S-91273A585 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 mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Precision alignment and smooth rotation enabled by the 1-1/4" shoulder with controlled diameter tolerance, reducing wear on mating parts.
• Secure and easy installation with a knurled socket head and 5/32" hex drive, providing excellent grip and torque transmission.
• Wide compatibility and reliable fastening with 5/16"-18 UNC coarse threads and Class 2A fit, ensuring consistent engagement in various applications.
• Enhanced durability from a Rockwell B55 hardness rating, resisting deformation and maintaining thread integrity.
• Compliance with global environmental standards including RoHS 3 and REACH, making it suitable for regulated industries and international supply chains.

Professional Applications & Engineering Value

This 18-8 Stainless Steel shoulder screw is engineered to address critical alignment and load-bearing challenges in precision machinery and industrial assemblies. The 1-1/4" shoulder length provides a stable bearing surface, minimizing misalignment and reducing wear on components like gears, pulleys, and linkages. Its UNC coarse threads facilitate quick assembly and disassembly, while the Class 2A thread fit ensures consistent fastening without binding. The knurled socket head with a hex drive allows for high-torque installation in confined spaces, enhancing efficiency in automated production lines. Made from corrosion-resistant stainless steel, it withstands exposure to moisture, chemicals, and temperature variations, making it a reliable choice for robotics, conveyor systems, and packaging equipment where durability and precision are paramount.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with a Class 2A fit for standard tolerance and reliable engagement. The shoulder diameter is maintained within a tight tolerance of -0.004" to -0.002", and the shoulder length is controlled to -0.005" to 0.005" for precise application. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in environmentally conscious industries.