S-91737A259 1/4"-20 x 1" 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, ideal for harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable, long-term performance
• Optimized drive engagement through Phillips No. 3 drive design, ensuring secure installation and reduced cam-out risk
• Precision thread fit with Class 2A UNC coarse threads providing consistent engagement and vibration resistance
• Enhanced head design featuring a high, narrow fillister profile for improved tool clearance in confined spaces
• Full threading capability along the entire 1" length, offering maximum fastening flexibility across various material thicknesses
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

This 1/4"-20 rounded fillister head screw delivers critical engineering advantages for industrial assembly applications where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 stainless steel material and passivated surface treatment creates a robust barrier against oxidation and chemical exposure, significantly extending service life in demanding environments. The high, narrow fillister head profile provides superior clearance for tools in tight spaces while maintaining substantial bearing surface. With UNC coarse threading and Class 2A fit, these fully threaded screws ensure rapid installation and secure fastening across various material densities, from machinery components to electronic enclosures. The Phillips No. 3 drive system offers familiar, efficient installation while the 80,000 psi tensile strength guarantees structural integrity under sustained loads.

Specification Summary & Compliance

This precision-engineered rounded head screw features 1/4"-20 UNC coarse threads with Class 2A dimensional tolerance for consistent fit and performance. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations regarding chemical management, ensuring environmental responsibility in industrial applications.