S-97381A101 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• High-strength aluminum construction provides excellent durability with 40,000 psi tensile strength and 20,000 psi shear strength, ideal for load-bearing applications without excessive weight.
• Precision Class 3A thread fit ensures reliable, secure fastening with minimal backlash in assemblies requiring tight tolerances.
• Knurled socket head with 5/64" hex drive offers superior grip and torque application, reducing tool slippage during installation.
• Coarse 4-40 UNC threading allows for quick assembly and disassembly, even in environments with debris or vibration.
• Standard shoulder diameter and length provides consistent alignment and spacing in machinery, jigs, and pivoting mechanisms.
• RoHS 3 and REACH compliance guarantees environmental safety and regulatory adherence for global industrial supply chains.
• Right-hand thread design simplifies installation with standard tools, enhancing efficiency in high-volume production settings.

Professional Applications & Engineering Value

This 6061 aluminum shoulder screw is engineered to address common industrial challenges like component misalignment, wear from repeated adjustments, and the need for lightweight yet robust fastening. The knurled socket head and hex drive ensure secure tool engagement, minimizing installation errors in automated or manual assembly lines. With its coarse UNC threads and Class 3A fit, it provides reliable performance in applications such as precision machinery, electronic enclosures, and pivoting joints, where vibration resistance and easy maintenance are critical. The aluminum material reduces overall weight without sacrificing tensile and shear strength, making it ideal for aerospace, automotive, and robotics sectors that demand compliance with RoHS and REACH standards.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precise engagement. Dimensions include a thread size of 4-40, thread length of 5/32", head diameter of 0.25", and shoulder length of 1/8" with tight tolerances (e.g., shoulder diameter tolerance of -0.004" to -0.002"). It is manufactured to meet RoHS 3 (2015/863/EU) compliance under exemption 6(b)-II and REACH (EC 1907/2006) requirements, ensuring suitability for regulated industrial environments.