S-91264A190 5/8"-11 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Strength and Durability - With a tensile strength of 140,000 psi and shear strength of 84,000 psi, this shoulder screw withstands high-stress applications, reducing the risk of fastener failure and maintenance downtime.
• Reliable Vibration Resistance - The integrated nylon pellet thread locker maintains secure fastening in temperatures from -50° to 250°F, preventing loosening in dynamic or high-vibration environments.
• Precision Thread Fit - Class 3A thread fit ensures tight tolerances and smooth assembly, minimizing play and enhancing alignment in precision machinery and equipment.
• Corrosion-Resistant Finish - Black oxide coating provides added protection against rust and wear, extending service life in harsh industrial conditions.
• Easy Installation and Removal - Hex socket drive (3/8") and knurled head design allow for quick, tool-friendly handling, speeding up assembly and disassembly processes.
• High Hardness for Longevity - Rockwell C32 hardness offers superior resistance to deformation and wear, ensuring consistent performance over repeated use cycles.
• Broad Compliance and Safety - Meets ASME B18.3, RoHS 3, and REACH standards, guaranteeing quality, environmental safety, and regulatory acceptance for global supply chains.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical challenges in industrial applications where precision, strength, and vibration resistance are paramount. The alloy steel construction, combined with a black oxide finish, provides robust corrosion protection and durability in demanding environments such as machinery assemblies, automotive systems, and heavy equipment. The nylon pellet thread locker ensures secure fastening even under extreme temperature fluctuations and dynamic loads, reducing maintenance needs and enhancing operational safety. With a Class 3A thread fit and precise shoulder dimensions, it offers reliable alignment and load distribution, making it ideal for pivots, axles, and rotating components. This socket head shoulder bolt delivers consistent performance, minimizing downtime and supporting efficient production workflows.

Specification Summary & Compliance

The screw features a 5/8"-11 UNC coarse thread with Class 3A thread fit for high precision, along with a shoulder diameter of 3/4" and length of 3/4" within tight tolerances. It is manufactured in accordance with ASME B18.3 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory adherence. The alloy steel material and black oxide finish further support durability and performance in industrial settings.