S-90550A750 1/4"-20 x 1" ASME B18.3, ASTM F879, MIL-DTL-18240 Venting Stainless Steel Hex-Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
• Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
• Vented design with 0.062" diameter prevents pressure buildup and allows for easier installation in sealed applications
• 82° countersink angle provides flush seating for clean, professional finishes in visible applications
• Hex drive (5/32") compatibility enables high-torque installation with standard tools, reducing assembly time
• Full threading along 1" length maximizes grip strength and load distribution across the entire fastener
• Compliance with major industrial standards including ASME B18.3, MIL-DTL-18240, and ASTM F879 for guaranteed quality

Professional Applications & Engineering Value

These 1/4-20 UNC flat head screws deliver exceptional engineering value in demanding industrial environments where reliability is paramount. The 18-8 stainless steel composition provides excellent resistance to corrosion and oxidation, making them ideal for marine, chemical processing, and outdoor applications. The vented design specifically addresses pressure equalization challenges in sealed assemblies, preventing fluid or air lock during installation. With coarse UNC threading and Class 3A thread fit, these fasteners maintain secure connections in high-vibration machinery, automotive components, and electrical enclosures. The 82° countersink angle ensures seamless integration with standard chamfered holes, while the hex drive configuration allows for efficient installation in confined spaces common in manufacturing and maintenance operations.

Specification Summary & Compliance

These flat head screws feature precise 1/4"-20 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufacturing complies with ASME B18.3 specifications, ASTM F879 standards, and MIL-DTL-18240 requirements for consistent quality. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use across global industrial markets.