S-90910A724 4-40 x 3/4" ASME B18.3 Stainless Steel Button Head Torx Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• Enhanced torque transmission and strip resistance thanks to the T8 Torx drive, reducing tool slippage and assembly errors.
• High tensile strength of 60,000 psi and Rockwell B55 hardness for dependable load-bearing performance in demanding applications.
• Precise Class 3A thread fit with UNC coarse threading, enabling faster installation and secure fastening in various materials.
• Fully threaded 3/4" length provides maximum grip and adjustment flexibility along the entire shank.
• Rounded button head design offers a low-profile, finished appearance while minimizing snagging risks.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to strict industrial and environmental standards.

Professional Applications & Engineering Value

These 4-40 UNC T8 Torx rounded head screws are engineered to address critical assembly challenges in precision industries. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to oxidation and chemical exposure, making them ideal for electronics, medical devices, and outdoor equipment where corrosion resistance is paramount. The T8 Torx drive ensures high torque transfer without cam-out, reducing fastener damage and improving production line efficiency. With a Class 3A thread fit and coarse UNC threading, these screws facilitate quick, reliable installations in metals and plastics, minimizing cross-threading risks. Their fully threaded design and rounded head profile further enhance versatility and safety in compact assemblies, delivering consistent performance in automated or manual industrial fastening applications.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances and reliable engagement. Manufacturing adheres to ASME B18.3 specifications for dimensional accuracy and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting environmentally responsible sourcing.