S-90325A154 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Precise component alignment ensured by the exact 1/8" shoulder diameter and 1/2" shoulder length with tight tolerances.
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications.
• Reliable fastening and easy installation via the socket head with 5/64" hex drive and standard UNC coarse threads.
• Consistent thread engagement guaranteed by the Class 2A thread fit for smooth assembly and reduced risk of cross-threading.
• Environmental and regulatory compliance meeting RoHS 3 and REACH standards for safe, sustainable use.
• Durable, long-lasting operation due to the robust material and precise shoulder fit, minimizing wear and maintenance needs.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in industrial applications. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to corrosion and oxidation, making it suitable for machinery, automotive assemblies, and electronic enclosures exposed to moisture or chemicals. The precise shoulder diameter and length with minimal tolerances ensure accurate positioning of components like gears, pulleys, and linkages, reducing vibration and misalignment issues. The socket head with hex drive allows for easy installation in confined spaces, while the coarse UNC threads and Class 2A fit facilitate quick, secure fastening without stripping. This screw’s high tensile strength and hardness support heavy-duty use, enhancing equipment reliability and reducing downtime in production environments.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. The shoulder features a diameter of 1/8" (tolerance: -0.001" to 0") and length of 1/2" (tolerance: 0" to 0.002"), ensuring precise assembly. It is manufactured from 18-8 stainless steel with a passivated finish, and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its suitability for global industrial and electronic applications.