A hex drilling screw (also called a self-drilling hex head screw or Tek screw) is a specialized fastener designed to drill, tap, and fasten materials in one step without pre-drilling. It combines a hex head (for high-torque driving) with a self-drilling tip (like a drill bit), making it ideal for metal-to-metal or metal-to-wood applications.

Key Features of Hex Drilling Screws

1. Hex Head (6-Sided):

   • Driven with a socket wrench, impact driver, or hex bit.

   • Provides better torque transfer than Phillips or slotted heads, reducing stripping.

2. Self-Drilling Tip:

   • Acts like a drill bit to pierce metal or hard materials (no pilot hole needed).

   • Tip styles vary by material thickness (e.g., #2 tip for thin metal, #5 for thicker steel).

3. Thread Design:

   • Coarse threads for wood/soft materials, fine threads for metal.

   • May include cutting flutes to clear debris during drilling.

4. Materials & Coatings:

   • Steel (zinc-plated, galvanized) for general use.

   • Stainless steel (304 or 316) for corrosion resistance.