S-91273A308 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and mechanical stress
• Precision Class 2A thread fit guarantees smooth assembly and secure fastening in demanding applications
• Knurled head texture provides enhanced grip for manual adjustments without compromising the hex drive
• 1" shoulder length with tight tolerances offers accurate alignment and spacing in mechanical assemblies
• RoHS 3 and REACH compliance meets stringent environmental regulations for global manufacturing
• Rockwell B55 hardness delivers excellent durability and resistance to wear over extended use

Professional Applications & Engineering Value

This 5/16"-18 UNC thread shoulder screw is engineered to address critical alignment and mounting challenges in industrial and mechanical assemblies. The 18-8 stainless steel material provides superior corrosion resistance, while the 1" shoulder length with precise tolerances ensures accurate component positioning, reducing misalignment and vibration issues. The coarse UNC thread and Class 2A fit facilitate quick installation and reliable thread engagement, making it ideal for machinery, automotive, and precision equipment where durability and compliance are paramount. The knurled head enhances handling, and the hex drive allows for secure tightening in confined spaces.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. Shoulder diameter and length tolerances are tightly controlled (e.g., shoulder diameter: -0.004" to -0.002", shoulder length: -0.005" to 0.005") to ensure precise assembly. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious industrial applications.