S-96126A128 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh environments and extended service life
• Precise alignment and smooth rotation ensured by the 5/8" shoulder with tight diameter and length tolerances for reliable assembly performance
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B79 hardness for demanding mechanical applications
• Secure and efficient installation with a hex socket head and 5/64" drive, allowing high torque application in confined spaces
• Reliable thread engagement through 4-40 UNC coarse threads with Class 2A fit, providing consistent fastening and vibration resistance
• Environmental compliance assurance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Versatile right-hand threading compatible with standard UNC components for broad interoperability in machinery and equipment

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 316 Stainless Steel material, enhanced by a passivated finish, provides exceptional resistance to chemicals, moisture, and oxidation, making it suitable for industrial applications in manufacturing, automation, and marine environments. The precisely machined 5/8" shoulder length with minimal tolerances acts as a reliable axle or pivot, reducing wear on mating parts and maintaining component alignment under dynamic loads. Combined with the hex socket head design, it enables secure fastening in tight spaces, ensuring operational stability and reducing maintenance downtime in machinery, electronic enclosures, and precision instruments.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. The shoulder features a diameter of 1/8" with a tolerance of -0.001" to 0" and a length of 5/8" with 0" to 0.002" tolerance, ensuring precise assembly. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming its suitability for use in regulated and environmentally conscious industries.