S-91273A258 5/8"-11 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and reducing maintenance costs.
• High mechanical strength and durability offering a tensile strength of 70,000 psi and a shear strength of 35,000 psi for reliable performance in heavy-duty applications.
• Precise and secure shaft alignment provided by the 2-1/2" shoulder length with tight tolerances, minimizing part wear and ensuring smooth rotational movement.
• Easy and secure installation with a 5/16" hex socket drive and knurled head, allowing for high torque application without slippage and improved grip during handling.
• Wide compatibility and reliable fastening due to the 5/8"-11 UNC coarse thread with Class 2A fit, ensuring consistent engagement and vibration resistance.
• Consistent hardness and wear resistance with a Rockwell B55 rating, providing long-lasting performance and reducing the need for frequent replacements.
• Compliance with environmental and safety standards including RoHS 3 and REACH, making it suitable for global supply chains and sensitive applications.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical challenges in precision assembly and rotational systems. The 18-8 stainless steel material provides excellent resistance to corrosion and oxidation, which is vital in environments exposed to moisture or chemicals, thereby extending the lifespan of machinery. The 2-1/2" shoulder length with minimal tolerance variations ensures accurate positioning of components like bearings, pulleys, and gears, reducing misalignment and subsequent wear. The hex socket drive and knurled head facilitate secure, high-torque installation in confined spaces, common in automotive, aerospace, and industrial equipment. Its coarse UNC threads and Class 2A fit offer quick assembly and reliable holding power, making it a top choice for applications demanding both strength and precision, such as in conveyor systems or robotic arms.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and a shoulder diameter tolerance of -0.004" to -0.002" with length tolerance of -0.005" to 0.005" to ensure accurate alignment. Manufactured in accordance with UNC thread standards, it guarantees compatibility with standard nuts and components. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and regulated industries without hazardous substances.