S-91771A635 3/8"-16 x 2 3/4" 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 tensile strength rated at 80,000 psi ensures reliable performance under high-stress applications
• Precise Class 2A thread fit guarantees smooth installation and secure fastening in UNC coarse thread applications
• Optimized Phillips No. 4 drive provides efficient torque transmission and reduced cam-out during installation
• 82° countersink angle design enables flush mounting for clean, professional finishes in various materials
• Partial threading configuration offers superior clamping force where full thread engagement isn't required
• Full regulatory compliance with ASME B18.6.3, RoHS 3, and REACH standards for quality assurance and environmental safety

Professional Applications & Engineering Value

These 3/8"-16 UNC flat head Phillips screws deliver exceptional engineering value through their passivated 18-8 stainless steel composition and precision manufacturing. The corrosion-resistant properties make them ideal for demanding industrial environments where moisture, chemicals, or outdoor exposure are concerns. The coarse UNC threading provides excellent holding power in softer materials while resisting vibration-induced loosening. With Rockwell B80 hardness and 80,000 psi tensile strength, these fasteners maintain structural integrity under significant mechanical stress. The partially threaded design ensures optimal clamping force distribution, while the standard flat head profile with 82° countersink creates seamless surface finishes in machinery, equipment assembly, and structural applications where both strength and aesthetics matter.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances with UNC coarse threading (3/8"-16) and partial threading configuration. Complies with ASME B18.6.3 manufacturing specifications for dimensional accuracy and performance. Meets RoHS 3 (2015/863/EU) compliance for hazardous substance restriction and REACH (EC 1907/2006) regulations for chemical safety. Features include 2 3/4" length, 1 1/2" minimum thread length, and standard flat head profile with 82° countersink angle for industrial-grade performance.