A superb combination of corrosion resistance, temperature stability and non-conductivity

Alumina ceramic flat head screws are one of the most thermally resistant screws available. Due to their outstanding thermal resiustance, alumina ceramic screws are geared for the most demanding high temperature applications. Alumina ceramic flat head screws also have outstanding corrosion resistance and are highly chemically resistant to acids, solvents, and salts. Additionally, alumina ceramic screws find many uses in high voltage applications due to their non-conductive electrical properties.

Alumina ceramic screws are available in both metric and standard sizes. Please contact us if you have any questions about the properties or availability of our ceramic flat head screws.

Flat head screws made from customer specified ceramic grades or custom dimensions are available upon request.

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


Alumina Flat Head Screw Features and Benefits

Alumina 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.

Alumina 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°

 


Common Ceramic Grades

Alumina 99.8%

Alumina ceramic or Aluminum oxide (Al203) is the most common grade of alumina ceramics and is designated as being 99.8% pure. Alumina is most known for high temperature stability and has a usable temperature limit of 3000°F (1650°C). Alumin has the greatest balance of economy, mechanical and thermal properties.

Various other compositions of alumina ceramic are available upon request.


Alumina and Zirconia Properties

Ceramic Properties


Corrosion Resistance of Common Ceramics

Ceramic Corrosion Data

 

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