S-91259A541 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capability: With a tensile strength of 140,000 PSI and shear strength of 84,000 PSI, this shoulder screw reliably handles high-stress applications without failure.
• Superior Corrosion Resistance: The black oxide finish provides enhanced protection against rust and wear, extending service life in harsh industrial environments.
• Precision Thread Fit: Class 3A thread fit ensures tight, secure fastening with minimal backlash, improving assembly accuracy and vibration resistance.
• Easy Installation and Adjustment: The hex socket drive and knurled head allow for quick, tool-friendly installation and secure grip during handling.
• High Durability and Hardness: Rockwell C32 hardness and alloy steel construction offer excellent resistance to deformation and fatigue under repetitive loads.
• Standardized Shoulder Dimensions: Precise shoulder diameter and length tolerances enable consistent alignment and smooth rotation in pivoting or guiding applications.
• Broad Regulatory Compliance: Meets ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility for global supply chains.

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 core, combined with a black oxide finish, resists corrosion and wear in demanding conditions such as automotive systems, industrial robots, and conveyor equipment. The Class 3A thread fit and coarse UNC threads provide reliable, vibration-resistant connections, reducing maintenance needs in high-cycle operations. The knurled head and hex drive facilitate easy installation in confined spaces, while the precisely machined shoulder ensures accurate component alignment, minimizing misalignment and wear in pivoting or rotational mechanisms. Ideal for applications requiring high tensile and shear strength, this screw delivers consistent performance where failure is not an option.

Specification Summary & Compliance

This shoulder screw features a 10-24 UNC coarse thread with Class 3A fit for precise engagement, and a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" to ensure dimensional accuracy. Manufactured in compliance with ASME B18.3 specifications and ASTM A574 material standards, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting safe and sustainable industrial use.