S-90385A110 Length 1/2" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior plastic retention with DST thread forming design that creates strong, permanent threads without chips
• Enhanced corrosion resistance through zinc-plated steel construction for extended service life in industrial environments
• Optimized drive efficiency with No. 1 Phillips drive providing secure torque transfer and reduced cam-out risk
• Maximum holding power achieved through fully threaded design along the entire 1/2" length
• Simplified installation with blunt tip and standard pan head profile for easy alignment and consistent seating
• Precision compatibility with No. 44 drill bit (0.086") for proper hole sizing in plastic applications
• Reliable performance backed by ASME B18.6.3 specifications and RoHS 3 compliance for quality assurance

Professional Applications & Engineering Value

These No. 4-24 thread forming screws deliver exceptional value in plastic fastening applications where traditional threading methods fall short. The DST thread forming technology eliminates the risk of plastic cracking or stress fractures by displacing material rather than cutting it, creating stronger, more reliable threads that withstand vibration and thermal cycling. The zinc-plated steel construction provides essential corrosion protection while maintaining the necessary tensile strength for demanding industrial environments. With 24 threads per inch and fully threaded design, these screws distribute clamping force evenly, preventing material distortion in delicate plastic assemblies. The combination of Phillips drive and pan head profile ensures consistent installation torque and flush seating, making them ideal for automated assembly processes in electronics enclosures, automotive components, and consumer products where plastic fastening reliability is critical.

Specification Summary & Compliance

This thread forming screw features precise No. 4-24 thread specifications with standard Class 2A tolerance, ensuring consistent performance across production runs. The 1/2" length and fully threaded shank provide maximum engagement in plastic materials. Manufactured in compliance with ASME B18.6.3 mechanical and dimensional standards, these screws guarantee interchangeability and reliability. Environmental compliance includes RoHS 3 (2015/863/EU) certification, making them suitable for global industrial applications requiring restricted substance control. The specified No. 44 drill bit (0.086" diameter) ensures proper hole preparation for optimal thread formation and holding strength in plastic substrates.