[100 PKG] Hex Lock Nuts NU Nylon Inserts Steel Zinc 5/16-18
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[100 PKG] Hex Lock Nuts NU Nylon Inserts Steel Zinc 5/16-18

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[100 PKG] Hex Lock Nuts NU Nylon Inserts Steel Zinc 5/16-18

Mutual ScrewSKU: 31NUBB
Price:
$19.02per 100( $0.19 each)
Pieces 100
Measurement type Inch
Thread size 5/16-18
Material Steel
Finish Zinc Plated
Head style Hex
Weight 2.0 lb

WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to https://www.P65Warnings.ca.gov.

Description

Secure, vibration-resistant fasteners for demanding assemblies. The Hex Lock Nuts NU Nylon Inserts steel zinc 5/16-18 combine a rugged steel nut, a durable zinc finish, and a built-in nylon insert that grips the bolt to prevent loosening.

Key features

  • Material: Hardened steel with a corrosion-resistant zinc plating
  • Nylon insert: Locks the threads to resist vibration and back-off
  • Size: 5/16-18 thread for compatible bolts and studs
  • Style: Standard hex nut with wrench flats for easy installation
  • NU nylon insert: Designed for reliable locking performance in a range of environments

Applications

Ideal for machinery, automotive, equipment, HVAC, and outdoor installations where vibration can cause conventional nuts to loosen. The zinc finish adds corrosion resistance for longer service life in harsh or damp environments.

Installation tips

  • Ensure bolts or studs are clean and threads are free of damage before installation
  • Hand-tighten, then use the appropriate wrench to reach your equipment’s torque specification
  • Do not reuse damaged nuts; replace if threads are stripped or the nylon insert shows wear
  • Verify that the nylon insert remains fully engaged after installation for optimal locking performance

Choose the Hex Lock Nuts NU Nylon Inserts Steel Zinc 5/16-18 for secure, reliable fastening that stays tight under vibration and over time.

Can We Help?

If you’re not sure that this product is right for you, give us a call!
800-222-0324

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