S-90604A551 4-40 x 3/16" 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 and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength delivering 100,000 psi tensile strength and Rockwell B100 hardness for reliable load-bearing performance
• Versatile installation options with combined Phillips/Slotted drive (No. 1 size) for flexible tool compatibility
• Precision threading with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
• Optimized head design featuring rounded pan profile for reduced surface protrusion and improved aesthetics
• Full regulatory compliance meeting ASME B18.6.3 standards and RoHS/REACH environmental requirements
• Complete thread coverage along the 3/16" length for maximum grip strength in thin materials

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 4-40 UNC rounded head screws provide critical solutions where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel construction with passivated finish creates a protective oxide layer that significantly extends service life in moisture-prone environments. The combination of Phillips/Slotted drive accommodates various installation tools while maintaining torque transmission efficiency. With coarse threading and Class 2A thread fit, these fasteners deliver superior engagement in softer materials and prevent cross-threading during assembly. The pan head design offers an optimal balance between low-profile installation and sufficient drive engagement, making them ideal for electronics enclosures, machinery panels, and precision equipment where both performance and aesthetics matter.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with Class 2A thread tolerance for consistent fit and performance. Features UNC coarse threads (4-40) with right-hand direction and full threading across the 3/16" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries including electronics, automotive, and industrial machinery applications.