S-91772A111 4-40 x 9/16" 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 load-bearing performance
• Wide compatibility through UNC coarse threading and Class 2A fit, ensuring easy installation and secure fastening
• Optimized drive engagement with Phillips No. 1 drive style, reducing cam-out risks during high-torque applications
• Full-threaded design providing maximum grip length and uniform stress distribution along the entire fastener
• Regulatory compliance meeting ASME B18.6.3 specifications and international RoHS 3/REACH standards for global supply chain integration
• Versatile pan head profile offering low-profile seating and improved aesthetics without compromising structural integrity

Professional Applications & Engineering Value

Engineered for precision assembly requirements, these 4-40 UNC pan head screws deliver critical performance advantages in industrial fastening systems. The passivated 18-8 stainless steel construction provides inherent resistance to oxidation and chemical degradation, making these Phillips drive screws ideal for electrical enclosures, machinery panels, and automotive components exposed to moisture or temperature variations. The coarse thread configuration ensures rapid installation in sheet metal, plastic housings, and pre-tapped holes, while the fully threaded design maintains consistent clamping force across varying material thicknesses. With 70,000 psi tensile strength, these fasteners prevent joint failure in high-vibration environments, reducing maintenance intervals and improving operational reliability for OEMs and MRO specialists.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 dimensional standards with Class 2A thread fit tolerances for consistent interchangeability. Compliant with RoHS 3 (2015/863/EU) hazardous substance restrictions and REACH (EC 1907/2006) chemical safety protocols. Thread specifications adhere to 4-40 UNC coarse thread parameters with right-hand orientation and full threading along the 9/16" length.