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· 图纸里面的unf unc 分别是什么意思?是什么的缩写?统一标准螺纹 (unified thread): 由美国、英国、加拿大三国共同制订, … · 4-40 (unc)是什么意思用于螺纹中。表示公称尺寸是4(不是4英寸),大径是0. 112英寸,牙数是40个的美制粗牙螺纹。代号:粗牙系 … 4-40 unc-2b 是美国统一螺纹,内螺纹。4表示是编号是4,螺纹公称直径为0. 112英寸,2表示螺纹精度等级,b表示内螺纹,40代表螺纹牙数为每英 … 粗牙螺纹(unc)、细牙螺纹(unf)、超细牙螺纹 (unef)、特殊牙距螺纹 (uns)之间有牙形、牙齿量、适用情况的区别: 1、牙形 unc表示美国统一 … Un,unf,unc;是英寸制统一螺纹的识别 un是英文unified national的缩写,属于统一螺纹的恒定螺距系列。unf是英文unified national fine的缩 …