When extreme high temperature stability & strength are required

Molybdenum hex head bolts possesses a very high melting point of 2620°C, a low coefficient of thermal expansion and a high level of thermal conductivity. Because molybdenum bolts 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 hex head bolts to oxygen above 600°C will cause them to readily oxidize.

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

ResourcesMolybdenum Torque Spec

Bolt Types Available: Hex BoltsShoulder Bolts

 


Molybdenum Hex Head Bolt Features and Benefits

It is important to differentiate between a molybdenum hex head bolt and hex head cap screw. Often people assume they are the same, but they are actually very different fasteners in terms of how they are manufactured, as well as from an application perspective. Regardless of your choice, molybdenum hex heads offer strong, stable joints because of their large head service. 

The Hex Comparison

Hex Head Bolts

Hex Head Cap Screw
  • Hex bolts have a flat end and lack the washer face under the head.
  • Appropriate for when mechanical properties are more important than dimensional tolerances.
  • Features flat washer facing under the bolt head.
  • Also called a finished hex bolt. 
  • Has tighter tolerances on the body dimensions. 
  • Best used for precise applications where tight tolerances on the body dimensions are required. 

 


Common Molybdenum Bolt 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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