5/16 Inch Grade 8 Split Lock Washer Pack Thru Hardened Steel With Yellow Zinc Plating 0.318 Inch Inner Diameter 0.593 Inch Outer Diameter 0.078 Inch Thickness 100 Count For 5/16 Fasteners ASME B18.21.1 Compliant Makers Bolt

5/16 Grade 8 Split Lock Washer, Thru Hardened Steel
✔️ 0.318 in ID / 0.593 in OD / 0.078 in thick; 100 pcs

These split lock washers are built for 5/16" fasteners, made from Grade 8 thru-hardened steel with yellow zinc plating for moderate corrosion resistance, and are ASME B18.21.1 compliant. They’re commonly used in automotive, industrial equipment, and machinery assemblies where reliable vibration resistance is needed.

✅ Size: fits 5/16 in fasteners; ID 0.318 in (8.07 mm)
✅ Outer diameter 0.593 in (15.06 mm) and thickness 0.078 in (1.98 mm)
✅ 100 count per pack; Grade 8 thru-hardened steel with yellow zinc plating; ASME B18.21.1 compliant

💡 What is a lock washer used for in mechanical assemblies?

This handy component helps prevent fastener loosening and maintains preload under vibration.

• Helps keep joints tight in cars, equipment, and industrial setups
• Works with standard 5/16 in fasteners and thru hardened steel
• Yellow zinc plating adds corrosion resistance for outdoor use