S-90385A194 Length 1/2" 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
• Efficient thread forming design creates strong, permanent threads in plastic without pre-drilling or tapping
• Optimized for plastic materials with DST thread profile that prevents material cracking and ensures secure fastening
• Easy installation and removal with Phillips No. 2 drive that provides excellent torque transfer and reduces cam-out
• Maximum holding power through fully threaded design that distributes load evenly along the entire screw length
• Standardized dimensions and compliance with ASME B18.6.3 ensures consistent performance and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated applications

Professional Applications & Engineering Value

These zinc-plated steel tapping screws are specifically engineered for plastic assembly applications where traditional fasteners often fail. The thread forming DST design displaces plastic material rather than cutting it, creating zero clearance fit that eliminates loosening from vibration. The Phillips drive system ensures reliable installation in automated assembly lines while the pan head configuration provides a low-profile finish ideal for consumer products and electronic enclosures. With 18 threads per inch and blunt tip design, these screws prevent material stress concentration that can lead to cracking in brittle plastics. The combination of zinc plating and steel substrate delivers the perfect balance of corrosion resistance and mechanical strength for industrial plastic fastening requirements.

Specification Summary & Compliance

This No. 8 x 1/2" tapping screw features precise dimensional accuracy with 0.164" thread diameter and 18 threads per inch in right-hand orientation. Manufactured to ASME B18.6.3 specifications for consistent quality and performance. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries. Designed for use with No. 30 drill bit (0.1285" diameter) when pilot holes are required in harder plastic materials.