S-94361A394 5/8"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with 140,000 psi tensile strength and Rockwell C32 hardness, ensuring reliable performance in high-stress applications.
• Superior corrosion resistance provided by the black oxide finish, extending service life in harsh industrial environments.
• Precise alignment and secure positioning due to the 1 5/8" shoulder length with tight tolerances, minimizing component misalignment.
• High-accuracy thread engagement with Class 3A thread fit, reducing the risk of cross-threading and ensuring secure fastening.
• Easy installation and removal using a standard 3/8" hex drive and knurled head, offering improved grip and torque application.
• Fine thread design (UNF) for better adjustment and vibration resistance in precision assemblies.
• Compliance with environmental regulations including RoHS 3 and REACH, making it suitable for global industrial supply chains.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in machinery and equipment assembly. The black oxide finish not only enhances corrosion resistance but also reduces friction during installation, which is vital in automated production lines. Its Class 3A thread fit and UNF fine thread design ensure tight, reliable connections that resist loosening under vibration, commonly encountered in automotive, aerospace, and heavy machinery applications. The precisely machined shoulder provides stable alignment for rotating parts like bearings and pulleys, reducing wear and maintenance costs. By combining high tensile strength with a knurled head for easy handling, this screw streamlines assembly processes while meeting stringent industry standards for performance and safety.

Specification Summary & Compliance

This shoulder screw adheres to inch system measurements with a Class 3A thread fit for high precision in thread engagement. It features a 5/8"-18 UNF fine thread and a shoulder diameter tolerance of -0.004" to -0.002", ensuring consistent performance in assemblies. Manufactured from alloy steel, it complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element and is REACH (EC 1907/2006) compliant, confirming its suitability for regulated industrial environments.