M6-1 X 45 Square-Neck Carriage Bolt 304 Stainless Steel DIN603 (2000pcs/Pkg) Weight-Pound:50.2 or conical washers

or conical washers

Countersunk serrated lock washers feature a unique design that provides a secure grip and prevents loosening under vibration

while the nylon insert grips the threads of the bolt

Commonly used in construction

They come in various sizes and are commonly used in automotive and construction applications for enhanced stability and support

M6-1 X 45 Square-Neck Carriage Bolt 304 Stainless Steel DIN603 (2000pcs/Pkg) Weight-Pound:50.2 or conical washersUSS flat washers are larger than standard flat washers, designed to distribute load over a wider area. They are commonly used in heavy duty applications, such as construction and machinery, to enhance stability and prevent damage to surfaces.