S-91273A598 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 Stainless Steel construction and a protective black oxide finish, ensuring longevity in harsh environments.
• Exceptional mechanical strength with a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi for reliable performance under high stress.
• Precise alignment and secure fit enabled by the 1" shoulder length with tight tolerances (±0.005") and a standard shoulder fit, reducing assembly errors.
• Easy installation and removal with a knurled socket head and 5/32" hex drive, providing a secure grip and reducing tool slippage.
• Durable and coarse UNC threading with a Class 2A fit ensures robust engagement and resistance to vibration loosening in demanding applications.
• Compliance with major environmental regulations including RoHS 3 and REACH, making it suitable for global industrial and electronic applications.
• Versatile right-hand thread design with a Rockwell B55 hardness, offering consistent performance and wear resistance in repetitive use.

Professional Applications & Engineering Value

This 5/16"-18 UNC shoulder screw is engineered to address critical alignment and durability challenges in industrial settings. The 18-8 Stainless Steel material, combined with a black oxide finish, provides excellent resistance to corrosion and wear, making it ideal for machinery, automotive assemblies, and precision equipment. The 1" shoulder length with tight tolerances ensures accurate positioning of components, reducing misalignment and enhancing operational efficiency. Its coarse thread and Class 2A fit offer secure fastening in high-vibration environments, while the socket head with hex drive allows for easy installation in confined spaces. This screw delivers reliable performance in applications such as pivots, guides, and rotating assemblies, where precision and strength are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent engagement. The shoulder diameter and length maintain tight tolerances (e.g., shoulder length tolerance of -0.005" to 0.005"), ensuring precision in assembly. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible manufacturing. Manufactured from 18-8 Stainless Steel with a black oxide finish, it meets industry demands for durability and regulatory adherence in technical applications.