What Are High Temperature Fasteners?

As the name suggests, high-temperature fasteners are specially designed to withstand high temperatures. Why are they needed?

Regular metal fasteners have a tendency to melt when the temperature crosses the quadruple digits, that is, 1000 °F or more. At such high temperatures, these fasteners can undergo oxidation, which is basically a faster form of corrosion and rusting.

One example is machinery that gets heated above a certain temperature. When this happens, the metal fasteners attached to it expand and exert pressure on the holes that they are driven into. When the machinery is not in use it cools down, which contracts the metal fasteners and makes them loose within the holes.

This is one reason for introducing special high-temperature fasteners which have the capability to withstand the alternate phases of extreme heat and cool down efficiently without getting damaged.

Different Types of Alloys Used  

High-temperature fasteners are made with select alloys whose properties match those required by the fasteners. The following are certain alloys which qualify for use:

Nickel Alloys: Some common nickel alloys, such as Inconel 600, 625, and 718 are used in these fasteners. They have a good oxidation resistance and can survive high temperatures in the range from 1800 °F – 2000 °F.

Stainless Steel 630: Exceptional hardness, great strength, and strong ductility make this alloy ideal for use in high-temperature fasteners. Stainless steel 630 is made extra hard by cold working and aging at low temperatures.

Stainless Steel 309 and 310: The reason these two alloys are used for the high-temperature fasteners is that they have a higher content of chromium and nickel as compared to other alloys. Stainless Steel 310 alloy is known to offer additional corrosion resistance in extreme environments.

A-286 Alloy: This is an alloy of iron, nickel, and chrome. The A-286 alloy is age hardenable and has great strength. It features an exceptional oxidation resistance and has the capability to withstand temperatures as high as 1300 °F.

Learn more about high-temperature fasteners at Norwood Screw Machine Parts. Based in Mineola, NY, for over 52 years Norwood Screw Machine Parts has been a leading supplier of custom screw machine parts. It is outfitted with single and multi-spindle screw machines, CNC milling and turning, CNC Swiss screw machines.