Negative CTE ALLVAR Round Bar and Tube

Negative thermal expansion ALLVAR Alloy 30 is offered in two semi-finished forms - bar and tube. The maximum sizes are 2.25" for roundbar and 3.00" outer diameter for tube.

Custom Negative Thermal Expansion Products or Components

The negative thermal expansion of ALLVAR Alloy 30 can be machined into custom products or components best suited for your specific product or project. Not sure if ALLVAR is a good fit for your project? Please contact us. We would be happy to discuss negative thermal expansion Alloy 30's applicibility for your application.

Negative Coefficient of Thermal Expansion Washers

Negative CTE washers and spacers from ALLVAR compensate for the natural expansion and contraction of other materials with variations in temperature. ALLVAR washers/spacers combat other materials' thermal displacement to keep constant force loads - no matter if it's 80°C or -150°C. Athermalization of fastened assemblies can be achieved by eliminating the thermal stress induced by different materials.


Kit includes:
• 12 hours of design and engineering time from Allvar engineers
• Set of washers (quantity depends on size of washers and the application)

Washers available in #2, #4, #6, and #8 sizes. Custom washer and spacer sizes are available 

Type B Regular Plain Washers

Nominal Washer Size Washer Inside Diamter Washer Outside Diameter Thickness Range Washer Standards ASME B18.24 Part Number Item Number
2 0.094" 0.250" 0.028" - 0.036" ASME B18.22.1 AEW26X08R000GY0A1 AW30-0002 Contact for pricing
4 0.125" 0.375" 0.036" - 0.045" ASME B18.22.1 AEW26X11R000GY0A1 AW30-0004 Contact for pricing
6 0.156" 0.438" 0.036" - 0.045" ASME B18.22.1 AEW26X13R000GY0A1 AW30-0006 Contact for pricing
8 0.188" 0.500" 0.036" - 0.045" ASME B18.22.1 AEW26X16R000GY0A1 AW30-0008 Contact for pricing