S-91259A448 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 demanding applications.
• Superior corrosion resistance and reduced light reflection thanks to the black oxide finish, extending service life in harsh environments.
• Precise alignment and secure positioning enabled by the knurled head and standard shoulder fit, minimizing assembly errors.
• High thread reliability with Class 3A fit and coarse UNC threading, ensuring consistent fastening and vibration resistance.
• Optimized torque transmission via the 3/8" hex drive and socket head design, facilitating easy installation with standard tools.
• Enhanced durability from Rockwell C32 hardness and alloy steel construction, reducing wear and maintenance needs.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and regulatory adherence.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical challenges in heavy-duty industrial applications, such as machinery assembly, automotive systems, and precision equipment. The alloy steel material and black oxide finish provide excellent strength and corrosion resistance, preventing failures in high-stress environments. Its UNC coarse thread and Class 3A fit ensure secure, vibration-resistant connections, while the knurled head and standard shoulder allow for accurate component alignment, reducing misalignment issues. Ideal for uses requiring high tensile and shear strength, this screw enhances reliability in pivots, axles, and rotating mechanisms, delivering long-term performance with minimal upkeep.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a thread size of 5/8"-11 UNC with Class 3A thread fit for tight tolerances, and shoulder diameter and length tolerances of -0.004" to -0.002" and -0.005" to 0.005", respectively. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory conformity for industrial use.