High Temperature Fastener Materials

High temperature fasteners are made of materials designed to withstand the most challenging conditions. Special alloys, coatings, and stainless steel are common materials that can perform in extreme temperatures.

Special Alloys

Find the high temperature fasteners you’re looking for here. 

For extreme cases, such as in machinery or the aerospace industry, special alloys have been formed that allow fasteners to perform well. Heat-treated in high temperatures and forged together, these alloys are handpicked to withstand temperatures up to and including 1000 degrees Fahrenheit or 587 degrees Celsius.
Heat-treated forged alloys are available in a wide range of fastener styles and sizes. However, special orders must be placed for these fasteners, and a significant wait time could be required.

It’s best to get the ball rolling during the design phase, in order to reduce the amount of time waiting for the proper fasteners. It’s also wise to order ahead of time for maintenance needs, as fasteners tend to have a shorter lifespan in high temperature conditions.

Coated Or Treated Fasteners

Traditional hot-dipped galvanized fasteners can only handle so much heat. The ASTM specifications state that fasteners can be used in applications that stay within half of the melting point temperature of the coating.
In other words, zinc plated or hot-dipped galvanized fasteners coated in zinc cannot be used in applications above 390 degrees Fahrenheit or 210 degrees Celsius. Because the elemental melting point of the coating stands around 780 degrees Fahrenheit, any fastener that is coated in that element must remain within that limit.

Stainless Steel

Stainless steel comes in several types, including ferritic, austenitic, and duplex. Each type performs well at varying temperatures, depending on the circumstance. You can expect 304 stainless steel to have a maximum service temperature of about 870 degrees Fahrenheit or 465 degrees Celsius. Common Ferritic grades, such as 405 stainless steel, offer slightly lower maximum service temperatures at 815 degrees Fahrenheit or 435 degrees Celsius.