M30 Hex Bolt Nut Washers High Tensile 8.8 Zinc DIN931 – Fixaball Ltd. Fixings and Fasteners UK
Metric M2-M30 All Sizes Hexagon Full Nuts Hex Nut for Screw Bolts - Carbon Steel | eBay
Metric Nylon Insert Nuts ZP. Standard Pitch Various sizes from M3 - M3 – Bescol DIY
Wrench size - Wikipedia
M6 Nut (Pack of 25) Stainless Steel Hexagon Locking Nuts for Bolts/Screws – Metal Metalic with Coarse Thread - Certified Standard DIN EN 24032 DIN934 6mm : Amazon.co.uk: DIY & Tools
M30 x 2.0mm (pitch) Hexagon Full Nuts, Grade 8 Metric Fine Pitch Thread, Yellow Zinc Plated – DIN 934 | Bolt World