S-90380A108 Length 3/8" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Exceptional holding power in plastic materials thanks to TRS thread forming technology that creates strong, permanent threads without chips
• Reduced installation torque and stripping risk with tri-lobe shank design that displaces material efficiently during driving
• Reliable drive engagement with Phillips No. 1 drive style for secure fastening and reduced cam-out
• Complete thread engagement with fully threaded 20 TPI design ensuring maximum grip along the entire fastener length
• Broad compatibility with standard No. 37 drill bits (0.104" diameter) for simplified installation processes
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe use in industrial applications

Professional Applications & Engineering Value

These zinc-plated steel TRS tapping screws deliver exceptional performance in plastic assembly applications where traditional fastening methods often fail. The thread forming design eliminates chip formation during installation, preventing contamination in sensitive electronic enclosures, automotive components, and consumer products. The tri-lobe shank cross-section progressively forms mating threads in thermoplastic materials, distributing stress evenly to prevent material cracking while providing vibration-resistant locking action. With fully threaded precision and 20 TPI configuration, these screws maintain consistent clamping force across the entire engagement length, crucial for maintaining seal integrity in housing assemblies. The Phillips drive system ensures reliable torque transmission while the rounded pan head profile provides a finished appearance without sharp edges.

Specification Summary & Compliance

This No. 4 x 3/8" tapping screw features inch system measurements with Class 2A thread tolerances for consistent performance. The fastener employs TRS (Thread Rolling Screw) thread forming technology specifically engineered for plastic materials, with right-hand threading and blunt tip for controlled penetration. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and restricted substance compliance for global industrial applications. The zinc-plated steel construction provides corrosion protection while maintaining the mechanical properties required for reliable plastic fastening applications.