S-97768A133 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments.
• Superior thread engagement and reliability due to Class 3A fit and coarse UNC thread, minimizing the risk of cross-threading.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring durability under heavy loads.
• Secure, non-slip installation provided by the knurled head and 5/64" hex socket drive, allowing for high torque application.
• Enhanced wear resistance and reduced galling from the black oxide finish, extending the screw's service life.
• Precise component alignment enabled by the standard shoulder fit and consistent shoulder diameter and length tolerances.
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe and responsible use in regulated industries.

Professional Applications & Engineering Value

This 4-40 UNC thread shoulder screw is engineered to solve critical alignment and fastening challenges in precision assemblies. The 18-8 stainless steel material provides excellent resistance to corrosion and oxidation, making it suitable for machinery, automotive, and electronic applications exposed to moisture or chemicals. The black oxide finish not only adds an extra layer of protection against wear but also reduces friction during installation. With a Class 3A thread fit and coarse UNC thread, it ensures quick assembly and reliable holding power, while the hex socket drive and knurled head allow for secure tightening in confined spaces. Its robust 70,000 psi tensile strength and precise shoulder dimensions make it ideal for pivots, spacers, and guides in high-stress industrial equipment, reducing maintenance downtime and improving overall system reliability.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for superior thread engagement and UNC coarse thread specifications. Key tolerances are maintained for the shoulder diameter (-0.004" to -0.002") and length (-0.005" to 0.005") to ensure consistent performance. The product is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and regulated industrial applications.