S-92949A535 1/4"-20 x 3/8" ASME B18.3 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 industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, heavy-duty fastening
• Precise, secure installation enabled by the 5/32" hex drive, preventing cam-out and ensuring consistent torque application
• Optimized thread engagement with Class 3A UNC coarse threads providing excellent vibration resistance and quick assembly
• Versatile rounded button head design offering a low-profile, finished appearance while reducing stress concentration
• Full thread coverage along the 3/8" length for maximum grip and load distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw delivers critical performance in demanding applications where corrosion resistance and mechanical reliability are paramount. The passivated finish significantly enhances surface durability against chemicals and moisture, while the UNC coarse thread (1/4"-20) ensures rapid installation and superior vibration resistance in machinery, automotive assemblies, and structural frameworks. The hex drive design allows for high-torque application without slippage, making it ideal for confined spaces in industrial equipment, electronic enclosures, and manufacturing fixtures. Engineered to prevent thread stripping and maintain clamping force under dynamic loads, this fully threaded screw provides uniform stress distribution, reducing the risk of joint failure in critical fastening systems.

Specification Summary & Compliance

This fastener features precise Class 3A thread fit for tight tolerances and secure mating, manufactured in accordance with ASME B18.3 specifications. The 1/4"-20 UNC coarse thread and 3/8" length ensure dimensional consistency, while compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and material suitability for international industrial markets.