Zadání
Model an M6×20 machine screw. Hex head 10 mm across flats, head height 4 mm, with a 30° chamfer around the top of the head and a washer face under it. The shank carries a true helical metric thread — 60° profile, 1.0 mm pitch, 20 mm length — ending in a 45° chamfered tip. The thread must be a real helical sweep wrapped around the shank, not decorative rings. Add a 3 mm deep hexagonal socket recess in the head.
