S-8077A785 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh environments and extending service life.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress loads.
• Precise location and smooth rotation enabled by the 1/2" shoulder length with tight diameter tolerance, ensuring accurate component alignment.
• Secure and easy installation with a knurled socket head and 5/16" hex drive, providing excellent grip and reducing the risk of tool slippage.
• High-reliability thread engagement due to the Class 3A thread fit and coarse 3/8"-16 UNC thread, ensuring consistent fastening in demanding applications.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety for global supply chains.
• Enhanced durability and wear resistance from the Rockwell B79 hardness and robust material, reducing maintenance needs and downtime.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical challenges in precision assembly and machinery, where components require both secure fastening and precise pivoting or spacing. The 316 Stainless Steel material, combined with a Black Oxide finish, provides excellent resistance to corrosion and oxidation, making it suitable for applications in chemical processing, marine environments, and outdoor equipment. The knurled socket head and hex drive design facilitate quick, tool-friendly installation while minimizing cam-out, which is vital in automated or high-volume production lines. The defined shoulder diameter and length ensure accurate bearing surfaces and alignment in pulleys, gears, and linkages, reducing wear and preventing misalignment. With its Class 3A thread fit and coarse UNC thread, it offers robust holding power in vibrating systems, enhancing the reliability of industrial fasteners in automotive, aerospace, and heavy machinery sectors.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional tolerances, including a Class 3A thread fit for superior thread engagement and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 specifications for consistent manufacturing quality. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for use in various global markets.