The ultimate temperature resistant polymer

Polyimide or Vespel® flat head screws are made from an advanced temperature resistant polyimide resin. Vespel flat head 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 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.

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

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


Vespel Flat Head Screw Features and Benefits

Vespel flat head screws are characterized by having a head with a top flat surface (which can feature either a slotted, phillips or allen driver) and bottom that is cone shaped or countersunk. With this design, the head of the screw can align flush or below the surrounding surface having obvious benefits.

Vespel Slotted vs. Phillips Driver 

 Slotted Head Advantages Phillips Head Advantages 
  • Slotted head screws tend to strip less than Philips, especially in harsh environments
  • Slotted heads are typically better in applications where it's going to be unscrewed and re-done periodically, as the head tends to wear less.

  • In dirty environments, a flat head is much easier to clean out

  • Phillips head offers a much stronger joint since it can tolerate more torque.

Countersink Angle

For most flat head screw designs the angle of countersink is usually 82° for UNC and UNF applications however other angles ranging from 60° -120° could be specified. 

Thread Type Normal Flat Head Countersink Angle

UNC / UNF

82°

Aerospace 100°
ISO Metric / Imperial 90°

 


 

Vespel Properties

Vespel Properties     

Vespel Mechanical Data

 Vespel Tensile Data


Chemical Resistant Vespel screws

Vespel Corrosion Data

 

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