S-90272A408 1/4"-28 x 1 1/4" ASME B18.6.3 Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating for extended service life in demanding industrial environments
• Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for heavy-duty fastening applications
• Precise thread engagement with UNF fine threads and Class 2A fit ensuring reliable, vibration-resistant connections
• Optimized drive performance with No. 3 Phillips drive providing secure tool engagement and reduced cam-out risk
• Maximum fastening coverage through fully threaded design for superior grip along the entire screw length
• Broad compatibility with standard pan head profile accommodating various assembly requirements
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards for global industrial use

Professional Applications & Engineering Value

These zinc-plated steel pan head screws with 1/4"-28 UNF fine threads deliver critical performance advantages for industrial assembly applications where vibration resistance and consistent clamping force are paramount. The combination of Rockwell B70 hardness and 60,000 psi tensile strength ensures reliable performance in heavy machinery, automotive components, and electrical enclosures subject to dynamic loads. The fully threaded design maximizes surface contact for superior pull-out resistance, while the zinc plating provides essential corrosion protection in humid or chemically aggressive environments. The Phillips drive system with No. 3 size offers efficient installation with standard tools, making these rounded head screws ideal for production lines requiring both speed and reliability.

Specification Summary & Compliance

This 1/4"-28 x 1-1/4" screw features precise Class 2A thread fit tolerances with UNF fine threading and right-hand thread direction. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, ensuring suitability for global industrial markets and environmentally conscious manufacturing operations.