
Internal & External Thread BS EN 148-1:1999 (Rd 40 x 1/7)
grabcad
A European Respirator Standard Spins a Global Design Challenge. This Thread Limit Model May Adapt to Gas Mask Needs. Based on BS EN 148-1:1999, A British Standard Emerges. The Rd 40 x 1/7 Thread Designation Holds the Key. Original Question Seeks Help for German Police, Now Available Here: https://grabcad.com/questions/corona-need-help-for-german-police
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