S-91259A542 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with alloy steel construction, providing 140,000 psi tensile strength and 84,000 psi minimum shear strength for reliable performance in high-stress applications.
• Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments and reducing maintenance needs.
• Precise and secure fit with Class 3A thread fit and UNC coarse thread, ensuring easy assembly and vibration resistance in machinery and equipment.
• Easy installation and removal featuring a knurled socket head with hex drive, allowing for high-torque applications without slippage and improving workflow efficiency.
• Accurate shoulder positioning due to tight tolerances (e.g., shoulder diameter tolerance of -0.004" to -0.002"), enabling consistent alignment in pivoting or rotating mechanisms.
• High hardness and wear resistance with Rockwell C32 rating, minimizing deformation and extending the screw's lifespan under repetitive loads.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, environmental responsibility, and global acceptance for B2B procurement.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical challenges in industrial assemblies, such as misalignment and component wear. Made from alloy steel with a black oxide finish, it resists corrosion and oxidation in demanding settings like automotive, aerospace, and heavy machinery. The 10-24 UNC coarse thread and Class 3A fit provide a secure, vibration-resistant connection, reducing the risk of loosening in dynamic applications. The knurled socket head with hex drive allows for efficient torque application, speeding up maintenance and assembly processes. Ideal for use in pivots, linkages, and rotating parts, this screw ensures precise shoulder positioning with minimal play, enhancing overall system reliability and reducing downtime in industrial applications.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit and UNC coarse thread for consistent engagement. Manufacturing follows ASME B18.3 specifications, ensuring high-quality production. 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 global industrial use. Key tolerances, such as shoulder diameter (-0.004" to -0.002") and length (-0.005" to 0.005"), guarantee accuracy in assembly, supporting reliable performance in engineered systems.