Our Story
Scroll through the story of Security Locknut below. A MILITARY PRODUCT How It All Began In December 1915, Edward A. Green invented the...
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Oct 31, 2022
Mar 8, 2022
CMM Inspection at Security Locknut
Security Locknut uses a coordinate-measuring machine (CMM) to monitor manufacturing consistency and quality. Check out the video below...
May 26, 2021
Does an Impact Wrench Properly Tighten Your Bolted Joint? Hint: Probably Not.
Here’s a recent field test showing the installing of a 2”x 4.5 nut that highlights the issue. Left: Nuts were initially tightened with an...
Apr 26, 2021
Tension Testing: The Effect of Lubrication on K Factor
Surprise results testing bolt tension with different lubricants. Test Setup Bolt and Nut Used for the Tests Predicted Results Before...
Mar 4, 2021
What’s the Deal with Castle Nuts?
Castellated nuts, often called a castle nuts, employ cotter pins as a locking mechanism. We will walk through two key points that render...
Feb 16, 2021
Double Nuts — Do They Work?
Let’s compare a typical assembly using one nut and a bolt against the use of double nuts. Single Nut When the nut is rotated in the...
Jan 14, 2021
How Does the Security Locknut Work?
Last time, we discussed why you may not need a locknut if the joint is properly designed and assembled. But, in the real world, on...
Dec 9, 2020
Why You Shouldn’t Need a Locknut
You shouldn’t need a locknut if the bolted joint is properly designed and assembled. This means it’s designed to hold the working load,...
Oct 14, 2020
Torque-Tension Testing
The relationship between input torque and tension is the governing principle behind a well-designed bolted joint. Often, calculated...
Sep 14, 2020
Why is it Important to Keep a Bolted Joint Tight?
It is well understood that a fastener will fail if it is loaded above its capacity, as shown in example #1 below. What is less obvious is...
Aug 5, 2020
How Much Rotation Angle is Needed to Tighten a Fastener?
Hint: not as much as you think. To answer this question, let’s start with an example of a fastener assembly with a 3/4″ x 10 Grade 5 bolt...
Jul 7, 2020
How Much Does a Bolt Stretch?
Answer: a very small but important amount. In previous posts we discussed how a bolted joint works, how clamp force is calculated, and...
Jun 2, 2020
Bolted Joint Torque Explanation and Calculation
We are often asked what torque value should be used with a specific nut/bolt assembly. First, it’s helpful to understand that torque is a...
May 10, 2020
How is Clamp Force for a Bolt and Nut Assembly Calculated?
Clamp force is what holds a bolted joint together. Published charts are available for determining clamp force but we’ve found it’s often...
Apr 1, 2020
How Does a Bolted Joint Work?
A standard bolted joint consists of four parts: a fastener, object A, object B, and a bolt. The threads on a nut, unraveled, are an...
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