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These are effective but relatively pricey and typically used on larger hardware. There are a lot of other lock washer styles, so I encourage you to research additional options.

They may not hold the peak preload in all cases of vibration, but they will typically retain the nut, even if it loses some preload.

An image of a nylon insert nut is shown below. These are commonly used in high vibration environments on non-safety critical applications where you still want to prevent the nut from possibly loosening and falling off.

As an example, this type of fastener is used on my hitch mounted mountain bike rack, as shown below. In this application, there will be no immediate safety hazard if the preload is lost because the screw still supports the load in double shear.

However, if the screw falls out, there may be a safety concern, so we need to make sure the bolt remains connected. It works by installing a steel wire through a hole in a screw, bolt, or nut and anchoring it to another item.

Safety wire is often applied between a series of fasteners to hold them all together. The image below details such an application.

We can see that for one nut to loosen, the other must be tightened because of the orientation of the wire. This is very important to remember, because safety wire installed in the incorrect orientation is almost entirely useless.

Some sort of pin is placed through the threaded shaft or bolt to prevent a nut from backing off. The image below illustrates a castle nut:.

In this application, a hole is drilled in the bolt, so the cotter pin can go through the slots in the castle nut.

This prevents the nut from rotating in either direction to prevent loosening, but it still allows for the pin to be removed and nut loosened, if needed.

The image below is an example of a castle nut being used to secure a wheel hub in place:. They are even used in conjunction with a mechanical method above in many instances.

In the oil and gas industry, where the drilling environment sees extreme vibrations, it's common to use a lock washer and an adhesive.

The adhesives can be broken down as follows:. Loctite is the most widely known brand in the United States, but there are several alternatives.

The image below shows an example of Loctite blue applied to a bolt. It's important to note that Loctite comes in several grades, some of which are not intended to be removeable.

You'll have to ensure you're using the correct grade for your application. In some instances, it's just a dry nylon, and in others, it's an active adhesive.

Dry patches may be used to eliminate the process variability associated with manually dispensing adhesive threadlockers, or it may be used to improve the logistics of loose hardware that will require threadlockers.

As an example, I recently assembled some furniture that had dry patches on all the hardware. The manufacturer knew this would improve the reliability of the assembly and wouldn't require the end user to apply liquid threadlocker.

I've summarized these methods in a quick reference chart that will get you started in your search for a proper thread locker. As we've seen here, there are a multitude of ways to prevent threads from coming loose under normal operations.

However, it's important to choose the right method for the application. While the chart above will help get you started, more research should be done before you decide on your ultimate solution.

When selecting your method, it will help to walk through these options with vendors and coworkers in an effort to match your application with a close fit.

Your design can be further optimized if you test a few different options to see what gives you the best blend of attributes.

This post is provided by Fictiv , the most efficient manufacturing platform for fabricating parts. Powered by a distributed network of highly vetted vendors, the online interface makes it easy for customers to get instant quotes, review manufacturing feedback, and manage orders—all through a single service.

I don't know if Spiralock counts as one of these technologies, but Spiralock should be more widely known. Spiralock threading puts a shoulder which is ground to a slightly different angle on the entire screw thread so the entire bolt or screw gets compressive loading along its shaft, locking it in place by friction when the screw is tightened, while still permitting easy turning until it is tightened.

Finite element analysis shows that this removes the stress concentration along the top-most threads that occurs in regular screw and bolt threading.

He invented a machine specifically for testing the effect of vibrations on threaded fasteners. The first thing he discovered was that transverse vibration loads generate a much greater loosening effect than do axial vibrations.

Good to know. Not to worry, there are better locking options available. No amount of vibration will break this kind of connection:.

The jam nut should go on first! Otherwise the effectiveness of the nut pair is greatly reduced. Double nut Source. Before I move on to the next one I need to clarify the difference between static loads and fatigue loads.

Static loads do not change over time. If a bolt is rated to yield at 3, lbs of tension, any static load less than that will not have a permanent effect.

However, if you were to vary that applied load over time you can fatigue the bolt until it breaks using less than 3, lbs!

In the same way that a small stream can carve out the Grand Canyon, fatigue loads gradually chip away at the structural integrity of fasteners over time.

The relationship between fatigue load and the number of cycles until bolt failure occurs can be predicted using experimentation. It turns out that you can make reasonably accurate predictions of the cycle count at failure by performing as few as three experiments though I would recommend doing at least 6 to attain some real accuracy.

