The ultimate temperature resistant polymer

Polyimide or Vespel® hex head cap screws are made from an advanced temperature resistant polyimide resin. Polyimide or Vespel hex head cap screws offer a unique balance of mechanical, thermal, and chemical properties for outstanding performance in a variety of demanding applications such as automotive, machinery, industrial equipment, aerospace, and semiconductor equipment.

Polyimide or Vespel hex head cap screws also have the unique combination of properties such as excellent mechanical strength and toughness, exceptional radiation resistance, robust chemical resistance to many solvents, a low coefficient of thermal expansion, excellent creep resistance and flame retardance.

Polyimide or Vespel hex head cap screws are available in both metric and standard sizes. Contact us to learn more about polyimide screws or Vespel screw properties and availability.

Screw TypesFlat Head ScrewsHex Cap ScrewsPan Head ScrewsSet ScrewsSocket Head Cap Screws 


Vespel Hex Head Cap Screw Features and Benefits

It is important to differentiate between a Vespel hex head cap screw and hex head bolt. 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, Vespel hex heads offer strong, stable joints because of their large head service.

The Hex Comparison

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

Vespel Hex Head Cap Screw Advantages  

The most important feature of a Vespel hex head cap screws is that it has a larger bearing surface area which provide better clamping pressure than other type of fastener such as a socket head cap screw. Additionally, since debris build up is less of an issue with this style of fastener verses a socket head cap screw, they are ideal of dirty applications where particles could clog up a socket. Though Vespel socket heads are typically used for tight access applications, hex heads can be a better choice when there is only side clearance available for tightening. 

 


 

Vespel Properties

Vespel Properties     

Vespel Mechanical Data

 Vespel Tensile Data


Chemical Resistant Vespel screws

Vespel Corrosion Data

 

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