BMW 11mm Hex-Head Flange/Collar Nut M7x1.00mm 11617545279 New Genuine | eBay
U.S. / Inch - Hex Serrated Flange Nuts, Stainless Steel 18-8 (A2)
KIPP - Hexagon nuts with flange EN 1661
100pcs) DIN 6331 M8 Hexagon Collar Nuts, Height 1,5 d A4 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP633148: Amazon.com: Industrial & Scientific