S-91737A054 2-56 x 3/8" ASME B18.6.3 Stainless Steel Fillister Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength delivering 80,000 psi tensile strength and Rockwell B85 hardness for reliable load-bearing performance
• Optimized drive engagement through Phillips No. 1 drive design preventing cam-out and ensuring secure installation
• Enhanced clearance capability with high, narrow Fillister head profile allowing deeper tool access in confined spaces
• Precision threading reliability featuring UNC coarse threads with Class 2A fit for consistent engagement and vibration resistance
• Full-length threading versatility enabling maximum grip along the entire 3/8" length for diverse fastening applications
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This 2-56 UNC rounded head screw delivers critical engineering solutions where corrosion resistance and high-strength fastening are paramount. The 18-8 stainless steel composition, enhanced by passivated surface treatment, provides exceptional protection against chemical exposure and atmospheric corrosion in industrial settings. The Fillister head design with Phillips drive offers superior torque transmission while the coarse UNC threading ensures rapid installation and reliable performance in vibration-prone applications. These fully threaded screws are engineered for precision assembly in electronics, machinery, and equipment manufacturing where Class 2A thread fit guarantees consistent mating with tapped holes. The combination of 80,000 psi tensile strength and Rockwell B85 hardness makes these industrial fasteners ideal for demanding mechanical applications requiring durable, long-lasting connections.

Specification Summary & Compliance

Manufactured to exacting dimensional tolerances with Class 2A thread fit per UNC standards, ensuring precision mating with corresponding threaded components. Complies with ASME B18.6.3 mechanical specifications for screw geometry and performance requirements. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) compliance for chemical safety. The right-hand threaded design with coarse thread spacing provides optimal engagement characteristics for industrial fastening applications.