S-91259A852 5/8"-11 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: With 140,000 psi tensile strength and 84,000 psi minimum shear strength, this shoulder screw reliably handles high-stress applications without failure.
• Superior Wear and Corrosion Resistance: The black oxide finish on alloy steel provides enhanced durability and protection against rust in harsh industrial environments.
• Precision Thread Fit for Secure Fastening: Class 3A thread fit ensures tight, reliable connections with minimal backlash in precision assemblies.
• Easy Installation and Removal: The 3/8" hex socket drive and knurled head allow for quick, secure tool engagement and manual adjustments when needed.
• Accurate Shoulder Alignment: Tight shoulder diameter and length tolerances maintain precise component positioning in machinery and rotating assemblies.
• Long-Term Reliability: Rockwell C32 hardness guarantees consistent performance and resistance to deformation under repeated loads.
• Broad Industry Compliance: Meets ASME B18.3, RoHS 3, and REACH standards, ensuring suitability for regulated and international markets.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical alignment and high-load challenges in industrial settings. The alloy steel construction with black oxide finish combats corrosion while maintaining structural integrity under dynamic stresses. Its coarse UNC threads and Class 3A fit provide secure fastening in vibrating environments, reducing maintenance needs. The precise shoulder diameter and length ensure accurate bearing and bushing alignment, preventing misalignment in automated machinery, conveyor systems, and precision instruments. Ideal for heavy-duty applications such as robotics, automotive jigs, and packaging equipment, this screw delivers reliable performance where exact tolerances and high tensile strength are non-negotiable.

Specification Summary & Compliance

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