S-91772A559 1/4"-28 x 3/4" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable, long-term performance
• Precise thread engagement with Class 2A UNF fine threads ensuring secure, vibration-resistant connections
• Optimized drive efficiency featuring Phillips No. 3 drive for quick installation and reduced cam-out risk
• Full-threaded design providing maximum grip length and uniform load distribution across the entire fastener
• Standard-compliant manufacturing meeting ASME B18.6.3 specifications for dimensional accuracy and interchangeability
• Environmental compliance with RoHS 3 and REACH regulations, ensuring safe use in regulated industries

Professional Applications & Engineering Value

This 1/4"-28 pan head machine screw delivers critical performance advantages in demanding applications where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making it ideal for industrial equipment, machinery assembly, and outdoor installations. The UNF fine threading with Class 2A fit ensures precise engagement in tapped holes, reducing the risk of cross-threading while maintaining vibration resistance in dynamic load conditions. Combined with the Phillips No. 3 drive and fully threaded design, this fastener enables efficient installation and consistent clamping force distribution across metal fabrication, automotive components, and electronic enclosures where dimensional stability and regulatory compliance are essential.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent dimensional accuracy. Features UNF 1/4"-28 fine threads with full threading along the 3/4" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring restriction of hazardous substances for industrial applications.