S-91259A115 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance under heavy loads and reduces the risk of fastener failure in demanding applications.
• High minimum shear strength of 84,000 psi provides superior resistance to lateral forces, enhancing joint integrity and component longevity.
• Precision Class 3A thread fit guarantees consistent, secure mating with nuts and tapped holes, minimizing assembly issues and improving production efficiency.
• Durable black oxide finish on alloy steel offers excellent corrosion resistance, extending service life in harsh industrial environments.
• Knurled socket head with hex drive allows for easy installation and high-torque application, reducing tool slippage and speeding up assembly processes.
• 4" shoulder length with standard fit provides precise alignment and spacing for rotating components like gears and pulleys, reducing wear and maintenance needs.
• Rockwell C32 hardness ensures the screw maintains its shape and thread integrity under stress, offering long-term reliability.

Professional Applications & Engineering Value

This 10-24 UNC shoulder screw is engineered to address critical challenges in precision machinery and heavy-duty assemblies. The alloy steel construction, combined with a black oxide finish, resists corrosion and wear, making it ideal for automotive, aerospace, and industrial equipment where environmental factors can compromise fastener integrity. The coarse UNC thread and Class 3A fit ensure quick, secure fastening, reducing assembly time and preventing loosening under vibration. With a 4" shoulder length, it excels in applications requiring exact axial positioning, such as in conveyor systems or robotic arms, minimizing misalignment and enhancing operational efficiency. The knurled socket head provides a non-slip grip for high-torque installations, supporting maintenance-free performance in continuous-use scenarios.

Specification Summary & Compliance

This shoulder screw features a 10-24 UNC thread with Class 3A fit for precise tolerance, and a shoulder diameter of 1/4" with tight tolerances (e.g., -0.004" to -0.002") to ensure accurate component alignment. It meets ASME B18.3 and ASTM A574 specifications for dimensional consistency and material quality, and is compliant with RoHS 3 and REACH regulations, ensuring environmental safety and suitability for global industrial markets.