S-97381A106 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• High strength-to-weight ratio from 6061 aluminum construction, ideal for applications where weight reduction is critical without sacrificing structural integrity.
• Precise component location and smooth rotation ensured by the 1/2" shoulder with tight diameter tolerance, minimizing play and wear in assemblies.
• Secure and reliable fastening provided by the Class 3A UNC coarse thread, offering excellent resistance to loosening under vibration.
• Enhanced grip for manual installation and adjustment with the knurled socket head, reducing tool slippage and improving assembly efficiency.
• Robust mechanical performance with a tensile strength of 40,000 psi and shear strength of 20,000 psi, suitable for demanding industrial loads.
• Compatibility with standard 5/64" hex tools for easy installation and removal, streamlining maintenance and assembly processes.
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring suitability for global markets and sensitive applications.

Professional Applications & Engineering Value

This 6061 aluminum shoulder screw is engineered to address common challenges in precision assemblies, such as misalignment and component wear. The 1/2" shoulder length acts as a precise spacer or pivot point, maintaining accurate alignment in machinery, robotics, and electronic enclosures. The knurled socket head provides superior grip, reducing the risk of tool cam-out during installation in tight spaces. With a 4-40 UNC coarse thread and Class 3A fit, it ensures quick assembly and high resistance to vibrational loosening in dynamic environments. The aluminum material offers excellent corrosion resistance and lightweight properties, making it ideal for aerospace, automotive, and consumer electronics where durability and weight savings are paramount. This screw delivers reliable performance in industrial applications requiring repeated adjustments and long service life.

Specification Summary & Compliance

This shoulder screw features a 4-40 UNC coarse thread with Class 3A thread fit for precise engagement, a shoulder diameter of 1/8" with a tolerance of -0.004" to -0.002", and a shoulder length of 1/2" with a tolerance of -0.005" to 0.005". Manufactured from 6061 aluminum, it meets RoHS 3 (2015/863/EU) compliance with exemption 6(b)-II and is REACH (EC 1907/2006) compliant, ensuring adherence to environmental and safety standards for industrial use.