All it takes are a few data points and a regression line to create a high cycle fatigue life curve aka an S-N curve. Why is this useful?

Now that you know bolts can break from small fatigue loads, imagine trying to build a bridge using riveted or bolted connections. How could you trust that you ever had a big enough fastener?

It turns out that fatigue loads below a certain threshold will never cause the fastener to break. Note: the exact percentage can vary dramatically based on material composition and ambient conditions.

This is not so! In fact ANY additional load, no matter how small, will add to the tension in the bolt. But not at a rate. Think of pulling on a fastened connection as if it were 2 stacked springs.

Both springs stretch measurably, but the weaker one stretches more. Part of the external load is absorbed by the joint and part by the fastener. To be crystal clear, as you tighten the nut the bolt will compress the two parts together.

The bolt itself has an internal reaction force equal to the amplitude of the compression force, but the bolt itself is in tension. If you were to graph the tension on the bolt while you tighten the nut, the plot would look like the graph below.

Any more force and the bolt will enter the plastic region and permanently deform. Since any additional force will begin to yield the bolt, you want to give yourself some margin for error.

Engineers select a bolt tension that is somewhere between the calculable minimum functional clamping force and the yielding force…. It is actually quite difficult to determine the exact load the fastener sees during clamping.

We now know how important it is to avoid over tightening a bolt, but how do we know when it is yielding? For everyday purposes the clamping force can be approximated by measuring the tightening torque.

Those methods work OK for most things, but some critical applications require you to be certain of the clamping force think spacecraft or large weights above your head.

The torque method has difficultly accounting for friction and lubrication, but at least the torque is mathematically correlated to the clamping force.

There are better options though. Load indicating washers can accurately verify bolting loads by squishing open a paint sack after reaching a specific load.

The drawback with these is that they only work once. This is by far the most accurate method of measuring bolt clamping load.

Bolts actually stretch very slightly when force is applied, which causes the loading on each thread to be different. Because of this stretch, when you apply a tensile load on a threaded fastener the first thread at the point of connection sees the highest percentage of the load.

The load on each successive thread decreases from there, as seen in the table below. Additional threads beyond the sixth will not further distribute the load and will not make the connection any stronger.

So will a bolt break before the nut strips? Have you ever seen a fastener labeled with a 2A or 3B rating and wondered what that meant? That number-letter combo is used to indicate the thread class of the fastener.

Thread classes include loose to tight , A external , and B internal. These ratings are clearance fits which indicates the level of interference during assembly.

Finely threaded bolts have slightly larger cross-sectional areas than coarse bolts of the same diameter, so if you are limited on the bolt size due to dimensional constraints, choose a fine thread for greater strength.

Fine threads are also a better choice when threading a thin walled member. Fine threads also permit greater adjustment accuracy by requiring more rotations to move linearly.

On the other hand, coarsely threaded bolts are less likely to be cross threaded during assembly. They also allow for quicker assembly and disassembly, so choose these when you will be reassembling a part often.

Coarse ly threaded fasteners are much more commonly available in the united states. Would you expect a bolt to be stronger or weaker at very high temperatures?

How about at cryogenic temperatures? Why would steel be strongest at whatever typical room temperature happens to be?

Room temperature is just another non-extreme point on the curve. You can make bolted connections more resistant to shear loads by using clever design instead of larger bolts.

For maximum strength, try to use the correct thread length for the connection. In the image below you can see two connections which are identical except that the one on the right has a properly sized thread length.

It exposes the bolt shank rather than the threads to the applied load at the connection seam. All else remaining the same, the connection on the right will be stronger because the shank has a larger cross-sectional area and no stress concentrations.

In the images below there are two connections. The one on the right is twice as strong as the one on the left because it would have to shear the bolt off in two places to become free.

Also, the single shear configuration can also lead to bending loads on the fastener and loosening of the connection see 1.

Have you ever cursed the day you were born because you just stripped out a Phillips head screw? As frustrating as that is, it turns out that Phillips head screws are designed to strip out via the tapered point and rounded edges.

The technical term is called a cam-out and every time it happens the relative surface motion wears out your screw.

Alternate screw heads like torx and pozidriv are specifically designed not to cam-out. Actually every book by Carroll Smith is pure gold.

I think the spring washer actually at least in current usage is to increase preload with a controlled deformation.

