S-90385A108 Length 3/8" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Efficient thread forming action creates strong, permanent threads in plastic materials without chips or debris
• Reliable installation performance with Phillips No. 1 drive design that minimizes cam-out and ensures secure fastening
• Optimal material engagement through fully threaded design that maximizes holding power in plastic assemblies
• Streamlined assembly process with pre-determined No. 44 drill bit size (0.086") for precise hole preparation
• Enhanced fastener stability with standard pan head design that provides excellent bearing surface and prevents pull-through
• Industry-standard compatibility meeting ASME B18.6.3 specifications for consistent quality and performance

Professional Applications & Engineering Value

These No. 4-24 thread forming screws deliver exceptional value in plastic assembly applications where traditional fastening methods often fail. The DST thread forming design eliminates the need for tapped holes by displacing material to create strong, load-bearing threads that resist vibration loosening. The zinc-plated steel construction provides essential corrosion protection while maintaining the mechanical strength required for durable plastic-to-plastic and plastic-to-metal joints. With their fully threaded configuration and precise 0.112" thread diameter, these screws distribute clamping force evenly, preventing stress concentration that can lead to plastic cracking or failure. The combination of Phillips drive system and standard pan head ensures compatibility with common assembly tools while providing sufficient bearing surface for secure fastening in electronic enclosures, automotive trim, consumer products, and industrial equipment plastic components.

Specification Summary & Compliance

This tapping screw features a No. 4-24 thread size with Class 2A thread tolerances and right-hand thread direction. The fastener is manufactured to ASME B18.6.3 specifications for dimensional accuracy and performance reliability. Compliance with RoHS 3 (2015/863/EU) ensures environmental responsibility and regulatory adherence for global manufacturing applications. The screw's thread forming (DST type) design requires a No. 44 drill bit (0.086" diameter) for proper installation in plastic materials, with the 3/8" length providing versatile fastening solutions across various material thicknesses.