S-90385A337 Length 1 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 demanding environments
• Optimized plastic fastening performance through thread-forming DST design that creates strong, secure threads without pre-tapping
• Enhanced driving efficiency with Phillips No. 2 drive that provides reliable torque transfer and reduces cam-out
• Maximum material engagement with fully threaded 19 TPI design and blunt tip for controlled penetration in plastic applications
• Secure seating and professional finish thanks to rounded pan head design that sits flush while distributing clamping force evenly
• Precision compatibility with No. 35 drill bit (0.11" diameter) for perfect hole preparation and optimal thread formation
• Industry-standard reliability meeting ASME B18.6.3 specifications for consistent quality and performance

Professional Applications & Engineering Value

These zinc-plated steel tapping screws deliver exceptional value in plastic fastening applications where material integrity and long-term performance are critical. The thread-forming DST design eliminates the need for separate tapping operations, reducing assembly time and labor costs while creating strong, permanent threads in thermoplastic materials. The combination of 19 TPI precision threading and blunt tip configuration ensures controlled material displacement, preventing cracking or stress concentration in delicate plastic components. The Phillips drive system provides reliable installation with standard tools, making these No. 6 screws ideal for high-volume manufacturing, electrical enclosures, automotive trim, and consumer products where consistent, vibration-resistant fastening is essential.

Specification Summary & Compliance

These 1-1/2 inch tapping screws feature precise Class 2A thread tolerances with 0.138" thread diameter and fully threaded design for maximum engagement. Manufactured to meet ASME B18.6.3 standards, these fasteners ensure dimensional accuracy and performance reliability. The zinc-plated steel construction provides corrosion protection while maintaining compliance with industry requirements for plastic fastening applications. The rounded pan head design with 0.254" head diameter and standard drive compatibility ensures consistent performance across industrial applications.