S-93691A110 4-40 MS51576-1, NASM51576 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-lasting performance.
• Precise alignment and positioning ensured by the 1/8" shoulder diameter with tight tolerance for stable assembly in precision applications.
• Easy installation and removal with a 5/64" hex socket drive, allowing for secure tool engagement and efficient maintenance.
• Wide compatibility through UNC coarse threads and Class 2A fit, providing consistent fastening in various industrial equipment.
• Regulatory compliance meeting MS51576-1, RoHS 3, and REACH standards for safe, environmentally conscious use in global markets.
• Durable smooth head design reducing friction and wear during operation, enhancing the screw's service life.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical challenges in precision assemblies, such as misalignment and component wear. Crafted from 18-8 stainless steel with a passivated finish, it resists corrosion in demanding environments like manufacturing and electronics. The 1/8" shoulder diameter with precise tolerances ensures accurate positioning in machinery, reducing vibration and improving operational stability. Its coarse UNC threads and Class 2A fit facilitate quick, reliable fastening, while the socket head design allows for easy access in confined spaces. Ideal for applications in aerospace, automotive, and industrial equipment, this screw enhances durability and minimizes downtime, delivering consistent performance under high-stress conditions.

Specification Summary & Compliance

This shoulder screw adheres to strict dimensional standards, including a Class 2A thread fit for precise engagement and a shoulder diameter tolerance of -0.001" to 0". It meets MS51576-1 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industrial reliability. Manufactured with right-hand UNC threads and a tensile strength of 70,000 psi, it is suitable for high-performance applications requiring consistent quality and durability.