When you have say a safety item with This causes a preload that puts the energy back into the tightening torque and not the strain energy of the steel.

Basically it controls your torque limit so you can keep it fastened without torquing the nut but still maintaining the preload to prevent loosening from NVH or light brushing torques.

Basically, lower loosening and install torques but still same preloads and tolerancing. Like Like. Like Liked by 1 person. Its an interesting piece of trivia for sure, and Im always looking to pick up more if you know of any.

Spring washer is very good for the correct purpose: when the fastener is tightened as necessary only, when actually no need such fully tightened.

Spring washer will keep the bolt in place. I believe the nut you are discussing are called castellated nuts. Then a pin goes through to lock them in place.

Torque wrench for lug nuts is a must though. There is a whole class of nuts called deformed or distorted thread lock nut. By punching the edge or face of a nut you can deform the threads for an interference fit with the bolt.

The punching leaves those telltale squares or triangles on the nut. Much more subtle than a castellated nut, which rely on a cotter pin for its locking action.

One of those things is about fastener. The subject of nuts and bolts may be a simple one for mechanical engineers, however. As a subject […]. First, thank you for the article.

I was surprised to learn that as that is my second oil on the shelf next to olive oil. I will be doing further research on the topic. Hi Patricia, I understand your concern.

There is much hype out there about canola oil being a bad oil. There is evidence that canola oil does not contribute to heart disease, high cholesterol, and even diabetes.

The less we use of all processed oils, the better! Coconut oil is the best heated or not. Canola is bad heated.

Once heated it has loads of saturated fat.

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She was teaching me that canola oil is very bad for your health. I was surprised to learn that as that is my second oil on the shelf next to olive oil.

I will be doing further research on the topic. Hi Patricia, I understand your concern. There is much hype out there about canola oil being a bad oil.

There is evidence that canola oil does not contribute to heart disease, high cholesterol, and even diabetes. The less we use of all processed oils, the better!

Coconut oil is the best heated or not. Canola is bad heated. Actually every book by Carroll Smith is pure gold. I think the spring washer actually at least in current usage is to increase preload with a controlled deformation.

When you have say a safety item with This causes a preload that puts the energy back into the tightening torque and not the strain energy of the steel.

Basically it controls your torque limit so you can keep it fastened without torquing the nut but still maintaining the preload to prevent loosening from NVH or light brushing torques.

Basically, lower loosening and install torques but still same preloads and tolerancing. Like Like. Like Liked by 1 person. Its an interesting piece of trivia for sure, and Im always looking to pick up more if you know of any.

Spring washer is very good for the correct purpose: when the fastener is tightened as necessary only, when actually no need such fully tightened.

Spring washer will keep the bolt in place. I believe the nut you are discussing are called castellated nuts. Then a pin goes through to lock them in place.

Torque wrench for lug nuts is a must though. There is a whole class of nuts called deformed or distorted thread lock nut. By punching the edge or face of a nut you can deform the threads for an interference fit with the bolt.

The punching leaves those telltale squares or triangles on the nut. Much more subtle than a castellated nut, which rely on a cotter pin for its locking action.

One of those things is about fastener. The subject of nuts and bolts may be a simple one for mechanical engineers, however. As a subject […]. First, thank you for the article.

Second, I found on youtube this video also from boltscience. From what I see the test shows now that helical spring washers do help.

The amplitude in change but still. Can you please check out the video, what do you make of this? This other test conducted by Nord — Lock shows again that spring washers do have an positive effect.

What about the general use of flat washers? Washers are used to provide a bearing surface for a nut or screw head, cover large clearance holes, and distribute fastener loads over a large area, particularly on soft materials.

They are useful hardware for many reasons but are not intended as a reliable source for vibration protection. The fastener is easier to tighten due to the two bareing surfaces and, obviously, is therefore easier to loosen off too.

Obviously there are other advantages as well, such as reduced material deformation and increased stiffness and sliding friction around the hole without increasing the fastener size.

My experience is a smooth flat hardened washer allows for higher bolt tension vs. It acts as a bearing surface by lowering friction under the head of the bolt.

How can you know what tension the bolt is under? Do spring washers protect against vibration loosening? Not if the user installs them with the same torque as without.

Does Loctite protect against vibration loosening? Maybe, if the bolt was properly tightened while the Loctite was still wet. You need to add a few ft-lbs of torque to account for the added thread friction even when wet.

