S-90385A327 Length 1/4" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• Excellent thread retention in plastic materials through DST thread forming technology that creates strong, permanent threads without chips
• Reliable installation and removal with Phillips No. 1 drive that prevents cam-out and ensures consistent torque application
• Optimized plastic fastening performance with 20 TPI thread pitch providing maximum holding power in plastic substrates
• Complete thread engagement with fully threaded 1/4" length for uniform stress distribution and superior pull-out resistance
• Easy alignment and reduced surface marking with rounded pan head design that sits flush against materials
• Precision installation guidance with recommended No. 39 drill bit (0.0995") for proper hole preparation in plastic applications

Professional Applications & Engineering Value

These No. 5 zinc-plated steel tapping screws with DST thread forming technology are engineered specifically for plastic fastening applications where traditional fasteners fail. The thread forming design creates strong, permanent threads in plastic materials without generating chips or debris that could compromise electronic components or moving parts. The zinc-plated steel construction provides essential corrosion protection for industrial environments while maintaining the strength required for durable plastic assemblies. With fully threaded 1/4" length and 20 TPI precision, these screws distribute stress evenly across the entire engagement length, preventing material cracking and ensuring long-term reliability in plastic enclosures, components, and structural elements. The Phillips drive system allows for efficient installation in high-volume production environments.

Specification Summary & Compliance

This No. 5 tapping screw features a 0.125" thread diameter with 20 approximate threads per inch and 1/4" fully threaded length. The product meets ASME B18.6.3 specifications for dimensional accuracy and performance requirements. Manufactured with zinc-plated steel material and rounded pan head profile with 0.219" head diameter, these screws are designed for thread forming applications in plastic materials using recommended No. 39 drill bit (0.0995") for proper hole preparation. The right-hand threaded configuration with blunt tip ensures optimal performance in plastic fastening applications.