500pcs) DIN 6926 M6 Self-Locking Hexagon Flange Nuts with Serration A2 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP692626: Amazon.com: Industrial & Scientific
Mutter - Sechskantmutter - M6-10 -A4K (DIN 934) - Hochfest : Amazon.de: Auto & Motorrad