S-90385A318 Length 1/2" 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 industrial environments
• Efficient thread forming action with DST technology creates strong, permanent threads in plastic materials without chips or debris
• Optimized plastic fastening performance with 28 TPI precision threading for secure, vibration-resistant connections
• Quick installation and removal with Phillips No. 1 drive design providing reliable torque transfer and tool engagement
• Versatile rounded pan head profile offers low-profile installation while distributing clamping force evenly
• Consistent dimensional accuracy ensures reliable performance across high-volume plastic assembly operations
• Reduced assembly time and cost with pre-determined 5/64" drill bit size for simplified hole preparation

Professional Applications & Engineering Value

These No. 3 zinc-plated steel tapping screws deliver exceptional value in plastic assembly applications where traditional fastening methods often fail. The DST thread forming technology eliminates common issues like material cracking and stress concentration by displacing plastic material rather than cutting it, creating stronger thread engagement with up to 30% higher pull-out resistance compared to conventional screws. The fully threaded design with 0.099" thread diameter and 28 TPI precision ensures maximum holding power in thermoplastics, composites, and other plastic substrates. The zinc-plated finish provides essential corrosion protection for electronics enclosures, automotive components, and industrial equipment exposed to moderate environmental conditions, while the rounded pan head with Phillips No. 1 drive facilitates efficient installation in confined spaces common to plastic product assembly lines.

Specification Summary & Compliance

These thread forming screws feature precise Class 2A thread tolerances with right-hand threading and 1/2" length dimensions. Manufacturing complies with ASME B18.6.3 specifications for dimensional consistency and performance reliability. The zinc-plated steel material meets industry standards for corrosion resistance, while the DST thread forming design ensures optimal performance in plastic substrates when used with the recommended 5/64" drill bit size (0.0781" diameter). All components conform to RoHS and REACH environmental compliance requirements for use in regulated industries.