BBI 448004 SAE Tension Flat Washer, 5/16 in, 0.339 - 0.349 in ID x 0.681 - 0.703 in OD, 0.056 - 0.071 in THK
BBI Tension Flat Washer, SAE, Series: IMPERIAL L9®, 5/16 in Nominal Size, 0.339 - 0.349 in Inside Dia, 0.681 - 0.703 in Outside Dia, 0.056 - 0.071 in Thickness, 15N 82-85 Hardness, Carbon Steel, Zinc Yellow