S-91772A541 1/4"-20 x 7/8" 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 for extended service life in harsh environments
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
• Optimized drive engagement with No. 3 Phillips drive for secure installation and reduced cam-out risk
• Precision threading with UNC coarse thread and Class 2A fit ensuring consistent engagement and vibration resistance
• Full-threaded design providing maximum grip length and uniform stress 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 for safe use in regulated industries

Professional Applications & Engineering Value

These passivated 18-8 stainless steel pan head screws deliver critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures dependable fastening in structural applications, while the UNC coarse threading provides excellent engagement in various materials. The rounded pan head profile with No. 3 Phillips drive offers both aesthetic appeal and practical installation benefits, making these fully threaded screws ideal for machinery assembly, electrical enclosures, and outdoor equipment where environmental exposure is a concern. The Class 2A thread fit guarantees consistent performance across high-volume production runs.

Specification Summary & Compliance

This 1/4"-20 x 7/8" pan head screw features precision UNC coarse threads with Class 2A thread fit tolerance for reliable engagement. Manufacturing complies with ASME B18.6.3 standards for dimensional accuracy and mechanical properties. The fastener meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, ensuring suitability for industrial applications with strict environmental requirements.