S-91771A892 3-48 x 5/8" 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, ideal for harsh industrial environments
• Exceptional holding power with 80,000 PSI tensile strength and Rockwell B80 hardness for reliable fastening in demanding applications
• Precise flush installation featuring an 82° countersink angle and undercut flat head design for seamless surface finishing
• Optimized drive efficiency with Phillips No. 1 drive system ensuring secure tool engagement and reduced cam-out risk
• Consistent thread performance through Class 2A thread fit and UNC coarse threading for easier alignment and vibration resistance
• Full-threaded reliability providing maximum grip length and uniform load distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and international environmental standards

Professional Applications & Engineering Value

These 3-48 UNC flat head screws deliver critical engineering advantages in industrial settings where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against chemical exposure and environmental degradation, while the 82° countersink angle with undercut head profile ensures perfect flush mounting in precision machinery and equipment assemblies. The combination of coarse UNC threading and Class 2A thread fit facilitates rapid installation in manufacturing lines while maintaining vibration resistance in dynamic applications. With full threading extending the entire 5/8" length, these Phillips drive screws offer superior pull-out strength for critical joints in automotive, aerospace, and industrial machinery where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerances ensuring precise interchangeability. Fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety. Thread specifications include 3-48 UNC coarse thread with right-hand direction, while mechanical properties guarantee 80,000 PSI tensile strength and Rockwell B80 hardness for consistent performance across industrial applications.