Specification for screwed studs - general purpose studs 双头螺栓.第1部分:通用双头螺拴
2.
Asa b1 . 12 5 specification for screwed studs - recommendations for high grade studs with class 5 interference fit threads to american standard asa b1 . 12 双头螺栓规范.第2部分:高级双头螺拴