S-8077A585 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure.
• Enhanced durability and wear resistance from the black oxide finish, which also reduces light reflection and galling.
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for reliable performance under heavy loads.
• Precise, secure assembly thanks to Class 3A thread fit and UNC coarse threading, ensuring tight tolerances and vibration resistance.
• Easy installation and removal with a hex socket drive and knurled head, providing excellent grip and torque application.
• Accurate alignment and spacing due to the precisely machined shoulder with controlled diameter and length tolerances.
• Compliance with industry standards including ASME B18.3, RoHS, and REACH, guaranteeing quality and environmental safety.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical needs in industrial and mechanical assemblies where precision, strength, and corrosion resistance are paramount. The black oxide finish not only enhances durability but also minimizes friction and seizing in high-stress applications. With its UNC coarse thread and Class 3A fit, it provides reliable fastening in machinery, automotive components, and conveyor systems, reducing maintenance downtime. The knurled head and hex drive allow for efficient installation in tight spaces, making it ideal for pivots, guides, and rotating parts in demanding sectors like manufacturing, marine, and chemical processing.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise engagement and UNC coarse threading (5/16"-18) for robust performance. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. The shoulder features tight tolerances (e.g., diameter: -0.004" to -0.002", length: -0.005" to 0.005") for accurate alignment, supporting high-strength applications in regulated industries.