S-92210A451 1/2"-20 x 2 1/2" 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, providing reliable fastening for high-stress industrial applications.
• Precision Class 3A thread fit for secure, vibration-resistant assemblies and reduced risk of loosening.
• Optimized flush mounting with an 82° countersink angle and standard flat head profile for seamless surface integration.
• Enhanced installation efficiency using a 5/16" hex drive, allowing for high-torque application without slippage.
• Full threading along the 2-1/2" length ensures maximum grip and uniform load distribution across the entire fastener.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and regulatory adherence.

Professional Applications & Engineering Value

Engineered for demanding environments, these 1/2"-20 UNF flat head screws address common industrial challenges such as vibration-induced failure and corrosive degradation. The 18-8 stainless steel material, combined with a passivated finish, provides exceptional resistance to rust and chemicals, making them ideal for machinery, marine equipment, and outdoor structures. The fine thread spacing and Class 3A thread fit enhance grip in softer materials or where precise alignment is critical, reducing the need for frequent maintenance. With a Rockwell B55 hardness and fully threaded design, these screws ensure consistent performance in heavy-duty fastening applications, from assembly lines to construction projects.

Specification Summary & Compliance

This product adheres to Class 3A thread fit tolerances as per UNF (Unified National Fine) standards, ensuring precise thread engagement. Manufacturing follows ASME B18.3 specifications for dimensional accuracy, including head diameter (0.938"), length (2-1/2"), and countersink angle (82°). Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms the absence of hazardous substances, supporting safe use in global industrial supply chains.