S-91829A403 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-lasting performance.
• Precise component alignment ensured by the 1/2" shoulder length with tight tolerances, reducing wear and vibration.
• Easy installation and removal with a standard socket head design, compatible with common tools for efficient assembly.
• Wide compatibility due to the 5/16"-18 UNC coarse thread and Class 2A fit, suitable for various industrial applications.
• Regulatory compliance meeting RoHS 3 and REACH standards, ensuring safety and environmental responsibility.
• Durable thread engagement with right-hand coarse threading, providing strong holding power in dynamic loads.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to address common industrial challenges such as misalignment and component wear in machinery. The 18-8 stainless steel material, combined with a passivated finish, offers excellent resistance to corrosion and oxidation, extending service life in demanding conditions like manufacturing equipment and automotive assemblies. The 1/2" shoulder length and precise shoulder diameter provide a stable pivot or bearing surface, ensuring accurate alignment in rotating parts, which minimizes friction and maintenance needs. With a socket head design, it allows for secure torque application, making it ideal for applications requiring high-strength fastening and easy access in confined spaces. This fastener is commonly used in industrial machinery, robotics, and precision instruments where reliability and durability are critical.

Specification Summary & Compliance

This shoulder screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent engagement and ease of assembly. Dimensions include a thread size of 5/16"-18, shoulder diameter of 3/8" with a tolerance of -0.001" to 0", and shoulder length of 1/2" with a tolerance of 0" to 0.002", ensuring precise fit in engineering applications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental standards for global use.