S-94361A386 5/8"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With 140,000 psi tensile strength, this shoulder screw provides reliable load-bearing capacity for demanding mechanical assemblies.
• Precision Thread Fit – Class 3A thread fit ensures tight tolerances and secure fastening in high-vibration environments, reducing the risk of loosening.
• Corrosion-Resistant Protection – Black oxide finish offers enhanced resistance to rust and wear, extending service life in industrial conditions.
• Superior Material Hardness – Alloy steel with Rockwell C32 hardness maintains structural integrity under repeated stress and mechanical loads.
• Secure Drive & Handling – 3/8" hex drive and knurled head design allow for easy installation and torque application without slippage.
• Fine Thread Engagement – 5/8"-18 UNF fine threads deliver improved clamping force and finer adjustment in precision applications.
• Regulatory Compliance – Meets RoHS 3 and REACH standards, ensuring safety and environmental responsibility in global supply chains.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical alignment and load distribution challenges in industrial machinery, automation systems, and precision equipment. The Class 3A thread fit and UNF fine threading provide exceptional accuracy for assemblies requiring minimal backlash, such as in robotics, conveyor systems, and motor mounts. The black oxide finish not only resists corrosion but also reduces galling during installation, which is vital in high-cycle manufacturing environments. Combined with a knurled head and hex drive, this screw ensures secure handling and consistent performance, making it ideal for applications where vibration resistance and long-term reliability are non-negotiable.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit standards with precise shoulder diameter and length tolerances (e.g., shoulder diameter: -0.004" to -0.002"). Manufactured from alloy steel with a black oxide finish, it complies with RoHS 3 (2015/863/EU) under exemption 6(a) and REACH (EC 1907/2006), ensuring it meets international regulatory requirements for industrial use.