S-90399A199 Length 1" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-phosphate steel coating, extending service life in demanding metalworking environments
• Enhanced load distribution through wide truss head design, preventing material pull-through in thin sheet metal applications
• Integrated steel flat washer provides immediate sealing surface and eliminates separate washer installation steps
• Precision thread forming design creates strong, permanent threads in sheet metal without requiring pre-tapped holes
• Optimized drive engagement with No. 2 Phillips drive prevents cam-out and ensures secure fastening control
• Full threading with pointed tip enables quick starting and smooth penetration through sheet metal substrates
• Industry-standard A/AB tapping screw specification ensures reliable performance and interchangeability

Professional Applications & Engineering Value

These heavy-duty tapping screws are specifically engineered for sheet metal applications where vibration resistance and permanent fastening are critical. The black-phosphate steel construction provides excellent corrosion protection in industrial environments, while the thread forming design creates durable, high-strength connections without compromising material integrity. The combination of Phillips drive and truss head profile offers superior torque transmission and clamping force distribution, making these No. 8 screws ideal for HVAC systems, electrical enclosures, automotive panels, and metal fabrication projects. The integrated steel flat washer eliminates the need for separate components while providing consistent surface contact and preventing galvanic corrosion.

Specification Summary & Compliance

These tapping screws feature precision 0.164" thread diameter with 15 threads per inch and comply with A/AB tapping screw standards. The fully threaded design with right-hand thread direction ensures maximum holding power. Manufacturing specifications include Class 2A thread tolerances and compatibility with No. 29 drill bit (0.136" diameter) for optimal performance in materials up to 0.025" maximum drilling thickness. The 1/2" OD steel flat washer is permanently attached for consistent performance. These industrial fasteners meet relevant industry standards for metalworking screws and comply with RoHS and REACH environmental requirements.