flat head sFlat head screws are characterized by having a head with a flat top 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.

Driver Availability
(dependant on size/material)
•  Socket
•  Slotted
•  Phillips
Flat Head Screw Specifications
•  ASME B18.3, ASME B18.3.6
•  DIN 963 / ISO 2009
•  DIN 965 / ISO 7046
•  DIN 7991 / ISO 10642
 Flat Head Screw Sizes
•  #00 - 4"
•  M1.2 - M100

PEEK 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



Aerospace 100°
ISO Metric / Imperial 90°

Thread Options
Learn more about bolt threading and Extreme Bolt's threading capabilities by visiting our threading options page.

Flat Head Screw Availability

Engineered Polymers

Advanced Ceramics

Specialty Metals



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