Apr 11, 2023
The Story Behind Prevailing Torque Locknuts
Scroll through the story of Security Locknut below. A MILITARY PRODUCT How It All Began In December 1915,…
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Mission-Critical Bolted Joints
Backed by 50 Years of American Engineering & Manufacturing
When a bolted joint fails on critical equipment, you get downtime, damage and danger. Engineers, operations and safety teams in rail, mining and other heavy industries rely on Security Locknut to keep their toughest joints tight, joint after joint, year after year.
Unlike other “locking” solutions, Security Locknuts use a precision steel lock ring to generate the highest prevailing torque. Once engaged, the nut can’t spin off the bolt even when tension is gone.
Roughly 3× the locking force of nylon-insert nuts and other alternatives: a measurable difference you can feel on the wrench.
Install and remove again and again. Approved to the NYC Transit Authority standard of 5 reinstallations where most alternatives fail after two.
Security Locknuts perform across extreme hot, cold and corrosive conditions with optional ATD/ArmorGalv coating.
Designed, machined and assembled in-house from American steel. We own the technology and are ready to speak with you about your application.
Security Locknuts are built for a wide range of industries where critical bolted joint failure isn’t an option, including:
Track joints, turnouts, signals, and rail-car hardware; approved for Class I, metro and international rail networks.
Learn More →SAG and ball mill liners, longwall AFC chains, crushers, and other equipment that cost their owners a fortune when they go down.
Learn More →Conveyors, screens, feeders, and shakers that are designed to vibrate, and engineered to stay tight, need fasteners that do the same.
Learn More →Woodchippers, crushers, pulverizers, and related heavy equipment where bolt failure causes damage to people and machines.
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We don’t just sell you a nut. We help you solve the joint — and prove it works in your application.
Tell us about your application, what’s loosening, and what you’ve tried. The more we know, the better we can solve it.
Talk torque, tension and K-factor with the people who design and manufacture the product—often the owner himself.
Start with a small quantity or send us your bolt for a torque-tension analysis, and a process you can replicate on your equipment.
Lock in volume pricing and blanket orders; 80% of products are in stock with emergency orders often fulfilled when you need them.
Honest Guidance from People Who Know Bolted Joints
We’ll help you identify the exact torque to hit your target clamp load for your joints (dry or lubricated).
For significant applications, we can come to you and examine the joint, the equipment, and the install firsthand.
We will provide candid analysis, custom test design, and written recommendations for your demanding joints.
99% of orders are in stock but, when you need a custom solution, our engineering team is up for the challenge.
Apr 11, 2023
Scroll through the story of Security Locknut below. A MILITARY PRODUCT How It All Began In December 1915,…
Read more →Mar 8, 2022
Security Locknut uses a coordinate-measuring machine (CMM) to monitor manufacturing consistency and quality. Check out the video below…
Read more →May 27, 2021
Here’s a recent field test showing the installing of a 2”x 4.5 nut that highlights the issue. Left:…
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