S-90604A539 1/4"-20 x 5/8" 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 for long-lasting performance in harsh environments
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable heavy-duty applications
• Precision thread engagement through Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
• Versatile installation options with combined Phillips/slotted drive and No. 3 drive size for flexible tool compatibility
• Optimized load distribution from the pan head design providing superior clamping force and surface contact
• Full thread coverage along the entire 5/8" length for maximum grip strength and adjustment flexibility
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

These 18-8 stainless steel pan head screws deliver critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The passivated finish significantly enhances the natural corrosion resistance of stainless steel, making these fully threaded screws ideal for applications 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 resisting vibration-induced loosening. The combination of Phillips/slotted drive provides installation flexibility for maintenance and production scenarios, while the rounded pan head design offers excellent bearing surface for consistent clamping force. These characteristics make them particularly valuable in machinery assembly, electrical enclosures, and structural frameworks where long-term reliability and regulatory compliance are essential considerations.

Specification Summary & Compliance

This 1/4"-20 x 5/8" pan head screw features precision UNC coarse threads manufactured to Class 2A tolerance standards, ensuring consistent fit and performance. The product fully complies with ASME B18.6.3 mechanical and dimensional specifications, guaranteeing interchangeability and reliability. Environmental compliance is confirmed through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, making these screws suitable for regulated industrial applications worldwide. The combination of 18-8 stainless steel material with passivated surface treatment provides optimal corrosion resistance while maintaining the mechanical properties required for demanding fastening applications.