S-91259A158 6-32 ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile and shear strength with 140,000 psi tensile and 84,000 psi minimum shear, ensuring reliable performance in high-stress applications.
• Precise Class 3A thread fit for superior engagement and reduced risk of cross-threading, enhancing assembly efficiency and joint integrity.
• Durable black oxide finish provides corrosion resistance and a sleek appearance, extending service life in demanding environments.
• High-strength alloy steel construction with Rockwell C32 hardness offers excellent wear resistance and durability under repetitive loads.
• Socket head with hex drive design allows for easy installation and removal in confined spaces, improving maintenance accessibility.
• Compliance with ASTM A574, RoHS 3, and REACH standards ensures material quality and environmental safety for global industrial use.
• Coarse UNC threading and right-hand direction facilitate quick assembly and disassembly, saving time in production and repair cycles.

Professional Applications & Engineering Value

This alloy steel shoulder screw with a black oxide finish is engineered to address common industrial challenges such as vibration loosening and component misalignment. The 6-32 UNC coarse thread and Class 3A fit provide tight tolerances that prevent backlash in machinery, making it ideal for precision assemblies in automotive, aerospace, and heavy equipment. Its high tensile strength and Rockwell C32 hardness ensure it withstands dynamic loads without deformation, while the smooth socket head design enables secure fastening in hard-to-reach areas. By integrating robust materials and standardized threading, this screw reduces downtime and maintenance costs in industrial applications, delivering consistent performance where reliability is critical.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for accurate engagement and minimal play. It meets ASTM A574 specifications for high-strength alloy steel, ensuring consistent manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for international supply chains. Thread details follow UNC coarse standards with right-hand direction, and shoulder dimensions maintain tight tolerances (e.g., shoulder diameter tolerance of -0.004" to -0.002") for reliable performance in engineered systems.