Cap Screws 5/16"-18 X 2" Hex Head Steel USA Three radial lines 120 degrees apart and manufacturer ID Grade 5 Steel Cadmium Plated Yellow MS90725, DFARS MI003
Steel Hex Nut, Cadmium Plated Finish, Grade 8, Mil. Spec. MS51968, 5/16"-24 Thread Size, 1/2" Width Across Flats, 17/64" Thick (Pack of 25): Amazon.com: Industrial & Scientific
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ASTM A307 Grade B bolts and nuts | SA 307 gr c Threaded Rod/ Stud Bolt