Posted by Peter Erickson on 4/19/2012 to
Rivets & Fasteners
Sheet Metal Screw Thread and Tip Types
Sheet metal screws are most commonly referred to a Type A, Type B or Type AB where a Type A sheet metal screw has a sharp pointed end, Type B has a 60 Degree flank angle thread with a blunt end and the type AB has a 60 Degree flank angle thread with a sharp point end which can form a thread in soft materials.
Sheet metal screws are now available with drill points like the K-Lath Screw or what is
referred to as a Tek Screw or self-drilling screw. Each Tek style screw can be selected with its own distinct Protrusion Allowance... i.e. #1 Pt, #2 Pt or #3 Pt.
referred to as a Tek Screw or self-drilling screw. Each Tek style screw can be selected with its own distinct Protrusion Allowance... i.e. #1 Pt, #2 Pt or #3 Pt.