S-90604A537 1/4"-20 x 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
• Dual-drive convenience with Phillips/slotted head (No. 3 drive) for flexible installation using standard tools
• Precision thread engagement with Class 2A UNC coarse threads providing reliable fastening and vibration resistance
• Full-threaded design maximizing grip length and load distribution across the entire fastener
• Regulatory compliance meeting ASME B18.6.3 standards and environmental regulations (RoHS 3, REACH) for global industrial use
• Optimized pan head profile offering excellent bearing surface while maintaining low-profile installation

Professional Applications & Engineering Value

These 18-8 stainless steel pan head screws deliver critical performance advantages for industrial assembly applications where corrosion resistance and mechanical reliability are paramount. The combination of passivated finish and 100,000 psi tensile strength makes them ideal for machinery, electrical enclosures, and structural components exposed to moisture, chemicals, or outdoor conditions. The UNC coarse thread configuration with Class 2A fit ensures rapid installation and secure fastening in various materials, while the dual Phillips/slotted drive options provide installation flexibility for production lines or maintenance scenarios. The fully threaded design maximizes pull-out resistance, making these rounded head screws particularly valuable in applications requiring consistent clamping force across the entire fastener length.

Specification Summary & Compliance

This 1/4"-20 x 1/2" pan head screw features precision UNC coarse threads with Class 2A thread fit tolerance for consistent engagement. Manufacturing complies with ASME B18.6.3 specifications, ensuring dimensional accuracy and performance reliability. The fastener meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, making it suitable for regulated industrial applications worldwide. The right-hand thread direction and standard pan head profile provide familiar installation characteristics while maintaining optimal performance in demanding environments.