S-8077A762 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure.
• Enhanced durability and wear resistance from the black oxide finish, which also reduces light reflection and provides a sleek appearance.
• High tensile and shear strength (70,000 psi tensile, 35,000 psi shear) ensures reliable performance under heavy loads and mechanical stress.
• Precise Class 3A thread fit guarantees secure, vibration-resistant fastening in critical assemblies.
• Easy installation and removal with a 5/16" hex drive socket head, allowing for high torque application without slippage.
• Accurate shoulder positioning with a 4 1/4" shoulder length and tight tolerances, enabling consistent alignment in rotating parts and pivoting mechanisms.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common challenges in industrial settings, such as corrosion from moisture or chemicals and misalignment in moving parts. The black oxide finish not only enhances corrosion resistance but also minimizes galling during assembly, extending the fastener's lifespan. With a coarse UNC thread and Class 3A fit, it provides quick, secure fastening in high-vibration applications like machinery, automotive systems, and conveyor equipment. The precise shoulder diameter and length ensure stable support for bearings, gears, and linkages, reducing wear and maintenance costs. Ideal for demanding environments, this screw combines material strength with regulatory compliance to deliver reliable performance in OEM and MRO applications.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC coarse thread with Class 3A fit for tight tolerances and reliable engagement. Manufacturing adheres to ASME B18.3 specifications, ensuring dimensional accuracy for the shoulder diameter (5/8" with -0.004" to -0.002" tolerance) and length (4 1/4" with -0.005" to 0.005" tolerance). The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and environmentally responsible industrial use.