The fasteners you need are at GVN
GVN GÜVEN CİVATASince 1957

Washers

Washers that spread load and protect surfaces: metric flat washers (DIN 125) M3–M42, Whitworth washers 1/8"–1" in 1–3 mm thickness and body washers 1/4"–5/8". Large-diameter washers (DIN 9021) prevent crushing of wooden…

3 products

Washers that spread load and protect surfaces: metric flat washers (DIN 125) M3–M42, Whitworth washers 1/8"–1" in 1–3 mm thickness and body washers 1/4"–5/8". Large-diameter washers (DIN 9021) prevent crushing of wooden frames.