Fastenal 4153-031: 3/8"-16 Astm A563 Grade a Plain Finish Steel Jam Nut
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Carbon-steel, Grade A, plain-finish hex jam nut with a full coarse 3/8"-16 right-hand thread. Meets ASME B18.2.2 and ASTM A563 standards; 9/16" wrench size, 0.210"-0.227" nut thickness, and 0.551"-0.562" head width. Jam nuts are tightened against a work surface, with a finished or heavy hex nut tightened against the jam nut to help prevent loosening.
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