Thread forming (rolling) screws are very popular in the automotive and plastics industries.

• TYPE TT (TAPTITE^®) (MACHINE and SHEET METAL TYPES) Some materials are “notch sensitive” which means that notches almost totally destroy the strength characteristics of the material. In these materials, Taptite can alleviate this problem. Taptites only deform material by cold working and not by removing material by cutting. The Tri-lobular shape of Taptite is the key to its ability for form threads. The trilobular configuration extends the entire length of the Taptite in contrast to most other thread forming screws which have a forming configuration only of the first two or three threads at the point.
  
• TYPE PT (PLASTITE^®) (SHEET METAL) thread-rolling screws were developed specifically for use in plastics. They combine a unique trilobular cross-sectional form with deep, wide, spaced threads. Three swaging lobes with full relief of the thread form reduce driving effort and operator fatigue. The three-lobed design of Plastite screws stablishes maximum resistance to vibrational loosening.  In addition, the screws' deep, coarsely spaced threads provide a heavier shear area and deeper thread engagement in the plastic, further enhancing holding capabilities. Plastite screws roll form high quality internal threads with no damage to the molecular structure of the plastic, significantly reducing the danger of material failure. Plastite screws come with different combinations of thread angles but 48/2 is the most common.
• HI-LO^® (SHEET METAL) fasteners (high-low is the generic term) are the minimal performance solution for fastening in low pressure environments such as plastic, particle board, Masonite, and wood. It’s designed with a double-lead thread where the high thread is sharper than a conventional one. More material is trapped in between the threads which helps to resist pull-out. This also allows for a lower driving torque. Perfect screw for low-stress applications with reduced cracking in plastic bosses.