S-90627A111 Length 1/4" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black zinc-plated steel construction, extending service life in demanding environments
• Efficient thread forming technology creates strong, permanent threads in plastic materials without chip formation
• Optimized plastic fastening performance with 24 TPI precision threads for secure, vibration-resistant connections
• Quick installation and driver compatibility through Phillips No. 1 drive style, reducing assembly time and tool requirements
• Precise drilling alignment with blunt tip design specifically engineered for No. 44 drill bit compatibility
• Maximum thread engagement through fully threaded design, ensuring consistent holding power along the entire fastener length
• Industry-standard compliance with ASME B18.6.3 specifications, guaranteeing consistent quality and reliability

Professional Applications & Engineering Value

These thread forming screws are specifically engineered for plastic assembly applications where traditional fastening methods often fail. The DST (Thread Forming) design eliminates material chipping and stress concentration points common in plastic components, creating strong, reliable threads that withstand vibration and thermal cycling. The black zinc-plated steel construction provides essential corrosion protection in industrial environments, while the Phillips pan head design offers excellent driver engagement and a low-profile appearance. With precise 24 TPI threading and No. 44 drill bit compatibility, these screws ensure proper hole preparation and prevent plastic cracking during installation, making them ideal for electronic enclosures, automotive trim, and consumer product assemblies where material integrity is critical.

Specification Summary & Compliance

This No. 4 x 1/4" thread forming screw features standard inch measurements with Class 2A thread tolerances for consistent performance. The fastener meets all requirements of ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Manufactured from quality steel with black zinc plating for corrosion resistance, the screw features a right-hand thread direction and fully threaded design for maximum holding power. Compliance with industry standards ensures reliable performance in plastic fastening applications, with the blunt tip specifically designed for use with standard No. 44 drill bits to prevent material damage during installation.