S-90385A107 Length 5/16" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in various environments
• Efficient thread forming design creates strong, permanent threads in plastic materials without pre-tapping
• Secure installation with Phillips drive system providing reliable torque transfer and reduced cam-out risk
• Optimized plastic compatibility featuring blunt tip design to prevent material splitting during installation
• Full thread engagement along the entire 5/16" length for maximum holding power in plastic assemblies
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and performance
• Precision sizing with No. 4-24 thread configuration and compatible with standard No. 44 drill bits

Professional Applications & Engineering Value

This zinc-plated steel tapping screw is specifically engineered for plastic assembly applications where traditional fasteners often fail. The thread forming DST design eliminates the need for pre-tapped holes, creating strong internal threads that resist stripping and back-out in plastic substrates. The Phillips drive system ensures consistent installation torque while the pan head profile provides a low-profile finish ideal for consumer products, electronic enclosures, and automotive plastic components. The blunt tip design prevents material cracking and damage during installation, making it particularly valuable for brittle plastic materials where stress concentration can lead to failure. This combination of features addresses common challenges in plastic fastening applications, providing reliable performance where vibration resistance and long-term integrity are critical.

Specification Summary & Compliance

This No. 4-24 thread forming screw features precision Class 2A thread tolerances with a diameter of 0.112" and 24 threads per inch. Manufactured to meet ASME B18.6.3 standards for dimensional accuracy and performance requirements. The product is RoHS 3 (2015/863/EU) compliant, ensuring environmental regulatory adherence for global manufacturing applications. Designed as a fully threaded DST type tapping screw with right-hand thread direction and compatible with No. 44 drill bits (0.086" diameter) for optimal installation in plastic materials.