.531 x 2.0 x .108 Extra Heavy Fender Washers Zinc 5/16-18 057-09 while the 5 1/2 refers

while the 5 1/2 refers to the length of the bolt

45 DIN 934 Metric Hex Nuts are made of 18-8 stainless steel

It is made from durable steel and has a zinc coating for added corrosion resistance

The M16 x 90 DIN 931 10

Its plain center design allows for easy installation without the need for a washer

.531 x 2.0 x .108 Extra Heavy Fender Washers Zinc 5/16-18 057-09 while the 5 1/2 refersThese Extra Heavy Fender Washers are made from durable zinc and are designed to provide a large bearing surface for bolts and screws. They are ideal for use in high stress applications where a strong and reliable connection is required. The washers have a thickness of 0. 108 inches, a width of 2. 0 inches, and a hole diameter of 0. 531 inches. They are sold in packs of 100 and are backed by a satisfaction guarantee.