S-92949A871 3/8"-16 x 4 1/2" 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 passivated finish, ideal for harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precise, secure fastening ensured by Class 3A thread fit and UNC coarse threading, minimizing loosening under vibration
• Easy installation and removal with hex drive (7/32") and rounded button head design, reducing assembly time
• Full-length threading provides consistent grip and distribution of stress along the entire 4 1/2" length
• Compliance with industry standards including ASME B18.3, ensuring consistent quality and interchangeability
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw is engineered to address critical challenges in industrial and mechanical assemblies. Its passivated finish significantly enhances corrosion resistance, making it suitable for applications exposed to moisture, chemicals, or outdoor conditions. The 3/8"-16 UNC coarse thread and Class 3A thread fit deliver high precision and vibration resistance, reducing the risk of fastener failure in dynamic environments like machinery, automotive systems, and structural frameworks. The hex drive and button head style allow for efficient torque application in confined spaces, streamlining maintenance and assembly processes while maintaining a low-profile appearance. Ideal for heavy-duty fastening where reliability and durability are paramount, this screw supports long-term performance in demanding sectors such as manufacturing, construction, and transportation.

Specification Summary & Compliance

This screw adheres to strict dimensional and performance criteria, including Class 3A thread fit for precise engagement and UNC coarse threading (3/8"-16) per standard inch system measurements. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability. The product is fully threaded, with a length of 4 1/2", and is designed for consistent performance in industrial applications requiring high tensile strength and corrosion resistance.