This standard was last reviewed and confirmed in 2019. Therefore this version remains current.
ISO 12257:2008 specifies the dimensions of metric internal six-lobe drives used in metric screws in nominal thread diameter range 3 mm to 20 mm.
Status: PublishedPublication date: 2008-08
Edition: 1Number of pages: 2
Technical Committee: ISO/TC 20/SC 4 Aerospace fastener systems
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