S-91259A424 10-24 ASME B18.3, ASTM A108 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Strength and Durability: Crafted from alloy steel with a Rockwell C32 hardness and 140,000 psi tensile strength, this screw withstands high-stress applications, reducing the risk of failure and extending service life.
• Superior Corrosion Resistance: The black oxide finish provides a protective layer that minimizes rust and wear, ensuring reliable performance in harsh industrial environments.
• Precision Fit for Stable Assembly: Featuring a Class 3A thread fit and tight shoulder diameter tolerance, it offers a secure, vibration-resistant connection that maintains alignment in machinery and equipment.
• Easy Installation and Removal: The hex drive (1/8") and socket head design, combined with a knurled head texture, allow for a firm grip and efficient torque application, speeding up assembly and maintenance tasks.
• Versatile Shoulder Design: With a 4 1/2" shoulder length and precise tolerances, it acts as an accurate pivot or spacer, reducing part wear and simplifying mechanical designs.
• Reliable Thread Performance: The 10-24 UNC coarse thread and right-hand direction ensure quick engagement and strong holding power, ideal for dynamic loads and frequent adjustments.
• Compliance with Industry Standards: Meets ASME B18.3 specifications and is RoHS 3 and REACH compliant, guaranteeing safety, environmental responsibility, and interoperability in global supply chains.

Professional Applications & Engineering Value

This shoulder screw is engineered to address common challenges in precision machinery, such as misalignment and component wear. The alloy steel construction and black oxide finish provide excellent resistance to corrosion and high tensile stresses, making it ideal for applications in automotive assemblies, industrial robots, and conveyor systems. The UNC coarse thread and Class 3A fit ensure quick, secure fastening that withstands vibrations, while the knurled socket head allows for easy access in tight spaces. By offering a durable shoulder that serves as a reliable bearing surface, it reduces the need for additional bushings, streamlining design and lowering maintenance costs in high-performance environments.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industries worldwide.