... - M20 3. Material: stainless steel 200, 201, 304 or 316 Hex Nut1. Standard: DIN934, DIN439, ANSI, GB52, GB6170, GB6175, GB6172, JISB118, etc ... Taiwan, together with precise moulds and punch pins;6. Thickness: standard, thin, thick (heavy) or extra thick;7. Other names: Hexagon ...