S-91273A297 1"-8 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and reducing long-term replacement costs.
• Superior mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance in high-stress applications.
• Precise alignment and smooth rotation enabled by the 5" long, standard-fit shoulder with tight diameter tolerance for consistent assembly quality.
• Secure and efficient installation using the 1/2" hex socket drive and knurled head, which provides excellent grip and prevents tool slippage.
• Broad compatibility and interchangeability with 1"-8 UNC coarse threads and Class 2A thread fit, ensuring easy integration into existing designs.
• Enhanced durability and wear resistance from a Rockwell B55 hardness, maintaining structural integrity under repeated loads.
• Compliance with global environmental standards including RoHS 3 and REACH, supporting sustainable and responsible manufacturing practices.

Professional Applications & Engineering Value

This 1"-8 UNC shoulder screw is engineered to address critical challenges in precision machinery and industrial assemblies. The 18-8 Stainless Steel material provides excellent resistance to corrosion and oxidation, making it suitable for applications in chemical processing, marine equipment, and food machinery where environmental factors are a concern. The 5" shoulder length and precise shoulder diameter act as a reliable pivot or spacer, ensuring accurate alignment of moving parts such as gears, levers, and bearings, which minimizes wear and reduces maintenance downtime. Combined with the hex socket head and knurled texture, it allows for secure torque application in confined spaces, enhancing assembly efficiency. Its right-hand coarse threads and Class 2A fit offer quick installation and robust holding power, vital for heavy-duty applications like automotive jigs, conveyor systems, and robotic arms, where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. The shoulder features a diameter of 1" with a tolerance of -0.004" to -0.002" and a length of 5" with a tolerance of -0.005" to 0.005", ensuring precise dimensional accuracy. Manufactured from 18-8 Stainless Steel with a hardness of Rockwell B55, it meets mechanical performance criteria including 70,000 psi tensile strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial use.