Duro PT® thread-cutting screws are engineered to meet the demanding requirements of thermoset plastics, easing assembly and ensuring a strong, reliable joint to maximize assembly performance.

Duro PT® screws feature an asymmetrical 30° thread profile, inclined towards the load surface to increase friction between the application and the fastener.  This feature reduces radial stress, reduces back-out caused by relaxation, increases strip resistance, and eliminates need for supplementary locking devices.

Fast Facts: 

  • Cuts threads in stiffer plastics
  • Minimizes installation torque
  • Maximizes assembly performance
  • Optimal thread pitch for deeper thread engagement
  • Recessed thread root provides space for displaced material
  • Shank slot minimizes chip production



  • Sizes: S22 to S80 diameter, up to 152mm under head; other sizes may be available on request
  • Head Styles: Pan, flat, hex, round washer, hex washer, oval, button head, fillister
  • Specials: Shoulder screws, SEMS, double-end studs, collar studs; others as required
  • Drive Systems: TORX PLUS® Drive System is recommended to facilitate the proper amount of torque transfer required for cutting threads; other styles are available

Disclaimer: DURO PT® is registered trademark of EJOT and TORX PLUS® is registered trademark of Acument Intellectual Properties.

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The availability of the products described on this site, and the product descriptions, may vary from country to country. Consult your STANLEY® Engineered Fastening Account Executive or your local distributor for specific product information.