S-92949A111 4-40 x 7/16" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments.
• High tensile strength of 70,000 psi ensures reliable, long-lasting fastening under demanding mechanical loads.
• Precise Class 3A thread fit guarantees secure engagement and reduces the risk of cross-threading during assembly.
• Coarse UNC threading provides faster installation and better performance in materials prone to stripping.
• Hex drive (1/16") design allows for high-torque application with standard tools, minimizing slippage and tool wear.
• Rounded button head profile offers a low-profile, aesthetically pleasing finish while reducing snagging risks.
• Full compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to strict quality, safety, and environmental standards.

Professional Applications & Engineering Value

Engineered for precision and durability, these 4-40 UNC thread rounded head screws are crafted from 18-8 stainless steel with a passivated finish to combat oxidation and chemical exposure in demanding settings. The coarse thread and Class 3A fit enhance grip in soft metals or plastics, preventing loosening under vibration. With a Rockwell B55 hardness and 70,000 psi tensile strength, they withstand high-stress applications in machinery, electronics, and automotive assemblies. The hex drive ensures efficient installation, making them ideal for industrial fastening where reliability and regulatory compliance are critical.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances per ASME B18.3 standards. It is fully threaded for consistent holding power and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substances.