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CNC MACHINING MATERIALS

Invar

At a glance

Processes Lead Time Finishing Options Tolerance
CNC Mill
CNC Lathe
As fast as 7 days Vibratory Tumbling, Media Blasting, Powdercoating With drawing: as low as +/- 0.005 mm
No drawing: ISO 2768 medium

About the Material

Invar 36 is a nickel-iron alloy with excellent dimensional stability at a wide range of temperatures. The ’36’ stands for the alloy containing 36% nickel and has a super low coefficient of expansion.

Fictiv Material Invar 36

Materials Properties

Invar 36

Yield Strength (tensile)

Elongation at BreakHardnessDensity
40,000 PSI
30%Rockwell B908.05 g/cm^3
0.29lb / in^3

Material Finish

Invae 36 is very similar to most grades of steels/stainless steel in terms of overall appearance. Invar can be media blasted or tumbled to achieve a multitude of surface finishes. Additionally, powder coating can be applied to achieve more matte/glossy colors.

 
 

Design Recommendations

 

Min Wall Thickness

Min End Mill Size

Min Drill Size

Max Part Size

Undercuts

Radii : Depth

0.5 mm
0.8 mm (0.03 in)
0.5 mm (0.02 in)
1200 x 500 x 152 mm [x,y,z] (mill)
152 x 394 mm [d,h] (lathe)
Square profile, full radius, dovetail profiles
Depth must not exceed 12x drill bit diameter.
For end mills, depth must not exceed 10x tool diameter.

Cost Saving Tip

To reduce costs, limit the number of part setups, the number of inspection dimensions or tight tolerances, and deep pockets with small radii. If surface finish is not a concern, you may design your part to be made from the closest stock thickness, specified in a drawing.

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