S-91264A624 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, this shoulder screw reliably handles high-stress applications without failure.
• Secure Vibration-Resistant Locking: Integrated nylon pellet thread locker prevents loosening under dynamic loads, maintaining clamp force in temperatures from -50° to 250°F.
• Precision Alignment & Reduced Wear: The 1/2" diameter shoulder provides accurate component positioning and acts as a bearing surface, minimizing wear on assembled parts.
• Superior Corrosion Resistance: Black oxide finish offers enhanced protection against rust and oxidation in demanding industrial environments.
• High-Strength Material Construction: Made from alloy steel with Rockwell C32 hardness, ensuring durability and resistance to deformation under heavy loads.
• Consistent Dimensional Accuracy: Manufactured to Class 3A thread fit and precise shoulder tolerances for reliable interchangeability and ease of assembly.
• Easy Installation in Confined Spaces: Socket head with hex drive allows for simple wrenching even where clearance is limited, speeding up assembly processes.

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw delivers critical engineering solutions in precision assemblies where alignment and rotational control are paramount. The alloy steel construction combined with black oxide finish provides the necessary strength and corrosion resistance for machinery, automotive, and aerospace components. The unthreaded 1/2" shoulder diameter serves as a precise pivot, bearing surface, or locator, eliminating the need for additional bushings and reducing part count. With its nylon pellet thread locker, it maintains clamp force in high-vibration environments like motors and conveyors, preventing costly downtime. The socket head design with hex drive facilitates quick installation in tight spaces, making it ideal for automated equipment and precision tooling where reliability and repeatability are essential.

Specification Summary & Compliance

This shoulder screw features 3/8"-16 UNC coarse threads with Class 3A fit for superior thread engagement, a shoulder diameter of 1/2" with tolerance of -0.004" to -0.002", and shoulder length of 1" with tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 specifications and material standard ASTM A574. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations for industrial use.