S-91264A630 3/8"-16 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.
• Secure vibration-resistant locking thanks to the integrated nylon pellet thread locker, maintaining integrity across a wide temperature range from -50° to 250°F.
• Precise alignment and smooth rotation enabled by the knurled head and standard shoulder fit, reducing wear in machinery and pivoting assemblies.
• Superior corrosion resistance and reduced galling from the black oxide finish, extending service life in harsh industrial environments.
• High-strength durability with Rockwell C32 hardness alloy steel construction, ensuring long-term reliability under repetitive stress.
• Accurate and consistent fastening with Class 3A thread fit and UNC coarse threading for easy assembly and high clamp load retention.
• Easy installation and removal using a standard 1/4" hex drive socket, saving time and reducing tooling requirements.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision assembly and heavy-duty machinery. The 1 3/4" shoulder length provides a precise bearing surface for rotating components, minimizing misalignment and wear in applications like conveyor systems, robotic arms, and pivoting mechanisms. The black oxide finish not only enhances corrosion resistance but also reduces friction, crucial for maintaining operational efficiency. Integrated nylon pellet thread locking ensures the fastener remains securely in place despite vibrations and thermal cycling, preventing costly downtime. With its high tensile and shear strength, this shoulder screw is ideal for industrial automation, automotive jigs, and material handling equipment, where reliability and precision are paramount.

Specification Summary & Compliance

This shoulder screw features a 3/8"-16 UNC coarse thread with Class 3A fit for precise tolerance, and a shoulder diameter tolerance of -0.004" to -0.002" for consistent alignment. It is manufactured in compliance with ASME B18.3 and ASTM A574 specifications, ensuring dimensional accuracy and mechanical properties. The product is also RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety standards for global industrial use.