![]() |
图纸螺纹标注为2-M20-6Hb40 ,那个b40 是什么意思啊? |
| |
| ||
| |
| |
Archiver|手机版|小黑屋|机械社区 ( 京ICP备10217105号-1,京ICP证050210号,浙公网安备33038202004372号 )
GMT+8, 2025-8-10 21:21 , Processed in 0.068344 second(s), 16 queries , Gzip On.
Powered by Discuz! X3.5 Licensed
© 2001-2025 Discuz! Team.