When extreme high temperature stability & strength are required

Molybdenum button head cap screws possess a very high melting point of 2620°C, a low coefficient of thermal expansion and a high level of thermal conductivity. Because molybdenum screws have the ability to withstand extremely high temperatures without changing shape, expanding or softening significantly, they are ideal for high strength / high temperature applications that are shielded from oxygen. Exposing molybdenum button head cap screws to oxygen above 600°C will cause them to readily oxidize.

As a result, molybdenum button head cap screws find their way into high temperature vacuum furnaces, glass production, military and space applications where oxygen is not present.

ResourcesMolybdenum Torque Spec

Screw TypesButton Head Cap ScrewsFlat Head ScrewsHex Cap ScrewsPan Head ScrewsSet ScrewsSocket Head Cap Screws


Molybdenum Button Head Cap Screw Features & Benefits

Molybdenum button head cap screws combine the similar shape of a pan head with the driver of a socket head. The socket driver is ideal for low clearance applications that require a large area clamping face. Compared to a standard socket head cap screw, molybdenum button heads have a lower and wider profile. This can be useful when the clamping material is too thin to counter-bore.

Advantages

  • Wide bearing surface for clamping
  • Low profile head

 


Common Molybdenum Screw Grades and Specs

Molybdenum (Commercially Pure)

Because of its high melting point of 2620C and its good strength, pure molybdenum finds it niche in high temperature vacuum or inert environments without oxygen.

Molybdenum Specifications: ASTM B386, ASTM B387, Type 361

Molybdenum Chermistry

TZM - Titanium / Zirconium / Molybdenum Alloy

This alloyed version of molybdenum provides enhanced strenght at elevated temperatures and is excellent for support structures in vacuum furnaces or other high temperatuer and oxygen free environments. 

TZM Specifications: UNS R03630, ASTM B384, ASTM B385, ASTM B386, ASTM B387

TZM Chemistry

 


Mechanical Properties

Molybdenum Tensile Curves

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