S-90385A106 Length 1/4" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior plastic material compatibility with thread forming design that creates strong, permanent threads without chipping or cracking plastic components
• Enhanced corrosion resistance through zinc plating that protects against environmental exposure in industrial applications
• Optimized installation efficiency with Phillips No. 1 drive that provides secure tool engagement and prevents cam-out during assembly
• Maximum holding power achieved through full threading along the entire 1/4" length for superior pull-out resistance
• Damage prevention with blunt tip design that eliminates risk of piercing through plastic materials during installation
• Precision fit assurance with recommended No. 44 drill bit (0.086") for perfect hole preparation in plastic assemblies
• Reliable performance standardization meeting ASME B18.6.3 specifications for consistent quality and dimensional accuracy

Professional Applications & Engineering Value

This No. 4-24 zinc-plated steel tapping screw delivers exceptional engineering value for plastic assembly applications where material integrity and long-term reliability are critical. The thread forming (DST) design creates durable mating threads in plastic substrates without generating chips, eliminating contamination risks in sensitive assemblies. The Phillips pan head configuration provides low-profile fastening with excellent drive torque transmission, while the fully threaded shank ensures uniform stress distribution across the entire engagement length. Engineered specifically for plastic fabrication, this screw's blunt tip prevents material splitting and the zinc-plated steel construction offers reliable corrosion protection in various industrial environments, making it ideal for electronics enclosures, automotive trim, and consumer product assemblies where plastic-to-plastic or plastic-to-metal connections require secure, vibration-resistant fastening solutions.

Specification Summary & Compliance

This No. 4-24 x 1/4" tapping screw features precision right-hand threads with 24 threads per inch and meets ASME B18.6.3 dimensional standards for consistent performance. The screw maintains proper Class 2A thread tolerances and is manufactured from zinc-plated steel for durability. Compliance with RoHS 3 (2015/863/EU) regulations ensures environmental safety, while the DST thread forming design follows established engineering specifications for plastic fastening applications. The product is designed for use with No. 44 drill bit (0.086" diameter) for optimal hole preparation in plastic materials.