S-90627A124 Length 1/2" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black zinc-plated steel construction for extended service life in demanding environments
• Optimized thread forming technology (DST type) creates strong, permanent threads in plastic materials without chipping or cracking
• High-torque Phillips No. 2 drive provides secure installation and prevents cam-out during assembly operations
• 18 threads per inch precision ensures consistent, reliable fastening with maximum holding power in plastic substrates
• Fully threaded blunt tip design allows for smooth insertion and eliminates the need for pre-drilled pilot holes in many applications
• Standard pan head profile with 0.27" diameter provides excellent bearing surface for secure fastening without sinking
• Industry-standard compliance with ASME B18.6.3 ensures consistent quality and interchangeability across industrial applications

Professional Applications & Engineering Value

These No. 8 x 1/2" tapping screws are specifically engineered for plastic assembly applications where traditional fastening methods often fail. The thread forming DST technology eliminates common issues like material stress cracking and thread stripping by displacing plastic material rather than cutting it. The black zinc-plated steel construction provides essential corrosion protection while maintaining the screw's structural integrity. With their fully threaded design and 18 TPI precision, these screws distribute clamping force evenly, preventing localized stress points that can lead to plastic deformation or failure. The Phillips drive system ensures reliable installation in high-volume production environments, making them ideal for automotive trim, electronic enclosures, and consumer product assemblies where vibration resistance and long-term performance are critical.

Specification Summary & Compliance

This thread forming screw features precise dimensional accuracy with a 0.164" thread diameter and 1/2" length, manufactured to ASME B18.6.3 specifications for consistent performance. The DST thread forming design operates with a recommended No. 30 drill bit (0.1285" diameter) for optimal thread engagement in plastic materials. The black zinc-plated surface treatment meets industry standards for corrosion protection, while the right-hand threading and standard pan head configuration ensure compatibility with existing assembly processes and tools.