S-92210A429 5/8"-11 x 2 1/4" ASME B18.3 Stainless Steel Hex Drive Flat Head 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 tensile strength rated at 70,000 psi for heavy-duty applications requiring secure, vibration-resistant fastening
• Precision Class 3A thread fit with UNC coarse threading for faster installation and reduced cross-threading risks
• High torque capability through 3/8" hex drive design, enabling efficient installation with standard tools
• Optimal flush mounting with 82° countersink angle and standard flat head profile for smooth surface finishes
• Full threading along 2-1/4" length provides maximum grip and load distribution across the entire fastener
• Industry compliance assurance meeting ASME B18.3 specifications with RoHS 3 and REACH environmental standards

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 5/8"-11 UNC flat head screws solve critical fastening challenges where corrosion resistance and structural integrity are paramount. The 18-8 stainless steel composition combined with passivated finish creates a protective barrier against chemical exposure and atmospheric corrosion, making them ideal for marine equipment, food processing machinery, and outdoor structures. The coarse UNC thread design ensures rapid assembly in soft materials and castings, while the Class 3A thread fit maintains precise tolerances for vibration-prone environments. The hex drive configuration delivers superior torque transmission compared to slotted alternatives, reducing installation time and tool slippage in confined spaces. These fully threaded fasteners provide consistent clamping force across the entire 2-1/4" length, distributing stress evenly to prevent joint failure in heavy machinery, structural frameworks, and equipment mounting applications.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 standards with Class 3A thread fit tolerance for precision engagement. Features 5/8"-11 UNC coarse threads with right-hand orientation and standard 82° countersink angle. Compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety. Mechanical properties include 70,000 psi tensile strength and Rockwell B55 hardness for durable performance in industrial fastening systems.