S-91273A184 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh 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.
• Precise location and smooth rotation enabled by the 3-1/2" shoulder with standard fit and tight tolerances.
• Secure and easy installation with a knurled socket head and 5/32" hex drive, providing excellent grip and torque transmission.
• Reliable and fast assembly using the coarse 5/16"-18 UNC thread with Class 2A fit for consistent engagement and vibration resistance.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global markets.
• Durable and wear-resistant material with a Rockwell B55 hardness, maintaining integrity through repeated use.

Professional Applications & Engineering Value

This 5/16"-18 UNC shoulder screw is engineered to address critical alignment and pivot point requirements in demanding industrial applications. The 3-1/2" shoulder length provides a precise bearing surface for components like gears, linkages, and pulleys, minimizing misalignment and wear. Manufactured from 18-8 Stainless Steel, it offers excellent resistance to corrosion and oxidation, which is vital in environments exposed to moisture or chemicals. The coarse UNC thread and Class 2A thread fit ensure quick, secure fastening with high vibration resistance, reducing maintenance needs. The knurled socket head with a hex drive allows for high-torque installation in confined spaces, making it a reliable choice for machinery, automotive assemblies, and precision equipment where durability and consistent performance are non-negotiable.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. The shoulder diameter is 5/16" with a tight tolerance of -0.004" to -0.002", and the shoulder length is 3-1/2" with a tolerance of -0.005" to 0.005" for precise engineering fits. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for use in regulated industries.