M4 Belleville Washer 316 Stainless Steel DIN6796 (10000pcs/Pkg) Weight-Pound:6.6 have a domed head that

have a domed head that protects screws and bolts from stripping

and industrial uses

making them ideal for applications requiring vibration resistance

to enhance stability

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

M4 Belleville Washer 316 Stainless Steel DIN6796 (10000pcs/Pkg) Weight-Pound:6.6 have a domed head thatBelleville washers, or conical washers, provide a unique spring action that compensates for bolt relaxation and thermal expansion. They maintain consistent pressure in assemblies, absorb shock, and prevent loosening in high vibration applications, making them ideal for automotive, aerospace, and industrial uses.