M4-0.7 Flange Hex Nut 304/A2 Stainless Steel DIN6923 10000pcs/Pack Weight-Pound:27.1 have a domed head that

have a domed head that protects screws and bolts from stripping

Acorn nuts

making them ideal for applications requiring vibration resistance

USS flat washers are larger than standard flat washers

Split lock washers are designed with a split or gap that creates tension when compressed

M4-0.7 Flange Hex Nut 304/A2 Stainless Steel DIN6923 10000pcs/Pack Weight-Pound:27.1 have a domed head thatFlange nuts feature a washer like base that distributes pressure over a larger area, helping to keep fasteners secure. Theyre often used in manufacturing assembly lines to speed up operations by combining the ftions of a nut and washer.