S-97381A104 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• High tensile strength of 40,000 psi ensures reliable load-bearing capacity in demanding applications, reducing the risk of fastener failure.
• Lightweight 6061 aluminum construction provides excellent corrosion resistance and reduces overall assembly weight without sacrificing durability.
• Precision Class 3A thread fit guarantees smooth assembly and secure fastening, minimizing play and vibration loosening.
• Knurled socket head with 5/64" hex drive offers superior grip and torque transmission during installation, preventing tool slippage.
• Coarse UNC threading enables quick installation and removal, saving time in high-volume production environments.
• RoHS 3 and REACH compliance ensures environmental and safety standards are met, making it suitable for regulated industries.
• Consistent shoulder dimensions with tight tolerances provide accurate alignment and spacing in assemblies, enhancing mechanical stability.

Professional Applications & Engineering Value

This 6061 aluminum shoulder screw is engineered to address common industrial challenges such as component misalignment and weight reduction in precision machinery. The 4-40 UNC coarse thread and Class 3A fit ensure rapid, secure fastening in applications like robotics, aerospace assemblies, and electronic enclosures, where vibration resistance and repeatability are critical. The knurled socket head with a hex drive allows for high-torque installation without stripping, while the aluminum material offers inherent corrosion resistance, extending service life in harsh environments. Ideal for use in industrial shoulder screw setups, it provides reliable performance in pivots, spacers, and rotating mechanisms, reducing maintenance needs and improving operational efficiency.

Specification Summary & Compliance

This shoulder screw features a 1/8" shoulder diameter with a tolerance of -0.004" to -0.002" and a 5/16" shoulder length with a tolerance of -0.005" to 0.005", ensuring precise dimensional accuracy. It adheres to UNC thread standards with a Class 3A fit for superior thread engagement. The product is manufactured in compliance with RoHS 3 (2015/863/EU) under exemption 6(b)-II and REACH (EC 1907/2006), confirming its suitability for environmentally conscious and regulated industrial applications.