S-91264A805 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 for reliable performance in demanding applications.
• Secure vibration-resistant locking thanks to the integrated nylon pellet thread locker, maintaining fastener integrity from -50° to 250°F.
• Precise alignment and smooth rotation enabled by the standard shoulder fit and knurled head texture, reducing wear on mating components.
• Superior corrosion resistance and reduced galling from the black oxide finish, extending service life in harsh industrial environments.
• High-strength alloy steel construction with Rockwell C32 hardness ensures durability and resistance to deformation under heavy loads.
• Accurate and reliable threading with Class 3A thread fit and 5/8"-11 UNC coarse threads for easy assembly and consistent engagement.
• Convenient installation and removal using a standard 3/8" hex drive, compatible with common tools for efficient maintenance.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical challenges in industrial applications where precise component alignment, high shear loads, and vibration resistance are paramount. The alloy steel construction and black oxide finish provide excellent strength and corrosion protection, making it ideal for machinery, automotive assemblies, and heavy equipment. The UNC coarse threads and Class 3A thread fit ensure quick, secure fastening, while the integrated nylon pellet thread locker prevents loosening under dynamic conditions. The shoulder diameter and length offer stable bearing surfaces, reducing wear and simplifying assembly in pivoting or rotating mechanisms, ultimately enhancing operational reliability and reducing maintenance downtime.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter of 3/4" with tolerance of -0.004" to -0.002" and shoulder length of 1" with tolerance of -0.005" to 0.005". Thread specifications include 5/8"-11 UNC coarse threads with Class 3A thread fit for high accuracy. It complies with ASME B18.3 standards and is manufactured to ASTM A574 specifications. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental and safety adherence for global industrial use.