S-92949A107 4-40 x 5/16" 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, ensuring long-term reliability in harsh environments.
• High tensile strength of 70,000 psi provides dependable holding power for demanding industrial applications.
• Precise Class 3A thread fit ensures smooth assembly and secure fastening, reducing the risk of cross-threading.
• Hex drive (1/16") design allows for easy installation and high torque application with standard tools.
• Fully threaded right-hand coarse (UNC) design offers maximum grip and faster installation in a variety of materials.
• Rockwell B55 hardness enhances durability and resistance to wear, extending the screw's service life.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to strict industry and environmental standards.

Professional Applications & Engineering Value

These 4-40 UNC thread rounded head screws are engineered to address common industrial fastening challenges, such as vibration loosening and corrosion-induced failure. The 18-8 Stainless Steel material, combined with a passivated finish, provides exceptional resistance to rust and chemical exposure, making them ideal for use in machinery, electronics, and outdoor equipment. The coarse thread spacing and Class 3A fit ensure reliable performance in soft materials or where rapid assembly is critical. With a hex drive for secure tool engagement, these fully threaded screws deliver consistent clamping force, reducing maintenance needs and downtime in industrial applications.

Specification Summary & Compliance

This product features a 4-40 UNC thread with Class 3A fit for precise dimensional accuracy. It meets ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard performance.