Standard DIN 557. Material Stainless Steel.
eBay
Further details are as follows Zinc Plated BZP. Pitch - 0.5mm. Spanner Size - 5mm. Aluminium Sprocket Nuts. Aluminium Round Bar. Aluminium Square Bar. Aluminium Fasteners.
eBay
Standard DIN 934.
eBay
Fits M3 M4 Bolts and Screws. Size: M3 M4. Material: A2 Stainless Steel 304.
eBay
M3.5 Hexagon Nut A2 stainless steel M3.5 hexagon nut, manufactured to DIN 934 standards. Features 0.60mm thread pitch and 6.00mm spanner size. Corrosion-resistant and durable, ideal for mechanical, industrial, and craft applications. Compatible with bolts, screws, and washers.
eBay
A2 Hexagon Full Nut Stainless Steel DIN 934 0
eBay
Standard DIN 6923.
eBay
M3 Hexagon Nuts (DIN 934) - Bright Zinc Plated Mild Steel (Grade 8). 5mm HALF LOCK NUTS THIN HEXAGON HALF LOCK NUT A2 STAINLESS STEEL DIN 439. Hexagon steel Nuts are intended to fasten screws and bolts, when used in conjunction to unthreaded holes.
eBay