S-91273A179 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Exceptional strength and durability offering 70,000 psi tensile strength and Rockwell B55 hardness to withstand high-stress applications.
• Precise component alignment ensured by the 2 1/4" shoulder length with tight tolerances, reducing wear and misalignment in assemblies.
• Reliable and secure fastening with Class 2A thread fit and 5/16"-18 UNC coarse thread for easy installation and vibration resistance.
• Enhanced grip and tool engagement from the knurled socket head and hex drive, preventing slippage during tightening in confined spaces.
• Compliance with global regulations including RoHS 3 and REACH, ensuring safety and environmental standards for international supply chains.
• Optimized for heavy-duty use with a minimum shear strength of 35,000 psi, providing dependable performance in demanding mechanical systems.

Professional Applications & Engineering Value

This socket head shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial settings. The 18-8 stainless steel material resists corrosion and oxidation, making it suitable for applications in machinery, automotive, and electronics where exposure to moisture or chemicals is common. The 2 1/4" shoulder length with precise tolerances allows for accurate positioning of moving parts, such as in pivots, gears, and linkages, reducing friction and extending component life. The coarse UNC thread and Class 2A fit facilitate quick assembly and disassembly while maintaining tightness under vibration. Combined with a knurled head for improved tool grip, this screw ensures reliable performance in high-stress environments, minimizing downtime and maintenance costs for B2B clients.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 2A fit for standard tolerance and easy installation. The shoulder diameter is 5/16" with a tolerance of -0.004" to -0.002", and the shoulder length is 2 1/4" with a tolerance of -0.005" to 0.005", ensuring precise dimensional accuracy. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety standards for industrial use.