S-91259A104 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength, ensuring reliable performance in high-stress applications.
• Superior corrosion resistance from the black oxide finish, extending service life in demanding industrial environments.
• Precise assembly and alignment guaranteed by the Class 3A thread fit and standard shoulder fit, minimizing play and vibration.
• Enhanced durability and wear resistance due to the alloy steel construction and Rockwell C32 hardness, suitable for repetitive use.
• Secure and easy installation with the hex socket drive and knurled head, providing a firm grip and reducing tool slippage.
• Broad compatibility with UNC coarse threading, facilitating quick assembly and disassembly in various machinery and equipment.
• Regulatory compliance and reliability meeting ASME B18.3, ASTM A574, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in industrial settings, such as misalignment and component wear. Its UNC coarse thread and Class 3A fit provide tight tolerances that prevent loosening under vibration, making it ideal for precision machinery, automotive assemblies, and robotics. The black oxide finish enhances corrosion resistance, reducing maintenance needs in humid or corrosive environments. With a 2 1/4" shoulder length and 1/4" shoulder diameter, it ensures accurate spacing and rotational control in linkages and bearings, while the hex socket drive allows for efficient installation in confined spaces. This screw delivers reliable performance, minimizing downtime and improving operational efficiency in demanding applications.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC coarse threading. The shoulder diameter tolerance ranges from -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring consistent performance. It complies with ASME B18.3 and ASTM A574 manufacturing specifications, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substances.