NAS Flat washers are used on military applications and ID and OD are tighter in size. 18-8 Stainless steel are corrosion resistant in fresh or rain water.
Product Specification:NAS Flat WasherInside Diameter: #6, Max 0.143 - Min 0.133Outside Diameter: Max 0.267 - Min 0.257Thickness: Max 0.032 - Min 0.026NAS - National Aerospace StandardsIFI Tolerances Apply
#6 NAS flat washers,stainless steel flat washer,nuts,bolts,fasteners,18-8 stainless steel
#6 NAS Flat Washers, ID .143, OD .267, TK .032, 18-8 Stainless Steel - Qty-250