S-92949A879 1/2"-13 x 2 3/4" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance thanks to the 18-8 stainless steel material and passivated finish, ensuring long-term reliability in harsh environments.
• Superior load-bearing capability with a high tensile strength of 70,000 psi, providing dependable performance in demanding applications.
• Precise and secure fastening achieved through Class 3A thread fit and UNC coarse threads, minimizing the risk of loosening under vibration.
• Easy installation and removal with the 5/16" hex drive, allowing for high torque application without stripping the drive.
• Enhanced durability and wear resistance from the Rockwell B55 hardness, maintaining thread integrity over repeated use.
• Full regulatory compliance with ASME B18.3, ASTM F879, RoHS 3, and REACH, ensuring safety and environmental standards are met for global supply chains.
• Versatile rounded button head design that offers a low-profile, finished appearance while reducing the risk of snagging in industrial settings.

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw is engineered to address critical challenges in industrial fastening, such as corrosion, high-stress loads, and vibration-induced failure. The combination of UNC coarse threads and a Class 3A thread fit ensures quick assembly and a tight, reliable hold in materials like metal and heavy plastics, reducing installation time and maintenance needs. The passivated finish significantly enhances corrosion resistance, making it ideal for applications in chemical processing, marine equipment, and outdoor machinery where exposure to moisture and chemicals is common. With its hex drive design, it allows for efficient torque transfer, preventing slippage during high-force applications. Fully threaded for maximum grip, this screw provides consistent clamping force, essential for structural assemblies, heavy-duty machinery, and transportation equipment that demand long-lasting, high-strength fasteners.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and superior thread engagement. It conforms to ASME B18.3 and ASTM F879 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing it is free from hazardous substances and safe for use in various industrial and international markets.