[10 PKG] Hex Lock Nuts Nylon Insert Grade C Medium Carbon Phosphate Oil 1-3/8-12

Hex Lock Nuts Nylon Insert Grade C Medium Carbon Phosphate Oil 1-3/8-12 are precision-engineered nylon insert lock nuts designed to provide superior torque retention and vibration resistance in heavy-duty assemblies.

• Locking technology: Nylon insert creates a captive layer that increases friction and prevents loosening due to vibration and thermal cycling.
• Material: Grade C medium carbon steel for strength and durability.
• Finish: Phosphate oil coating for enhanced corrosion resistance and lubricity in demanding environments.
• Size & thread: 1-3/8-12 (inch) UNC thread, standard hex size for compatibility with common hardware.
• Configuration: Hex nut with nylon insert, designed for easy hand-tightening and dependable locking under load.

Ideal for automotive, machinery, equipment, and industrial applications where secure fasteners are critical. The combination of nylon insert and coated steel helps maintain preload under vibration, reduces maintenance, and simplifies disassembly when needed.

Installation tips: Align components, hand-tighten, then use a wrench to reach the final torque. Do not reuse damaged nylon inserts; replace if the insert shows wear or deformation to ensure optimal locking performance.