S-91259A507 8-32 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections, enhancing assembly integrity and reducing loosening over time.
• Knurled socket head design provides improved grip during installation, allowing for easier torque application and reducing tool slippage.
• Alloy steel construction with Rockwell C32 hardness offers excellent durability and wear resistance, supporting long-term operational reliability.
• Standard UNC coarse threads enable quicker assembly and disassembly, saving time in production and maintenance cycles.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations, facilitating global procurement and use.

Professional Applications & Engineering Value

This 8-32 UNC thread shoulder screw is engineered to address common industrial challenges, such as misalignment and component wear in precision assemblies. The alloy steel material, combined with a black oxide finish, provides robust resistance to corrosion and mechanical stress, making it ideal for applications in machinery, automotive systems, and electronic enclosures. The 3/16" shoulder diameter and precise Class 3A thread fit ensure accurate positioning and secure fastening, reducing the need for additional components and simplifying maintenance. By incorporating a knurled head and hex drive, it enhances installation efficiency, minimizing downtime in high-volume production environments where reliability and compliance with standards like ASME B18.3 are critical.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNC coarse threads and a shoulder diameter tolerance of -0.004" to -0.002", ensuring high dimensional accuracy. It meets ASME B18.3 manufacturing specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and regulated industries.