What Is the Angle on a Flat Head Screw

Flat Head (82 degrees) – Standard countersunk flat head screw. Allows for flat, smooth surface after installation. Flat Head (Metric) – Metric flat heads screws come standard with a 90 degree head angle.

What are the two common angles of flat head screws in the United States?

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.

How do you measure the head angle of a screw?

Flat heads are measured from the top of the head to the tip of the screw. Oval head screws are measured from the start of the undercut. Pan, Truss, Hex, Button, Socket Cap, and Round Heads are measured from right under the head.