S-92327A113 5/16"-18 x 3" ASME B18.2.1, SAE J429 Square Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc yellow-chromate plating for extended service life in demanding environments
• Superior tensile strength rated at 120,000 PSI ensures reliable performance under medium to high stress applications
• Precise Class 3A thread fit provides consistent engagement and vibration resistance in assembled components
• External square drive design allows for high-torque installation with standard tools, reducing stripping risks
• Full threading along the 3" length offers maximum grip and adjustment flexibility in various material thicknesses
• Rockwell C25 hardness maintains structural integrity and prevents deformation during repeated use
• Industry-standard UNC coarse threads enable quick assembly and disassembly in maintenance operations

Professional Applications & Engineering Value

Engineered for industrial machinery, structural frameworks, and heavy equipment assembly, these SAE Grade 5 square head screws address critical fastening challenges where vibration resistance and load-bearing capacity are paramount. The zinc yellow-chromate finish combats oxidation in humid or outdoor settings, while the UNC coarse thread profile prevents cross-threading during high-speed installations. With fully threaded shanks and external square drive heads, they provide uniform clamping force and withstand torque stresses in construction, automotive, and manufacturing applications where medium strength fasteners with verified compliance are required.

Specification Summary & Compliance

Manufactured to Unified Standard Class 3A thread tolerances with 5/16"-18 UNC coarse threading and right-hand orientation. Complies with ASME B18.2.1 dimensional specifications and SAE J429 material standards for Grade 5 fasteners. The steel construction and plating process adhere to industry regulations for mechanical performance and environmental safety.