
0.118,0.142,0.185,0.250,0.291, 0.343, 0.433,0.511,0.572,0.742,0.796,0.866, 1.008,1.157,1.302,1.441,1.553,1.732, 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