SAE J78

Full Name

SAE J78 – Steel Self-Drilling Tapping Screws

Scope

SAE J78 is a standard published by SAE International that covers the dimensional and general specifications for carbon steel self-drilling tapping screws. These screws are designed to drill, tap, and fasten in a single operation, making them ideal for applications where speed and efficiency are crucial.

The standard encompasses point styles 2, 3, 4, and 5 and includes performance requirements to ensure consistent functionality. The primary objective of SAE J78 is to guarantee that these screws can effectively drill a hole and form or cut mating threads without deforming their own thread or breaking during assembly.

Materials

The screws covered under this standard are made of carbon steel, providing a balance of strength, durability, and cost-effectiveness for various applications.

Mechanical and Performance Requirements

SAE J78 outlines specific mechanical and performance requirements for these screws. These requirements include:

  • Drill performance: the ability of the screw to drill through the intended material without significant damage or breakage.
  • Thread forming/cutting: the screw must be capable of forming or cutting mating threads in the base material to create a secure fastening.
  • Torsional strength: the resistance of the screw to twisting forces during installation and use.
  • Axial tensile strength: the ability of the screw to withstand pulling forces along its axis without failure.

Applications

Self-drilling tapping screws are commonly used in the construction industry for fastening metal sheets, panels, and other components. They are also used in the manufacturing of appliances, HVAC systems, and automotive parts.

Testing and Certification

Manufacturers of SAE J78 compliant screws typically conduct tests to verify compliance with the standard. Certification to SAE J78 assures users of the quality and performance of these fasteners.

Importance in Construction

The use of SAE J78 compliant self-drilling tapping screws in the construction industry contributes to improved efficiency, reduced labor costs, and enhanced structural integrity. Their ability to drill and tap in a single step simplifies assembly processes, making them a valuable asset in various construction projects.

By adhering to SAE J78, construction professionals can ensure the reliability and safety of fastened connections, ultimately leading to more durable and sustainable structures.

SAE J78 Accredited Laboratory

Applied Testing & Geosciences, LLC is accredited for performing tests using the SAE J78 standard.

Contact us for more information.

Resources

Keywords

self-drilling tapping screws; steel; carbon steel; point styles; performance requirements; drill performance; thread forming; thread cutting; torsional strength; axial tensile strength