S-8077A482 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for high-stress applications.
• Precise component alignment ensured by the Class 3A thread fit and standard shoulder, minimizing assembly play.
• Enhanced wear resistance and reduced light reflection from the Black Oxide finish, improving durability and usability.
• Secure, non-slip fastening facilitated by the knurled socket head and hex drive, allowing for high-torque installation.
• Reliable performance in regulated industries with compliance to RoHS 3 and REACH environmental standards.
• Optimized for coarse threading applications using the 4-40 UNC thread, providing strong holding power and resistance to loosening.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address critical challenges in precision assembly and machinery. The Black Oxide finish not only enhances corrosion resistance but also reduces galling, a common issue in stainless fasteners during repeated use. The UNC coarse thread and Class 3A fit ensure tight tolerances and reliable engagement in components subject to vibration, making it ideal for industrial automation, aerospace linkages, and medical device manufacturing. The integral shoulder provides a precise datum for locating parts like gears and pulleys, eliminating the need for additional spacers and simplifying design. Its high tensile and shear strength guarantees integrity under dynamic loads, offering a durable solution for B2B technical procurement where failure is not an option.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A fit for precise thread engagement. Dimensional tolerances include a shoulder diameter of 1/8" with a tolerance of -0.004" to -0.002" and a shoulder length of 1 5/8" with a tolerance of -0.005" to 0.005". It is manufactured from 316 Stainless Steel with a hardness of Rockwell B79 and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.