S-97763A103 4-40 x 3/8" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide 18-8 Stainless Steel, ideal for harsh industrial environments
• High tensile strength of 70,000 psi ensures reliable load-bearing capacity and joint integrity
• Precise Class 3A thread fit for secure fastening and reduced risk of cross-threading
• Fully threaded design provides maximum grip and uniform stress distribution along the entire length
• 1/16" hex drive allows for easy installation with standard tools and prevents stripping
• Rockwell B55 hardness offers excellent durability and resistance to wear and deformation
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards

Professional Applications & Engineering Value

These 4-40 UNC thread rounded head screws are engineered to address critical industrial challenges, such as vibration loosening and corrosion in demanding applications. The Black-Oxide 18-8 Stainless Steel material provides enhanced protection against rust and chemical exposure, making them ideal for machinery, electronics, and outdoor equipment. With a coarse thread spacing and Class 3A thread fit, they ensure quick assembly and reliable performance in high-stress environments. The fully threaded and button head style offers a low-profile, secure fastening solution that minimizes protrusion and improves safety in compact designs.

Specification Summary & Compliance

This product adheres to Class 3A thread fit for precise dimensional accuracy, with UNC thread type and coarse thread spacing per standard specifications. It meets ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability for industrial use.