S-92198A729 1/2"-13 x 4 1/4" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and outdoor applications.
• Exceptional mechanical strength with 80,000 PSI tensile strength and Rockwell B70 hardness, ensuring reliable performance under high-stress conditions.
• Secure and efficient installation provided by the external hex drive and 3/4" head width, allowing for high torque application with standard tools.
• Optimized thread engagement with UNC coarse threads and Class 2A fit, facilitating faster assembly and reducing cross-threading risks.
• Versatile partial threading design (1-1/4" min thread length on a 4-1/4" shank) for precise clamping force control in various material thicknesses.
• Guaranteed dimensional consistency and interchangeability, manufactured to meet rigorous ASME B18.2.1 specifications.
• Compliant with global environmental standards including RoHS 3 and REACH, ensuring safe use in regulated markets and applications.

Professional Applications & Engineering Value

This 1/2"-13 UNC Hex Head Screw is engineered to solve critical fastening challenges in demanding sectors. The 18-8 Stainless Steel material provides excellent resistance to oxidation and chemical exposure, making it suitable for construction, marine, and food processing equipment where moisture is a concern. Its partially threaded design allows the unthreaded shank to act as a precision pilot, reducing shear stress and improving joint integrity in structural assemblies. The coarse thread profile ensures rapid installation in soft materials or where vibration loosening is a risk, while the external hex drive offers superior torque transmission for high-clamp force requirements. With an 80,000 PSI tensile strength, it reliably replaces lower-grade fasteners in heavy machinery, transportation frameworks, and industrial platforms, delivering long-term durability and reducing maintenance frequency.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC thread with Class 2A thread fit tolerance, ensuring consistent engagement and interchangeability. The dimensional attributes, including a 4-1/4" length and 3/4" head width, adhere to the ASME B18.2.1 standard for hex head cap screws. It is manufactured from 18-8 Stainless Steel with a Rockwell B70 hardness and is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.