S-96655A111 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and extended service life.
• Precise component alignment ensured by the 1/4" shoulder diameter with tight tolerances, reducing assembly errors and wear.
• High tensile strength of 70,000 psi provides reliable load-bearing capacity for demanding mechanical applications.
• Secure and easy installation with the hex socket drive and knurled head, offering excellent grip and torque transmission.
• Optimized for rotational parts through the partially threaded UNC design, allowing smooth pivot and bearing functions.
• Consistent performance backed by Rockwell B55 hardness, ensuring durability and resistance to deformation under stress.
• Compliance with environmental regulations including RoHS 3 and REACH, making it safe for various industrial sectors.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and rotational needs in machinery and assemblies. The 18-8 stainless steel material offers excellent resistance to rust and corrosion, making it suitable for applications in moist or chemically aggressive environments, such as food processing equipment, medical devices, and outdoor machinery. The 1/4" shoulder diameter with precise tolerances acts as a reliable pivot or spacer, minimizing misalignment and reducing wear on moving parts. Combined with a hex socket drive and knurled head, it ensures easy installation and secure fastening in tight spaces, enhancing assembly efficiency. The partially threaded design allows the unthreaded shoulder to serve as a bearing surface, ideal for gears, pulleys, and linkages where smooth rotation is essential. This screw delivers long-term reliability and performance in industrial shoulder fasteners applications, supporting high-stress operations without failure.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2B thread fit for consistent engagement. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring precise dimensional accuracy. Manufactured from 18-8 stainless steel with a hardness of Rockwell B55 and tensile strength of 70,000 psi, it meets rigorous industrial demands. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for global markets.