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  • Conquest 1/4"-20 Grade C NE Nylon Insert Locknut - Plain
    SKU: NENILNC-14-20

    Conquest Grade C NE Nylon Insert Locknut w/Coarse Threads - Plain

    Diameters
    1/4" 5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 3/4" 7/8" 1" 1-1/8" 1-1/4" 1-1/2"
    • Self-locking fastener featuring a nylon collar that resists loosening under vibration and torque
    • Coarse threads ideal for quick assembly in softer materials
    starting at
    $0.07
    Ships today when you order in the next 5 hours .
    starting at
    $0.07
    Ships today when you order in the next 5 hours .
  • Conquest 1/4"-28 Grade C NE Nylon Insert Locknut - Plain
    SKU: NENILNC-14-28

    Conquest Grade C NE Nylon Insert Locknut w/Fine Threads - Plain

    Diameters
    1/4" 5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 3/4" 7/8" 1" 1-1/8" 1-1/4" 1-1/2"
    • Self-locking fastener featuring a nylon collar that resists loosening under vibration and torque
    • Fine threads for precision applications
    starting at
    $0.12
    Ships today when you order in the next 5 hours .
    starting at
    $0.12
    Ships today when you order in the next 5 hours .
  • Conquest 1-3/4"-5 Grade C NU Heavy Nylon Insert Locknut - Plain
    SKU: NUNILNC-134-5

    Conquest Grade C NU Heavy Nylon Insert Locknuts - Plain

    Diameters
    1-3/4" 2" 2-1/4" 2-1/2"
    • designed for large-diameter, coarse-thread bolts, making it ideal for structural and industrial use
    • Grade C classification, built for applications requiring high hardness and load resistance
    starting at
    $30.99
    Ships today when you order in the next 5 hours .
    starting at
    $30.99
    Ships today when you order in the next 5 hours .

Grade C Nylon Insert Locknuts

Built for environments where vibration can compromise critical connections, Grade C Nylon Insert Locknuts are the go-to solution for durable, non-permanent locking power. A nylon collar embedded in the nut’s threads bites down on the bolt as it’s installed, creating interference that holds firm under pressure. No backing off and no thread damage. 

These locknuts are engineered to perform in controlled, indoor conditions where corrosion is not a concern. The nylon insert delivers consistent clamping force that won’t loosen over time, making them ideal for assemblies that demand serviceability without sacrificing stability.

Engineered for High-Vibration Applications

  • HVAC units and internal ductwork support
  • Equipment frames and appliance housings
  • Factory machinery and manufacturing systems
  • Furniture, shelving, and fixture assemblies

Grade C classification means these are plain-finish steel—purpose-built for indoor environments. Not recommended for exterior or corrosive conditions.

Choose the Right Fit

  • NE - Standard Nylon Insert Locknuts: Everyday performance for general-purpose fastening.
  • NU - Heavy Nylon Insert Locknuts: Thicker, stronger, and made to hold up under tougher loads and harsher movement.

If your project demands reliability without permanent locking, these locknuts are the answer. Choose your size, torque it down, and get on with the job.

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