S-97345A216 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments including marine and chemical processing.
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under heavy loads.
• Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash in high-vibration applications.
• Knurled socket head with 5/64" hex drive provides enhanced grip and prevents tool slippage during installation.
• Accurate shoulder dimensions with tight tolerances (e.g., shoulder diameter: -0.004" to -0.002") for consistent alignment in assemblies.
• Compliance with RoHS 3 and REACH standards, ensuring environmental safety and regulatory acceptance in global markets.
• Coarse UNC thread design facilitates quick assembly and disassembly, reducing maintenance time.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw in 316 Stainless Steel is engineered to address critical challenges in precision machinery, such as misalignment and corrosion-induced failure. The socket head design with knurled texture and 5/64" hex drive ensures secure tool engagement, minimizing wear in automated assembly lines. Its Class 3A thread fit and 1-3/8" shoulder length with tight tolerances provide stable rotational support in applications like pivots, gears, and electronic enclosures, reducing downtime. The material's inherent resistance to chlorides and acids makes it suitable for industrial applications in marine, pharmaceutical, and food processing equipment, where durability and compliance with RoHS and REACH are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precision, featuring a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Manufactured to deliver consistent performance with a hardness of Rockwell B79, it is ideal for applications requiring reliable mechanical properties and regulatory conformity.