S-95362A217 5/16"-18 x 2" ASME B18.2.1, SAE J429, ASTM A354BD, MS90728-40 Mil. Spec. High-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Optimized torque transmission through the external hex drive design, ensuring secure installation and removal
• Precise thread engagement with Class 2A UNC coarse threads, facilitating faster assembly and reduced cross-threading risk
• Enhanced durability from Rockwell C33 hardness, maintaining structural integrity under repeated stress
• Versatile partial threading allowing for both clamping and alignment functions in various assembly configurations
• Regulatory compliance assurance meeting multiple industry standards for quality and safety consistency

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment where vibration resistance and permanent fastening are paramount. The zinc yellow-chromate plated finish provides exceptional barrier protection against oxidation and chemical exposure, significantly reducing maintenance frequency in manufacturing plants, construction sites, and automotive applications. The 5/16"-18 UNC coarse thread configuration ensures rapid installation while maintaining superior pull-out strength, while the partially threaded design allows for precise clamping force distribution. Engineered to withstand extreme mechanical stress, these high-strength bolts prevent joint failure in critical assemblies, offering reliable performance where safety margins cannot be compromised.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances with UNC coarse threading (5/16"-18) and partial threading up to 7/8" minimum thread length. Fully compliant with ASME B18.2.1, SAE J429, and ASTM A354BD specifications, ensuring dimensional accuracy and mechanical properties. Meets REACH (EC 1907/2006) compliance requirements and carries identification MS90728-40 for traceability and quality assurance.