S-91273A925 5/8"-11 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and reducing long-term maintenance costs.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi minimum shear strength for reliable performance in high-stress applications.
• Precise and secure assembly ensured by the Class 2A thread fit and standard shoulder fit, minimizing play and vibration-related failures.
• Enhanced grip and tool engagement from the knurled socket head and 5/16" hex drive, allowing for efficient installation and removal even in tight spaces.
• Robust unthreaded shoulder section with a 5/8" diameter and tight tolerances, providing accurate alignment and acting as a pivot or bearing surface.
• Wide compatibility with coarse 5/8"-11 UNC threads, making it suitable for a broad range of standard industrial components and assemblies.
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safety and regulatory acceptance for international markets.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical challenges in machinery and equipment design. The 18-8 Stainless Steel material provides excellent resistance to rust and oxidation, which is vital for applications in moist or chemically aggressive environments, such as food processing, marine, or outdoor machinery. The knurled socket head combined with a 5/16" hex drive ensures that the fastener can be securely tightened without slippage, reducing the risk of tool damage and stripped heads during high-torque assembly. The unthreaded shoulder serves as a precise locating dowel or axle, maintaining alignment between parts and reducing wear on threaded sections. This design is particularly valuable in precision assemblies like rotating shafts, pulleys, and linkages, where misalignment can lead to premature failure and costly downtime. By integrating high tensile strength and Class 2A thread fit, this shoulder screw delivers reliable clamping force and vibration resistance, enhancing the longevity and safety of the overall assembly.

Specification Summary & Compliance

This shoulder screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent and reliable engagement. The shoulder diameter is maintained at 5/8" with a tight tolerance of -0.004" to -0.002", and the shoulder length is 5/8" with a tolerance of -0.005" to 0.005", ensuring precise dimensional control. Manufactured from 18-8 Stainless Steel with a hardness of Rockwell B55, it meets mechanical performance criteria for industrial use. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to strict environmental and safety standards for hazardous substance restrictions.