Metric Hex (ISO)

Inch Square (UN)

hex-locknutWorld's Strongest Locknut

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Centered around our proprietary all-steel locking insert technology ,designed to last, and built in the USA for more than 50 years. The Security Locknut fastening solution delivers what you are looking for… improved performance that results in less maintenance and greater productivity! The proven and field tested design of the Security Locknut is the fastening solution that’s serving the needs of a wide range of industries throughout the world.

There are no other fastener systems that perform like those from Security Locknut. Where heavy vibration, high temperatures, or repeated removal without damaging the bolt is a concern, the Security Locknut is the product of choice.

The Security Locknut conforms to a variety of appropriate international fastening standards.

The engineering staff at Security Locknut is ready to assist you with product selection or develop a custom solution to meet your product needs.

Available in a Variety of Sizes & Styles


The Security Locknut is available in a wide variety of sizes, body styles, coatings, pitches and grades
  • Inch series range from 3/8" to 4"
  • Metric series range from M10 to M64
  • Course and Fine threads
  • Grade 5, Grade 8, Class 8, Class 10
  • Plain steel or Zinc Dichromate plated


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