ARP 200-8403 5/16" ID x 9/16" OD Stainless Steel Flat Washer

Not for use on cylinder heads mains or rods.This quality washer has an oversized I.D. to clear most under-bolthead radii. This washer is made of stainless steel which providesgreat resistance to corrosion.General Purpose WasherSingle PieceQuality washers for many applications, such as attachingaccessories, chassis components, etc. They are not of the hardnessrequired for use on cylinder heads, mains and connecting rods.Available in black oxide and stainless steel. Stainlessdemonstrates excellent corrosion resistance. Washers haveover-sized I.D. (inside diameter) to clear most under-bolt headradii. Available for 1/4, 5/16, 3/8, 7/16, 1/2 and 10mm shankbolts and studs.