S-90604A331 1/4"-20 x 2 1/2" ASME B18.6.3 Stainless Steel Pan Head Combination Phillips/Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength delivering 100,000 psi tensile strength and Rockwell B100 hardness for demanding industrial applications
• Versatile installation options with combined Phillips/slotted drive for flexible tool compatibility and reduced fastener inventory
• Reliable thread engagement through fully threaded UNC coarse design and Class 2A fit for secure fastening in various materials
• Optimized head design featuring rounded pan profile for reduced surface protrusion and improved aesthetic integration
• Regulatory compliance assurance meeting ASME B18.6.3 standards while being RoHS 3 and REACH compliant for global applications
• Enhanced durability through precise manufacturing controls ensuring consistent performance across production runs

Professional Applications & Engineering Value

This 1/4"-20 x 2-1/2" rounded head screw delivers critical engineering advantages for industrial assembly challenges. The 18-8 stainless steel composition with passivated finish provides exceptional resistance to corrosion and chemical exposure, making it ideal for marine, food processing, and outdoor equipment applications. The UNC coarse thread configuration ensures rapid installation and superior holding power in both metallic and non-metallic substrates. The dual Phillips/slotted drive system accommodates various tooling scenarios while minimizing cam-out risks. With full threading along the 2-1/2" length, this fastener maintains consistent clamping force across the entire engagement area, preventing loosening under vibration and thermal cycling conditions common in machinery and structural assemblies.

Specification Summary & Compliance

This industrial-grade fastener maintains precise Class 2A thread fit tolerances per UNC standards, ensuring consistent engagement and load distribution. Manufacturing adheres to ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The screw demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming suitability for international markets and sensitive applications. Thread configuration follows 1/4"-20 coarse thread specifications with complete threading along the entire shank length, while the rounded pan head design provides standardized installation characteristics across industrial fastener systems.