S-91273A191 5/16"-24 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.
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under significant loads.
• Precise alignment and spacing ensured by the machined shoulder with standard fit, reducing wear and simplifying assembly.
• Secure, non-slip fastening with a knurled socket head and hex drive, providing excellent grip during installation and removal.
• Fine UNF threading (5/16"-24) with Class 2A fit for vibration resistance and a tighter, more secure hold in demanding applications.
• Compliance with major regulations including RoHS 3 and REACH, ensuring safety and environmental standards are met for global supply chains.
• Consistent hardness (Rockwell B55) for durability and resistance to deformation, maintaining thread integrity over repeated use.

Professional Applications & Engineering Value

This 18-8 Stainless Steel shoulder screw is engineered to address critical challenges in precision machinery and assembly lines. The 5/16"-24 UNF fine thread and Class 2A fit provide exceptional resistance to loosening under vibration, making it ideal for rotating components and high-stress joints. The machined shoulder acts as a precise spacer or pivot point, eliminating misalignment in gears, linkages, and bearings. With a knurled socket head and hex drive, it ensures secure installation in confined spaces, reducing tool slippage and assembly time. Its high tensile and shear strength supports robust performance in automotive, aerospace, and industrial equipment, where reliability and corrosion resistance are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNF thread standards with a Class 2A thread fit for precise tolerance. Key dimensions include a shoulder diameter of 5/16" (tolerance: -0.004" to -0.002") and shoulder length of 3/8" (tolerance: -0.005" to 0.005"). 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 regulated industrial applications.