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Fasteners for High Temperatures

Temperature is an important factor to consider when determining which fastener is best suited for your application. Failing to take temperature into account can have severe consequences for your application. Here, we’ll cover various temperature ranges and the ideal fasteners for each one, with a specific focus on higher temperatures.

Temperature Range from -50 Degrees Celsius to 300 Degrees C
According to the ISO standard, standard property classes can be used for this particular temperature range. Your standard off-the-shelf 12.9 can be used, but it is important to remember that the 12.9 is limited to a specific range between -10 Degrees C and 250 Degrees C.

Above 300 Degrees C (570 Degrees Fahrenheit)
Low carbon steel or low ally steel can be used up to a ceiling of about 350 Degrees C (660 Degrees F). For this temperature range, the carbon content should be less than 0.4 percent.

Above 350 Degrees C (660 Degrees F) to 600 Degrees C (1,112 Degrees F)
Low alloy steels with an alloy element such as chromium, molybdenum, and vanadium are best suited for this temperature range. In addition to offering greater resistance to relaxation, these materials also possess tensile and yield strength that typically do not exceed that of property class 8.8.

Towards the higher end of this temperature range, best practices suggest the use of steels with higher content levels of chromium, molybdenum and vanadium.

Similar to the previous temperature range, the carbon content should be less than 0.4 percent.

Above 540 Degrees C (1,000 Degrees F)
Austenic steels, which are not heat treated, are best suited for this application. Their strength is achieved through work hardening. But depending on the environment, austenic steels or super alloys may have to be used for this temperature range.

Figuring out what best works with each temperature can be tricky. But we’re here to help! Contact us at ProvenProductivity@bossard.com if you have any questions about finding fasteners for high temperatures. The answers to your questions await!


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October 16, 2015
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