S-91259A594 6-32 ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from the black oxide finish prolongs service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections, enhancing assembly stability and safety.
• Rockwell C32 hardness provides excellent wear resistance, maintaining dimensional integrity over repeated use cycles.
• Coarse UNC threading allows for faster installation and easier alignment, saving valuable assembly time.
• Hex socket drive design enables high-torque application with standard tools, preventing stripping and ensuring tight fastening.
• Full compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global industrial applications.

Professional Applications & Engineering Value

This alloy steel shoulder screw with 6-32 UNC coarse thread is engineered to address critical alignment and pivot point requirements in machinery, automation systems, and precision assemblies. The black oxide finish effectively resists oxidation and mild chemical exposure, making it ideal for environments where moisture or operational fluids are present. Its high tensile strength and Rockwell C32 hardness prevent deformation under load, ensuring consistent shoulder diameter and length for accurate component positioning. The socket head with hex drive allows for compact installation in confined spaces, while the Class 3A thread fit minimizes backlash in dynamic applications. These features collectively reduce assembly errors, enhance equipment longevity, and support reliable performance in industrial shoulder screw applications such as rotating shafts, linkages, and bearing supports.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precision engagement. Manufacturing follows ASTM A574 specifications, ensuring consistent material properties and dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in regulated industries and international markets.