S-91259A449 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 demanding industrial applications
• Superior corrosion resistance provided by the black oxide finish, extending service life in harsh environments
• Precision Class 3A thread fit ensures secure fastening with minimal backlash in critical assemblies
• Knurled socket head design delivers enhanced grip and torque transmission during installation
• Rugged alloy steel construction with Rockwell C32 hardness maintains dimensional stability under heavy loads
• Coarse UNC threading enables rapid assembly and disassembly while resisting vibration-induced loosening
• Strict dimensional control with shoulder diameter tolerance of -0.004" to -0.002" for precise component alignment

Professional Applications & Engineering Value

Engineered for precision machinery and heavy-duty equipment, these alloy steel shoulder screws serve as both fasteners and precision axles in rotating assemblies. The black oxide finish provides essential corrosion protection while maintaining dimensional accuracy in industrial environments. With their 3/4" shoulder diameter and 1 3/8" shoulder length, these components excel in applications requiring exact pivot points or bearing surfaces. The 5/8"-11 UNC coarse threads with Class 3A fit ensure vibration-resistant connections in high-stress assemblies, while the knurled socket head facilitates secure tool engagement during torque-critical installations. These shoulder screws effectively eliminate the need for separate spacers and provide reliable alignment in automated systems, reducing assembly time and improving mechanical reliability.

Specification Summary & Compliance

This shoulder screw features precision Class 3A thread fit with 5/8"-11 UNC coarse threads and maintains tight shoulder diameter tolerance of -0.004" to -0.002". Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, the fastener delivers consistent performance across industrial applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global manufacturing requirements while meeting rigorous mechanical property standards.