S-90398A201 Length 1 1/4" Tapping Screws

Key Features & Benefits at a Glance

• Enhanced load distribution with wide truss head and integrated steel washer for superior surface protection and reduced material stress
• Superior corrosion resistance from chrome-plated steel construction ensuring long-term durability in demanding industrial environments
• Optimal installation efficiency with No. 2 Phillips drive and pointed tip design for quick, secure fastening in sheet metal applications
• Exceptional holding power through thread-forming (A/AB) design that creates strong, permanent threads without pre-tapping requirements
• Full-thread engagement along the 1-1/4" length provides maximum pull-out resistance and vibration resistance
• Precision compatibility with No. 29 drill bit (0.136" diameter) for perfect fit in 0.025" maximum thickness sheet metal
• Reliable performance with right-hand threading and fully threaded design ensuring consistent, secure fastening every time

Professional Applications & Engineering Value

These chrome-plated steel tapping screws deliver exceptional engineering value in sheet metal fabrication and assembly operations. The thread-forming A/AB design eliminates the need for separate tapping operations, significantly reducing installation time and labor costs while creating stronger, more reliable threads that resist loosening under vibration. The combination of wide truss head profile and integrated flat steel washer provides superior clamping force distribution, preventing material deformation and ensuring secure fastening in thin-gauge applications. The No. 2 Phillips drive offers excellent torque transmission for efficient installation, while the pointed tip facilitates precise alignment and starting in pre-drilled holes. These sheet metal fasteners are engineered to solve common industrial challenges including vibration-induced loosening, material stress concentration, and corrosion in demanding environments.

Specification Summary & Compliance

These No. 8 x 1-1/4" tapping screws feature precision right-hand threading with approximately 15 threads per inch and fully threaded design for maximum engagement. Manufactured to industry standards for A/AB tapping screw types with thread-forming capability. The fasteners are compatible with No. 29 drill bit (0.136" diameter) and designed for maximum drilling thickness of 0.025". Constructed from chrome-plated steel for enhanced corrosion resistance and durability. Complies with industry standards for dimensional accuracy and performance in sheet metal fastening applications.