S-90585A548 1/4"-20 x 1 3/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction with passivated surface treatment
• Exceptional mechanical reliability with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precision thread engagement with Class 3A fit and UNC coarse threads ensuring vibration resistance and secure fastening
• Optimal flush mounting with standard 82° countersink angle and flat head design for smooth surface finishes
• Efficient installation using standard 5/32" hex drive tools, reducing assembly time and labor costs
• Full-length threading providing consistent grip along the entire 1-3/4" length for maximum holding power
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards (RoHS 3, REACH)

Professional Applications & Engineering Value

These 1/4"-20 UNC flat head screws deliver critical performance advantages in demanding industrial environments where corrosion resistance and structural integrity are paramount. The combination of 316 stainless steel material and passivated finish provides exceptional protection against chemical exposure, saltwater, and extreme temperatures, making them ideal for marine equipment, chemical processing plants, and food processing machinery. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of loosening under vibration while the 82° countersink angle creates seamless flush mounting in precision assemblies. With full threading along the entire length, these screws distribute clamping force evenly, preventing material distortion in sensitive applications from electronic enclosures to structural frameworks.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 3A thread fit and UNC coarse thread profile (1/4"-20), these flat head screws maintain precision tolerances for reliable performance. The manufacturing process adheres to ASME B18.3 specifications for dimensional consistency and mechanical properties. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, ensuring restricted substance compliance for global industrial applications. The complete specification includes right-hand threading, standard flat head profile, and full compliance with industrial fastening standards.