SS ISO 9974-4 Ed. 2 (2017)現行
Connections For General Use And Fluid Power - Ports And Stud Ends With Iso 261 Threads With Elastomeric Or Metal-To-Metal Sealing - Part 4: Dimensions, Design, Test Methods And Requirements For External Hex And Internal Hex Port Plugs (Iso 9974-4:2016, Idt)
出版：Standardiserings-Kommissionen I Sverige
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