5/16 (100 Pack) Grade 8 Lock Washer, Split, Thru-Hardened, Yellow Zinc by Makers Bolt Size: for 5/16 fasteners | Inside diameter: 0.318 | Outside diameter: max 0.593 | Thickness: min 0.078 100 split lock washers per package Grade 8 high strength thru-hardened steel Yellow zinc plated for moderate corrosion resistance ASME B18.21.1 Compliant UPC 810074743280 ASIN B0D65XGGV3 Brand MAKERS BOLT Color Yellow Set Name 5/16 (100 Pack) Grade 8 Lock Washer, Split, Thru-Hardened, Yellow Zinc Size Name 5/16 (100 pack) Metal Type Alloy Steel Unit Count 100 Count Part Number 31SLWHY100 Thread Size 5/16 Washer Type Split Lock Finish Types Zinc Grade Rating Grade 8 Manufacturer Makers Bolt Fastener Size 5/16 Fastener Type Split Lock Washer Item Diameter 0.59 inches Material Type Alloy Steel Item Thickness 0.08 inches Exterior Finish Zinc Number Of Items 100 Number of Pieces 100 Outside Diameter 0.59 inches Washer Application General Engineering, Heavy-Duty, Outdoor Washer Compatibility 5/16 fasteners Compatible Groove Diameter 0.32 inches