Galling Definition: What is It and How to Prevent It

preventing galling with bossard

The galling definition is an interaction (usually negative) between two materials as they slide past each other. It is also known as cold welding which occurs frequently in mating threads of similar materials and surface conditions. Stainless steel fasteners are the most prone to galling but can also occur with aluminum and titanium as well.

Prevention of galling simply involves changing the surface condition of one of the mating components. If dealing with aluminum, changing the alloy of one of the components is sometimes enough. Hardening to create a difference in the mating surfaces is another option. Lubricants are also good deterrents of galling.

However, there are several ways in which you can prevent or minimize galling. Check out the infographic below for those solutions.

top coats for preventing galling

Take some time to think about preventing galling when you are assembling your next project. It will save you time, effort, and money in the long run. In order to find out more about preventing galling, contact us at

February 10, 2017
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Get a Leaner Process by Having Less Friction

Tribology with Bossard

You are always working toward a leaner production. It will save you time and money. When looking for that leaner production, materials, friction, lubrication, and wear should be something you consider.

This is because when creating a fastening joint, there is going to be friction involved. That friction is simply the interaction between contact surfaces of two bodies. When thinking about friction, tribology is something that needs to be considered.

Tribology is the science and technology of surfaces affecting each other in relative motion.

Tribology covers subjects like friction and wear as well as lubrication. Lubrication is a necessary part of assembling a joint and connecting elements because it helps achieve a reliable and quality connection. Lubrication is also important because it can help prevent screw breaks which can lead to unscheduled shut-downs in assembly operations.

When lubricating, you have the option of fluid lubricants or dry coats. Tribological dry coatings are anti-friction coatings used instead of fluid lubricants. These dry coatings, such as Bossard ecosyn®-lubric, are used on screws, nuts and washers and they create a smooth film that optimizes the friction conditions by evening out irregularities.

When you are working on developing the best mechanical technologies, tribology is an important consideration. You will also want to inspect your products regularly to check for safety-related screw connections. You will also want to consider using tribological coatings to improve your process.

October 28, 2016
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Friction and Friction Coefficients

Friction Coefficients

Friction and Friction Coefficients

For the purposes of this blog post, we’ll be covering the relation of friction coefficient classes to guideline values for materials/surfaces and types of lubrication, and for screw connections.

There are variations of friction coefficients because they are dependent on multiple factors. Those factors include the material combinations, the quality of the surface finish or depth of roughness, the surface treatment, and the method of lubrication.

Why is this important? Because the conditions for friction need to be precise and the variations restricted as much as possible. All factors need to be considered for a securely fastened joint.

See the table below for friction coefficients for threads and for bearing surfaces. All of the data collected here is valid at room temperature.

Friction coefficients for threads

Need to know more about friction and friction coefficients? We’d love to chat in further detail! Contact us at to start the conversation.

December 11, 2015
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Advantages of Bossard’s ecosyn®-lubric Products

Bossard is all about innovation – and our ecosyn® product line is proof of that. Ecosyn®-lubric, in particular, is one to watch out for when it comes to fastening solutions.

Ecosyn®-lubric is essentially a dry coating with outstanding durability and performance data. Non-electrolytically applied, this thin coating boasts integrated lubricating properties and is very effective in protecting against contact corrosion.

In particular, ecosyn®-lubric provides excellent protection against fuels, hydraulic and cleaning solutions, in addition to seizing and galling. ecosyn®-lubric also utilizes organic solid lubricants and fluoropolymers. Optimized and consistent friction coefficients are also a benefit of using these products. With pre-applied lubrication, you will also never have to forget about manual lubrication. This product allows for downsizing of applications and less material requirements for applications as well.

But the most significant benefit of using ecosyn®-lubric is that it is best suited for applications with an emphasis on safety and optimization of costs. Essentially, ecosyn®-lubric is a unique option that is both efficient and cost effective for your operation.

More advantages include high temperature stability, and no impairment of mechanical properties of high strength fastening elements. With ecosyn®-lubric, there is also no danger of hydrogen embrittlement.

In terms of safety, the aforementioned corrosion resistance is a huge benefit, but ecosyn®-lubric also has a very narrow friction scatter for a more precise and consistent preload. If you require repeatable tightening, the durable coating ensures the same conditions throughout.

Ecosyn®-lubric is available in two colors: black and silver.

Considering the current challenges of assembly, ecosyn®-lubric represents a more economical solution – one you can’t ignore. To learn more about the innovative line of ecosyn®-lubric products that Bossard has to offer, contact Bossard at

May 08, 2015
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