thread galling in nut and bolt

Thread Galling | How to Prevent it

How to Prevent

Thread Galling

What is thread galling?

Thread galling refers to a phenomenon that occurs when threaded fasteners, such as bolts, screws, or nuts, seize or lock up during installation or removal. It is also known as thread seizing, cold welding, or friction welding.

Thread galling typically happens when:

Implications of thread galling:

Thread galling can have several implications and negative effects, which can impact the performance, reliability, and safety of threaded fasteners and the overall systems they are part of. Some of the implications of thread galling include:

Galling can cause damage to the threaded surfaces, resulting in wear, deformation, or even the stripping of threads. This compromises the integrity and functionality of the fastener.

As galling progresses, the threads become more seized and locked together, requiring higher levels of torque to tighten or loosen the fastener. This can make disassembly or adjustment difficult or even impossible without risking further damage.

Galled threads may compromise the structural integrity of joints or connections. Weakened fasteners can lead to loosening, inadequate clamping force, or the potential for catastrophic failure in critical applications.

Thread galling can affect the smooth operation of mechanisms or equipment that rely on threaded fasteners. Stuck or damaged fasteners can impede proper assembly, disassembly, or adjustment, resulting in operational inefficiencies or downtime.

In applications where threaded connections require sealing, such as fluid or gas systems, thread galling can lead to leaks or inadequate sealing. This can result in fluid loss, compromised performance, or contamination.

Addressing thread galling often requires additional maintenance or repair efforts. This can involve disassembling and replacing of galled components, which can be time-consuming and costly, especially in complex or inaccessible systems.

Thread galling can pose safety risks, especially in industries where reliable fastening is critical. Equipment failures or structural integrity compromises due to galled threads can lead to accidents, injuries, or even loss of life.

How to prevent thread galling:

Lubrication Apply an appropriate lubricant to the threaded surfaces before assembly. Lubricants reduce friction and act as a barrier between the mating threads, minimizing the chances of galling. Use lubricants specifically designed for threaded fasteners, such as anti-seize compounds or assembly greases.
Material Selection Choose compatible materials for threaded components. Avoid combinations of materials with similar hardness, as they are more prone to galling.
Surface Finish Maintain smooth and uniform surface finishes on threaded components. Properly machined and finished surfaces reduce the likelihood of galling by minimizing friction and providing a more even contact area.
Torque Control Follow recommended torque specifications during assembly. Avoid excessive tightening torque, as it can increase the risk of galling. Use calibrated torque wrenches or other appropriate tools to ensure proper and consistent tightening without exceeding the recommended limits.
Avoid Rapid Assembly Avoid high-speed assembly or disassembly of threaded fasteners. Rapid rotation can generate excessive heat due to increased friction, which can contribute to galling. Take your time and apply steady, controlled force during the tightening or loosening process.
Pre-Assembly Inspection Inspect threaded components before assembly. Check for any visible signs of damage, burrs, or irregularities that could increase the risk of galling. Ensure that threads are clean and free from debris or contaminants that may affect their performance.

How Dicronite® can help:

Dicronite® is a dry film lubricant (tungsten disulfide) that has been used as an anti-galling coating in various industries and high precision applications.

Thread galling coating for 65+ years. 

Join countless engineers who use Dicronite® to prevent galling. 

Request a quote and lead time. 

Not quite ready for a quote?

Ask a Question

Request a Trial

3 thoughts on “Thread Galling | How to Prevent it”

  1. I was unaware of how many factors there were that affected a fastener’s ability to function properly. I’ll be sure to relay your article to my mother. She’s interested in getting some threaded fasteners for furniture assembly, but is unsure of what steps to take to obtain what she needs.

    1. Thank you for giving it a read! Please let us know if you have any interest in getting some fasteners coated – submit RFQ. Thank you for your feedback!

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top
two surfaces sliding blue icon

Sliding Wear

Sliding wear occurs when two surfaces slide against one another causing material loss to one or both surfaces. Over time, this can result in component failures, additional maintenance, and costly down time.  

Coating components with Dicronite® can help minimize this wear and reduce the need for maintenance and down time.


Ready to improve performance? Tell us about your application today.  

precision tooling equipment icon

Tight Tolerance Lubrication

Extremely tight tolerances can present challenges when lubricants or coatings are needed to reduce friction. Many products are available to help reduce friction, but in the case of very tight tolerances, few can be integrated without the need for adjustments.

Dicronite® has an average thickness of 0.5 microns (0.00002 inch) or less. This precision thin film allows users to incorporate Dicronite® on designs with tight tolerances without the need for design or manufacturing changes.


Ready to improve performance? Tell us about your application today.  

vacuum environments blue icon

Vacuum Environment Lubrication

Vacuum environments present a challenge for lubrication. Many conventional lubricants aren’t effective under vacuum and are largely vaporized.

Dicronite® can be used in vacuum to reduce friction where other lubricants can’t function. The outgassing of Dicronite® under vacuum conditions is well below screening levels for spacecraft materials per ASTM E595.


Ready to improve performance? Tell us about your application today.  

lightening bolt power output icon

Energy Lost to Friction

Friction is wasted energy! Systems with critical mechanical power output need to be extremely efficient.

Dicronite® optimizes mechanical efficiency by reducing friction losses and can even work in tandem with existing lubrication to further optimize efficiency.

Dicronite® is especially useful in precision systems, extreme environments, or where minimizing size and weight is vital.


Ready to improve performance? Tell us about your application today.  

multiple blue gears icon


Fretting is a unique form of sliding wear that occurs when contact surfaces oscillate over a very small range of motion. Although it may seem minor, this surface wear can ultimately lead to fatigue cracking and devastating damage.

Dicronite® helps remedy fretting by providing lubrication at contact surfaces. This effectively reduces the wear and surface stresses that cause so much damage.

Dicronite® can be integrated into existing designs and assemblies without any other adjustments for seamless reduction of fretting wear.


Ready to improve performance? Tell us about your application today.  

sun and snowflake blue icon

Extreme Temperature Lubrication

Extreme low or high temperatures can be challenging environments for lubrication. At low temperatures, conventional lubricants may be too viscous to be effective, while extreme high temperatures can result in breakdown of the lubricant.

Dicronite can be used in extreme environments to ensure effective lubrication while also being used in combination with oils and greases.

Dicronite is stable across a wide temperature range:


Ready to improve performance? Tell us about your application today.  

blue flame icon

Excessive Heat from Friction

As friction in an assembly generates heat, elevated temperatures can result in unwanted operating conditions.

This can cause overheating and accelerate the breakdown of materials, resulting in costly maintenance and down time or destructive failure.

Proper lubrication can help minimize friction, reduce heat, and increase mechanical efficiency. Coat parts with Dicronite® to avoid excessive maintenance and ensure components will run as efficiently as possible.


Ready to improve performance? Tell us about your application today.