K2 Hexagon flange nut with serration - M10

The K2 hexagon flange nut with serration is an M10 nut to DIN 6923, used with K2's M10 T-Bolt 28/15 and other M10 fixings across the InsertionRail and SolidRail mounting systems. Its integral flange spreads the clamping load over a wider bearing area than a standard nut, and the serrated underside bites into the mating surface to resist loosening under vibration, without needing a separate washer. It is made from A2 stainless steel and has a 15mm width across flats for a standard spanner or socket. At 11g each, it is supplied in packs of 100, and is one of the standard M10 fixings used throughout K2's pitched-roof rail systems. K2's SolidHook/SolidRail assembly instructions list article 1000042 by name as the M10 nut paired with the T-Bolt 28/15 in that system.