关于法兰是否需要车水线的问题? 一般带水线。。。 6.4.5.3 either a serrated concentric or serrated spiral finish having a resultant surface finish from 3.2 f.lm to 6.3 f.lm (125 f.lin. to 250 f.lin.) average roughness shall be furnished. the cutting tool employed should have an approximate 1.5 mm (0.06 in.) or larger radius, and there should be from 1.8 grooves/ mm through 2.2 grooves/mm (45 grooves/in. through 55 grooves/in.). 查看更多