Hex Head Self Drilling Screw ZP

Product Introduction

• Standard Name: Hex Head Self-Drilling Screw, Zinc Plated.

• Common Names: External Hex Self-Drilling Screw, Hex Head Drill-Point Screw, Zinc-Plated Self-Tapping Drill-Point Screw.

• Product Definition: A heavy-duty fastener featuring a hexagonal head that integrates drilling, tapping, and fastening functions. Requires use with wrenches (e.g., socket wrenches, open-end wrenches) to apply extremely high torque. Primarily used to secure thick metal plates or heavy components to metal substrates such as steel beams and channel sections. Zinc plating (ZP) provides basic rust protection.

Hex Head Self-Drilling Screw ZP Key Features

• Hexagonal head design: The hexagonal head (often with a washer head) facilitates the application of

  high torque using a wrench or socket, ensuring reliable installation.

• Self-drilling tip: The tip has a tek point, allowing drilling, tapping, and securing without pre-drilling in

  one step.

• Zinc Plated (ZP): Provides basic rust protection and a bright silver finish, enhancing corrosion resistance,

  suitable for indoor or mildly humid environments.

• Various sizes: Commonly #8-#14 diameter, 1/2"-4" (12-100mm) length, carbon steel construction, often

  with a serrated washer for enhanced anti-loosening.

• Advantages: Quick installation, economical and practical, high torque, but not suitable for extreme

  corrosion.

Working Principle

• Drilling stage: The drill tip penetrates the material (such as a metal plate), quickly drilling a pilot hole.

• Tapping and Fixing: The thread follows the cutting to form an internal thread, generating axial clamping

  force.

• Head Pressure Bearing: The hexagonal head (often with a washer) evenly distributes pressure, preventing

  material deformation; the zinc plating reduces friction and improves efficiency.

• Installation Control: Precise torque using a wrench avoids overtightening and material damage;

  the principle involves drilling, cutting, and friction interlocking.

Product Applications

• Sheet Metal Fabrication: Fast and efficient fixing of metal sheets, roofing, or wall panels to steel frames.

• Building Construction: Lightweight steel structures, metal roofing, or curtain wall installation.

• HVAC & Ventilation: Installation of ducts, brackets, or equipment.

• Automotive & Industrial: Assembly of body sheet metal or machine housings; zinc plating is suitable

  for indoor environments.

• DIY & Repair: Economical and reliable metal connections in home projects.