90.20 Standard under periodical review Jul 15, 2024
ISO
ISO/TC 20/SC 4 Aerospace fastener systems
International Standard
49.030.20 Bolts, screws, studs
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.
PUBLISHED
ISO 12257:2008
90.20
Standard under periodical review
Jul 15, 2024