S-93712A300 5/16"-24 x 4" Partially Threaded Studs with Cotter Pin

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments
• Secure locking mechanism provided by the integrated hairpin cotter pin, preventing accidental loosening under vibration
• Precise thread engagement ensured by the Class 2A thread fit and 5/16"-24 UNF fine threading for reliable fastening
• Enhanced durability and wear resistance from the Rockwell B89 hardness, extending the component's service life
• Optimized for easy installation with a 3" thread length and right-hand threading, compatible with standard UNF nuts
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries
• Versatile partial threading design allowing for both threaded engagement and smooth shaft applications

Professional Applications & Engineering Value

This partially threaded stud with cotter pin is engineered to solve critical fastening challenges in demanding applications. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making it suitable for outdoor machinery, marine equipment, and food processing systems. The 5/16"-24 UNF fine threading and Class 2A thread fit deliver superior vibration resistance and precise torque control, preventing joint failure in high-stress assemblies. The integrated hairpin cotter pin offers a quick and reliable locking solution for pivot points and axle assemblies, eliminating the need for additional locking hardware. This combination of corrosion-resistant properties and mechanical precision ensures long-term reliability in industrial automation, automotive, and heavy equipment sectors where fastener integrity is paramount.

Specification Summary & Compliance

This stud features a 5/16" shaft diameter with a tolerance of -0.005" to 0.005", 1" shaft length, and 3" thread length. It complies with UNF (Unified National Fine) thread standards and maintains a Class 2A thread fit for consistent interchangeability. The assembly includes a 0.141" cotter pin hole and a 4" hairpin cotter pin made from 18-8 Stainless Steel. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to strict environmental and safety standards for industrial use.