. SAE flat washers are machined to a tighter specification and have a smaller outside diameter.Flat Washer, Fits Bolt Size 3/4 in ,18-8 Stainless Steel 20 PK USS flat washers have a large, wider body.
1/4"-20 x 1-3/4 in Phillips Pan Machine Screw, Zinc Plated Steel, 50 PK Commonly used with flat or lockwashers. Machine screws are used in fastening nearly all types of hard materials..
Especially useful in metal-to-metal or where heavy duty fastening is required. Machine screws are used in fastening nearly all types of hard materials..