Click to expand Tap to zoom Auveco No. 19284 Vibration Proof Lock Washer 5/16" 8mm, Quantity - 25 PR by Auveco Save Liquid error (product-badge line 32): Computation results in '-Infinity'% $30.83 | / SKU 19284 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Description Catalog Description Quantity: 50 Bolt size: 5/16" or 8MM Finish: Zinc Flake Hardness: Through Hardened: 465HVI Material: Carbon Steel Outside diameter: 17/32" Used with: Grade 5, Grade 8 & ASTM 574 High Grade Bolts Country of origin: SE Catalog Click here to see item 19284 in the Auveco catalog.