S-91264A247 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced vibration resistance with permanent nylon pellet thread locking, maintaining secure fastening from -50° to 250° F in dynamic environments.
• Superior load-bearing capacity due to alloy steel construction, offering 140,000 psi tensile strength and 84,000 psi shear strength for heavy-duty applications.
• Precise alignment and spacing enabled by the 1" shoulder length with tight tolerances, reducing assembly errors and improving component fit.
• Reliable thread engagement with UNC 10-24 coarse threads and Class 3A fit, ensuring consistent performance and easy installation in various materials.
• Durable corrosion protection from the black oxide finish, extending service life in harsh industrial conditions.
• Secure and efficient driving with a knurled socket head and 1/8" hex drive, providing excellent grip and torque application without slippage.
• Compliance with industry standards including ASME B18.3 and ASTM A574, guaranteeing quality and safety for professional use.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy equipment. The UNC 10-24 thread with Class 3A fit ensures reliable fastening in assemblies requiring repeated adjustments, while the 1" shoulder length with minimal tolerances provides exact positioning for rotating parts like bearings and pulleys, reducing wear and misalignment. The permanent nylon locking pellet secures the screw against loosening under vibration, common in motors and conveyors, and the black oxide finish resists corrosion, making it ideal for industrial environments. By integrating high tensile and shear strength, this screw supports demanding applications in aerospace, automotive, and manufacturing, where failure prevention is paramount.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter of 1/4" with tolerance of -0.004" to -0.002" and shoulder length of 1" with tolerance of -0.005" to 0.005", ensuring standard fit for consistent performance. The UNC 10-24 thread adheres to Class 3A precision standards, and manufacturing complies with ASME B18.3 and ASTM A574 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and suitability for global industrial and commercial use.