S-92012A522 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with 140,000 psi tensile strength and Rockwell C32 hardness for reliable performance in demanding applications.
• Superior corrosion resistance provided by the black oxide finish, extending the screw's service life in various industrial environments.
• Precise alignment and smooth rotation ensured by the precisely machined shoulder with a diameter tolerance of -0.001" to 0" for minimal play.
• Secure and efficient installation using the standard hex socket head and 5/64" drive, allowing for high torque application without slippage.
• Wide compatibility and easy assembly with the 4-40 UNC coarse right-hand thread and Class 2A fit, facilitating quick integration into standard components.
• Consistent dimensional accuracy with controlled shoulder length (1/2") and thread length (5/32") for repeatable performance in automated or manual assembly.
• Environmental and regulatory compliance meeting RoHS 3 and REACH standards, ensuring safe use in global markets.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered from alloy steel to address critical needs in precision machinery, such as providing a durable pivot point in linkages, ensuring accurate spacing in assemblies, and supporting rotating components in electromechanical devices. The black oxide finish enhances corrosion resistance, making it suitable for environments exposed to moisture or chemicals, while the precise shoulder fit minimizes backlash and wear in high-cycle applications. Its coarse thread and right-hand direction enable rapid installation in industrial equipment, reducing assembly time and maintenance costs. By combining high tensile strength with reliable thread engagement, this screw solves common issues like part misalignment and premature failure, delivering long-term engineering value in automotive, aerospace, and manufacturing sectors.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement, and features precise shoulder diameter tolerance (-0.001" to 0") and length tolerance (0" to 0.002") to ensure dimensional accuracy. Manufactured from alloy steel under strict controls, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in restricted substance-sensitive applications.