NAAMS Hardened Washers

Freer Tool & Supply’s NAAMS hardened washers collection supports stronger, more reliable bolted joints in welding, assembly, and automation tooling. Hardened washers help distribute load, protect mounting surfaces, and reduce galling or deformation under clamping force—making them a critical component for fixtures and base assemblies where repeatability and long-term durability matter.

F62 series NAAMS hardened washers are heat treated to Rc 38-45 for sizes M6 to M10, while M12 and larger conform to ASTM F436M dimensional and material standards. Washer inner diameters range from 7.0 mm to 39.0 mm, outer diameters from 12.6 mm to 70.1 mm, and thicknesses from 2.7 mm to 3.4 mm.