S-90398A249 Length 1 1/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with chrome-plated steel construction for extended service life in demanding industrial environments
• Enhanced load distribution through integrated steel flat washer that prevents surface damage and maintains joint integrity
• Optimized thread-forming design creates strong, permanent threads in sheet metal without requiring pre-tapped holes
• Wide truss head profile provides increased bearing surface for superior clamping force and vibration resistance
• Streamlined installation with No. 2 Phillips drive and pointed tip for quick alignment and reduced assembly time
• Full-thread engagement along the entire 1-1/4" length ensures maximum holding power in thin materials
• Precision compatibility with No. 21 drill bits for clean, accurate holes in materials up to 0.025" thickness

Professional Applications & Engineering Value

Engineered specifically for sheet metal applications, these chrome-plated steel tapping screws deliver exceptional performance in HVAC systems, electronic enclosures, and industrial machinery assembly. The thread forming design eliminates the need for separate tapping operations, reducing labor costs and potential cross-threading issues. The A/AB tapping screw type with right-hand threading ensures reliable fastening in materials where traditional screws might strip or loosen. The combination of fully threaded construction and wide truss head with integrated flat washer provides superior resistance to vibration-induced loosening, making them ideal for applications subject to thermal cycling or mechanical stress. The pointed tip facilitates precise starting position while the Phillips drive style offers familiar, efficient installation for maintenance teams.

Specification Summary & Compliance

These No. 10-12 tapping screws feature precise 0.19" thread diameter with 12 threads per inch and comply with standard thread forming specifications for consistent performance. Manufactured to exacting dimensional tolerances with Class 2A thread fit for reliable engagement. The chrome-plated steel construction meets industry standards for corrosion protection, while the integrated steel flat washer (1/2" OD) ensures proper load distribution. Compatible with No. 21 drill bits (0.159" diameter) for optimal hole preparation in materials up to 0.025" maximum drilling thickness. Products conform to relevant industrial fastening standards and environmental regulations.