Fastenal 1137308: 1/2"-20 Grade C Zinc Finish Steel Top Lock Nut
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Steel top lock nut with a 1/2"-20 fine, full-thread configuration, zinc finish, Grade C, 0.573" thickness, and 3/4" wrench size. Meets ASME B18.16.6 and ASTM F1941/F1941M standards. Its deformed top threads create locking zones for a vibration-resistant friction fit; Grade C is equivalent to Grade 8. Sold in packages of 25.
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