S-90604A565 1/4"-20 x 1/4" ASME B18.6.3 Stainless Steel Pan Head Combination Phillips/Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 Stainless Steel and passivated finish, ideal for harsh industrial environments.
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable, long-term fastening.
• Versatile installation options with combined Phillips/Slotted drive (No. 3 size) for flexible tool use and efficient assembly.
• Precise thread engagement with Class 2A UNC coarse threads ensuring consistent fit and reduced cross-threading risk.
• Broad regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for safe, quality-assured procurement.
• Optimized head design featuring a rounded pan profile for a finished appearance and reduced surface snagging.
• Full-threaded construction providing maximum grip and load distribution along the entire 1/4" length.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this 1/4-20 UNC Rounded Head Screw delivers critical performance where corrosion resistance and structural integrity are paramount. The 18-8 Stainless Steel material, enhanced by a passivated finish, combats oxidation in moisture-rich or chemical-exposed settings, such as marine equipment, food processing machinery, and outdoor structures. Its coarse thread spacing and Class 2A thread fit enable quick assembly and secure fastening in softer materials or where vibration resistance is needed. The dual Phillips/Slotted drive accommodates various tools, streamlining maintenance and reducing downtime. By integrating high tensile strength with standardized UNC threading, this screw solves common failure points—ensuring reliability in mechanical assemblies, electrical enclosures, and fabricated metal products.

Specification Summary & Compliance

This screw maintains precise Class 2A thread fit per UNC standards with a diameter of 0.25" and coarse thread spacing. Manufacturing adheres to ASME B18.6.3 specifications, ensuring dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting environmentally responsible sourcing for global supply chains.