S-92949A641 3/8"-16 x 4" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, heavy-duty fastening.
• Precise, secure thread engagement with Class 3A thread fit and UNC coarse threads, reducing the risk of cross-threading and ensuring consistent performance.
• Efficient installation and high torque capability via the 7/32" hex drive, minimizing tool slippage and speeding up assembly processes.
• Full-length threading for maximum grip and load distribution along the entire 4-inch length, enhancing joint integrity.
• Compliance with rigorous standards including ASME B18.3, RoHS, and REACH, ensuring product quality, safety, and environmental responsibility.
• Rounded button head design provides a low-profile, finished appearance while reducing the risk of snagging and operator injury.

Professional Applications & Engineering Value

This 3/8"-16 UNC fully threaded screw is engineered to address critical challenges in industrial assembly, where corrosion resistance and high tensile strength are paramount. The 18-8 stainless steel material combined with a passivated finish significantly extends service life in moist or chemically aggressive environments, preventing fastener failure. Its Class 3A thread fit and coarse thread spacing ensure rapid, reliable installation with reduced risk of stripping, making it ideal for heavy machinery, structural frameworks, and automotive applications. The rounded head with hex drive allows for tight spaces and high-torque applications, streamlining maintenance and assembly workflows while maintaining a secure, flush fit.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including UNC thread form, Class 3A thread fit for superior tolerance, and a 4-inch length with full threading. It is manufactured in compliance with ASME B18.3 specifications, ensuring consistent quality and performance. Additionally, the product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.