This standard specifies the shape and standard dimensions of hexalobular holes (hereinafter referred to as holes) for ports and small screws, as well as the inspection method using a gauge.
JIS B 1015:2008 history
2018JIS B 1015:2018 Hexalobular internal driving feature for bolts and screws
2008JIS B 1015:2008 Hexalobular internal driving feature for bolts and screws
2001JIS B 1015:2001 Hexalobular internal driving feature for bolts and screws