S-92949A878 1/2"-13 x 2 1/4" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• Superior load-bearing capability thanks to 70,000 psi tensile strength and Rockwell B55 hardness, providing dependable performance under heavy stress.
• Precise, secure fastening with Class 3A thread fit and UNC coarse threads, minimizing the risk of loosening in demanding applications.
• Easy installation and removal featuring a 5/16" hex drive and rounded button head design, allowing for efficient tool engagement and reduced installation time.
• Full-thread engagement along the entire 2-1/4" length, offering maximum grip and uniform stress distribution in assembled components.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring product safety and regulatory adherence for global supply chains.
• Durable, low-profile design with a standard rounded head profile that resists snagging and provides a clean, finished appearance.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this 18-8 stainless steel rounded head hex screw addresses critical challenges in machinery assembly, structural frameworks, and corrosive environments. The combination of UNC coarse threads and Class 3A thread fit ensures rapid installation and vibration resistance, reducing maintenance needs in dynamic systems. The passivated finish significantly enhances corrosion resistance, making it ideal for outdoor equipment, marine hardware, and chemical processing plants where moisture and chemicals are prevalent. With full threading along its 2-1/4" length, it provides consistent clamping force, preventing joint failure in high-stress scenarios. These screws are trusted in construction, automotive, and manufacturing sectors for their reliability under extreme conditions.

Specification Summary & Compliance

This screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy and performance consistency. Threading follows UNC coarse thread standards with a Class 3A fit for precise tolerance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in regulated industries and environmental sustainability.