S-91259A110 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Strength & Durability: With 140,000 psi tensile strength and 84,000 psi shear strength, this screw withstands high-stress applications, reducing failure risks and maintenance needs.
• Precision Thread Fit: Class 3A thread fit ensures tight, reliable fastening with minimal backlash, ideal for assemblies requiring high positional accuracy.
• Corrosion-Resistant Finish: Black Oxide coating provides enhanced resistance to rust and wear, extending service life in harsh industrial environments.
• Secure & Easy Installation: Hex socket drive and knurled head offer superior grip and torque transmission, preventing slippage during assembly.
• Robust Material Hardness: Rockwell C32 hardness maintains structural integrity under load, ensuring long-term performance without deformation.
• Standardized Shoulder Design: Precise shoulder diameter and length (1/4" and 3-1/2") with tight tolerances facilitate accurate alignment in pivoting or rotating mechanisms.
• Industry Compliance: Meets ASME B18.3, ASTM A574, RoHS 3, and REACH standards, guaranteeing quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This Alloy Steel Shoulder Screw with a 10-24 UNC coarse thread and Black Oxide finish is engineered to address critical challenges in precision machinery, such as misalignment and component wear. The socket head design and hex drive enable efficient installation in confined spaces, while the knurled texture enhances handling. Commonly used in robotics, automotive assemblies, and conveyor systems, the screw’s shoulder diameter acts as a pivot point, reducing friction and ensuring smooth rotational movement. Its high tensile and shear strength mitigates fatigue in dynamic loads, making it a reliable choice for industrial applications demanding durability and exact tolerances.

Specification Summary & Compliance

The screw features a Class 3A thread fit per UNC standards, with shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for precise assembly. Manufactured in compliance with ASME B18.3 and ASTM A574 specifications, it adheres to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.