S-91771A094 3-48 x 3/8" ASME B18.6.3 Stainless Steel Phillips Flat Head 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 with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Precision thread engagement through Class 2A thread fit and UNC coarse threading ensures secure fastening and vibration resistance
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced drive stability with Phillips No. 1 drive system providing consistent torque transmission and reduced cam-out risk
• Full-thread coverage along the 3/8" length maximizes grip strength and distribution across connected materials
• Regulatory compliance assurance meeting ASME B18.6.3 specifications while being RoHS 3 and REACH compliant

Professional Applications & Engineering Value

These 3-48 UNC flat head Phillips screws deliver critical performance advantages in demanding industrial 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 these industrial fasteners ideal for electronics enclosures, marine equipment, food processing machinery, and outdoor infrastructure. The combination of coarse thread spacing and Class 2A thread fit ensures rapid installation while maintaining precise tolerance control, reducing assembly time without compromising joint integrity. The fully threaded design maximizes surface contact area, distributing stress evenly across the entire fastener length to prevent loosening under vibration or thermal cycling. With their 82° countersink angle and flat head profile, these screws provide flush surface mounting that eliminates protrusions in precision assemblies while maintaining aesthetic requirements.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards, these flat head screws feature Class 2A thread fit tolerances with UNC coarse thread spacing for consistent performance. The 3-48 thread size and 3/8" length provide standardized dimensional compatibility across industrial applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety. Mechanical properties include 80,000 psi tensile strength and Rockwell B80 hardness for dependable performance in critical fastening applications.