S-97654A342 4-40 x 3/8" Stainless Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments
• Superior torque transmission via 1/16" hex drive, ensuring secure installation and reduced tool slippage
• High tensile strength of 70,000 psi provides reliable load-bearing capacity for demanding applications
• Precise Class 3A thread fit ensures smooth engagement and vibration resistance in assemblies
• Wide button head design with integrated flange distributes clamping force evenly, preventing surface damage
• Full threading along the 3/8" length allows for maximum adjustability and holding power
• Compliance with RoHS 3 and REACH regulations guarantees environmental safety and global market acceptance

Professional Applications & Engineering Value

Engineered for precision assemblies, this 4-40 UNC threaded screw combines 18-8 stainless steel with a passivated finish to resist oxidation and chemical exposure in electronics, machinery, and automotive components. The flanged rounded head eliminates the need for separate washers, reducing part count and assembly time while providing a clean, finished appearance. With a coarse thread and Class 3A fit, it ensures rapid installation and secure fastening in materials where vibration loosening is a concern. The hex drive design offers high torque capability, making it suitable for automated or manual driving systems in high-volume production environments.

Specification Summary & Compliance

This screw adheres to UNC thread standards with a Class 3A thread fit for precise dimensional accuracy. It features a right-hand thread direction, fully threaded 3/8" length, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for restricted substance control. Manufactured to maintain Rockwell B70 hardness and 70,000 psi tensile strength, it ensures consistent performance under mechanical stress.