Grade 8 nylon insert lock nuts made from carbon steel with yellow zinc plating and a purple nylon collar. Flange head design provides 360° locking to resist loosening from vibration and helps seal coarse USS threads against corrosion for easier removal.

Grade 8 nylon insert lock nuts in carbon steel with yellow zinc finish and fine SAE threads. A molded nylon collar provides 360° locking to resist loosening from vibration and seals threads to reduce corrosion. Usable from -65 °F to 250 °F for heavy-duty assemblies.

Grade C Ultra-Lock reversible lock nuts made from heat‑treated carbon steel with a yellow dichromate finish. Double‑indent prevailing torque design resists vibration loosening and maintains locking torque through multiple installations. Suitable for high‑strength assemblies.

Grade C Ultra‑Lock reversible lock nuts made from heat‑treated carbon steel with yellow dichromate finish. Double indent prevailing torque design resists vibration and provides repeatable locking torque.

Nylon insert flange lock nuts made from heat-treated carbon steel for Grade 8 performance. Yellow zinc plated finish with coarse USS threads and integral flange. Nylon insert provides prevailing torque to resist loosening and improve joint reliability in high-strength assemblies. Made in the U.S.A.