Specifies the shape and basic dimensions of hexalobular internal driving feature for bolts and screws including the gauging method. Also specifies the curvature of the contour of the internal driving feature.
SANS 1700-9-5:2008 history
0000 SANS 1700-9-5-2008
2003SANS 1700-9-5:2003 Fasteners Part 9: Hexagon socket head screws Section 5: Hexalobular internal driving feature for bolts and screws