Eric, These are excellent points, thank you for sharing! Bolt tension is what we ultimately care about but we can only easily estimate that via tightening torque or turn of the nut.

It hadnt occurred to me, but of course the nordlock washers would affect that torque measurement. Some amount of setting occurs at each interface on and also after tightening.

One of the advantages of using a washer under the tightened component either nut or bolt head is probably better control of under head friction, if a good quality washer is used.

In that case, I think the taper is primarily for centering, but it also serves to prevent transverse motion.

Plus, you do your wheel nuts up really tight! Preventing the transverse motion is probably the answer. Note, the Juncker test actually tests the joint reliability against loosening due to transverse vibrations.

Glad to see a format like this. Electrical connections should use flat washers I believe but I have no test data to support that, only experiences.

With flat washer and split ring approach, higher torque can be applied and a gas tight seal is made such that oxygen can not start corrosion.

With serrated nuts or star washers, lower torque leads to more open circuits and some sort of liquid tape is needed to seal the moisture out which assembly and service people hate.

I am searching for better answers in this area. Thanks for the interesting article about fasteners. Plus, it would be cool to test out these different types and see how differently they feel.

Here is something really trick for locking threads. It is called the Saper-Lock. It uses a coil spring which is contained within the nut and wraps into the threads.

Threading into the nut springs the coils open to allow for the threads to make up. As you try to unthread the bolt, the spring wraps tighter around the minor diameter of the bolt not allowing rotation sort of like Chinese handcuffs.

The more torque you put into the bolt, the tighter it gets. These are used in very high vibration environments such as train stations.

To release the bolt, one leg of the spring is expanded with the socket to relieve the tension and allows the bolt to release. Very clever Germans. Google Saper-Lock.

Very clever little nut, I had never seen that one before. Thanks for sharing! This week I was working with an 84 year old!!!

Being a still curious about things 71 year old, I decided to google that lock washer theory and ended up on your site. Who knew there could be so much information and controversy about fasteners!!

Have bookmarked your site for future reference. I have found lots of references that seem very legitimate proclaim that the split lock washer is useless or worse.

I work in aerospace and they are common, so I had a hard time believing it was still used based on tradition and the momentum of wrong information.

Bickford is an expert on fasteners and he has made his career studying them. His handbook is one of the most used ME references for fasteners.

He refers to a study published in a journal where it was determined that they are beneficial when used appropriately. The pitfall all of the readily available resources fall into is assume the design intent behind the split lock washer was only to flatten the washer where the cut ends are on the same plane.

The study indicates this was not the case. When load applied approaches the yield limit for the bolt, the washer twists or rolls. This is due to the trapezoidal cross section of the washer.

The spring constant is much higher in this mode, and it effectively adds a significant length to the bolt. It is well documented that this has a beneficial effect on preventing loosening.

The following is just conjecture on my part, I have not found anything solid to back it up. But I believe these were first produced prior to I could not find anybody credited with the invention.

They were cheap to manufacture, and were copied and used without really understanding how they worked. I think the helical shape of the lockwasher is a result of the method of manufacture, not a requirement of the design.

Studies were performed like some of the ones you cite that show they are ineffective long after the design intent was forgotten.

A theoretical analysis where one does not go past the force required to flatten the washer make it appear insignificant. The study discussed by Bickford implies that to get the benefit from the lockwasher you must reach a certain pre-load.

So the base material has to be able to withstand that load. Also the most benefit would be seen with designs where a critical joint does not have the space for a long shank bolt or screw.

So they are not the best and for every application. But they are not useless either. Although it is not a sugarless gum, in Wrigley's replaced some of the sugar with artificial sweeteners aspartame and acesulfame potassium.

Wrigley began running Doublemint Twin commercials again in with a new set of twins, Natalie and Nicole Garza , who were dressed in old-fashioned clothes.

They drove a tandem bike through various modern day situations, singing about the complexity of modern life and touting the joy of the simple pleasure of Doublemint gum.

Wrigley also began an open casting call for people to be in their ad campaigns. The call goes out to not only actual twins but also, literally, anyone and their dog.

Many twins have applied, but so have people and their friends, their pets, even inanimate objects. These can be seen at the official Doublemint Gum website.

Since then, the Wrigley Company has run various commercials with some of the new twins, as well as Natalie and Nicole from the campaign.

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