S-97768A479 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and Black Oxide finish, ideal for harsh industrial environments
• Precise alignment and reduced assembly time thanks to the 5/8" shoulder diameter with tight tolerance control
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Secure, non-slip installation enabled by the knurled head and standard hex socket drive
• Reliable thread engagement through Class 3A UNC coarse threads, ensuring consistent fastening performance
• Durability under stress with Rockwell B55 hardness, maintaining integrity in high-vibration settings
• Compliance with industry standards including ASME B18.3, RoHS, and REACH for quality assurance and environmental safety

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and rotational stability challenges in machinery assembly. The 18-8 Stainless Steel material, combined with a Black Oxide finish, provides excellent resistance to corrosion and wear, making it suitable for automotive, aerospace, and heavy equipment applications. The 5/8" shoulder diameter acts as a precise pivot or spacer, reducing component misalignment and minimizing wear on moving parts. With a coarse UNC thread and Class 3A fit, it ensures quick installation and secure holding power in high-stress environments, while the knurled head enhances grip during torque application. Ideal for use in conveyor systems, robotic arms, and precision instruments, this screw delivers long-term reliability and reduces maintenance downtime.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC thread with Class 3A precision tolerance for consistent fit. The shoulder diameter is manufactured to a tight tolerance of -0.004" to -0.002", and the shoulder length is controlled within -0.005" to 0.005" for accurate assembly. It complies with ASME B18.3 specifications for dimensional standards, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for industrial use.