量针 921 量针是一种测量螺纹中径的工具。符合JB标准。级 别尺寸偏差圆度公差μ m0 ±0.250.251 ±0.50.5 编 号级 别量 针 直 径921-010;10.118,0.142,0.185,0.250,0.291, 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