S-92949A877 1/2"-13 x 7/8" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 Stainless Steel construction and a passivated finish, ensuring long-term reliability in harsh environments.
• Exceptional mechanical strength with a 70,000 psi tensile strength and Rockwell B55 hardness for demanding, high-stress applications.
• Precise and secure fastening achieved with a Class 3A thread fit and UNC coarse thread spacing, reducing the risk of cross-threading and ensuring a tight, reliable connection.
• Efficient installation and removal facilitated by the 5/16" hex drive and rounded button head design, allowing for high torque application and a clean, finished appearance.
• Full-length threading provides maximum grip and holding power along the entire 7/8" length, enhancing joint integrity.
• Compliance with major industry standards including ASME B18.3, ensuring dimensional consistency, and RoHS 3 & REACH for environmental safety.
• Durable and reliable performance in industrial settings, backed by the material properties and precise manufacturing standards.

Professional Applications & Engineering Value

This 18-8 Stainless Steel Rounded Head Screw is engineered to solve critical challenges in industrial assembly and machinery. Its high tensile strength (70,000 psi) and Rockwell B55 hardness make it ideal for applications subject to vibration and heavy loads, preventing joint failure. The passivated finish on the stainless steel provides an extra layer of protection against corrosion, which is essential in moist or chemically aggressive environments. The combination of a UNC coarse thread and Class 3A fit ensures quick assembly with minimal risk of stripping, while the hex drive allows for efficient installation in confined spaces. This fastener delivers reliable performance in construction, automotive, and heavy equipment applications where durability and compliance are non-negotiable.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC thread with coarse spacing and a precise Class 3A thread fit for consistent, high-tolerance fastening. The dimensions, including a 7/8" length and 0.875" head diameter, conform to the ASME B18.3 specification. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.