sigh007 发表于 2012-3-31 17:53:37

MIL-S-21472C


                   MIL-S-21472C, MILITARY SPECIFICATION SCREW, SHOULDER, HEXAGON SOCKET-HEAD AND SLOTTED-HEAD GENERAL SPECIFICATION FOR (31 OCT 1988)  .,  This specification covers hexagaon slotted-head  shoulder screws and socket-head  shoulder screws         
         
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