S-94361A371 1/2"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 PSI for reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black oxide finish, extending service life and maintaining integrity in harsh environments.
• Precision Class 3A thread fit ensures tight, secure connections with minimal backlash, ideal for assemblies requiring high accuracy.
• Rockwell C32 hardness provides excellent wear resistance, ensuring durability and long-term reliability under repetitive loads.
• Knurled socket head with 5/16" hex drive offers enhanced grip and easy installation, reducing tool slippage and assembly time.
• Fine UNF threads deliver better clamping force and vibration resistance compared to coarse threads, suitable for precision machinery.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and meets global standards for industrial components.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in industrial applications where precision and strength are paramount. The black oxide finish not only enhances corrosion resistance but also reduces friction during installation, preventing galling in high-torque scenarios. With a shoulder diameter of 5/8" and length of 7/8", it provides stable alignment for rotating parts like bearings and pulleys, minimizing misalignment and wear. The Class 3A UNF fine threads ensure secure fastening in high-vibration environments, such as automotive assemblies or heavy machinery, while the 140,000 PSI tensile strength supports heavy loads without deformation. Ideal for precision shoulder screws in robotics and aerospace, this component delivers consistent performance under demanding conditions.

Specification Summary & Compliance

This shoulder screw features 1/2"-20 UNF Class 3A threads with fine spacing for precise fit, and a shoulder diameter tolerance of -0.004" to -0.002" for accurate alignment. Manufactured to high standards, it includes a Rockwell C32 hardness and meets RoHS 3 (2015/863/EU) compliance with exemption 6(a), as well as REACH (EC 1907/2006) adherence, ensuring it is free from hazardous substances for safe industrial use.