S-91259A235 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 shear strength for reliable performance in high-stress applications
• Superior corrosion resistance thanks to the black oxide finish, extending service life in demanding industrial environments
• Precision shoulder alignment with 8" length and tight tolerances (±0.005") ensuring accurate component positioning and reduced assembly time
• Enhanced durability through Rockwell C32 hardness and alloy steel construction, resisting wear and deformation under heavy loads
• Secure installation and removal with 3/8" hex socket drive and knurled head texture for superior grip and torque application
• Reliable thread engagement with Class 3A UNC coarse threads providing strong, vibration-resistant connections
• Full regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for quality assurance and environmental safety

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw delivers critical engineering value in applications requiring precise rotational alignment and heavy load support. The alloy steel construction with black oxide finish provides excellent corrosion resistance for machinery, automotive, and industrial equipment where environmental factors challenge fastener integrity. The 8" precision shoulder serves as an accurate locating surface for rotating components, eliminating the need for additional bushings or spacers. With Class 3A thread fit and coarse UNC threads, installation is simplified while maintaining vibration resistance in high-torque applications. The socket head design with 3/8" hex drive allows for compact installation in confined spaces, making it ideal for precision assemblies where access is limited but high clamping force is required.

Specification Summary & Compliance

This shoulder screw maintains precision dimensional accuracy with Class 3A thread fit for superior engagement and shoulder diameter tolerance of -0.004" to -0.002". The 8" shoulder length features tight tolerance control (-0.005" to +0.005") ensuring consistent positioning in assembly applications. Manufactured to ASME B18.3 specifications and compliant with ASTM A574 material standards, this fastener meets rigorous industrial requirements. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental responsibility and regulatory adherence for global industrial applications.