S-92865A254 3/8"-16 x 4 1/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity with 120,000 psi tensile strength, ensuring reliable performance in high-stress industrial applications.
• Superior Corrosion Resistance from zinc plating, extending service life in harsh or outdoor environments.
• High Mechanical Durability due to Grade 5 steel construction and Rockwell C25 hardness, resisting wear and deformation.
• Easy Installation & Removal with external hex drive and coarse UNC threads, providing quick assembly and reduced cross-threading risks.
• Precise Thread Fit with Class 2A tolerance, ensuring consistent engagement and vibration resistance in machinery.
• Versatile Partial Threading allowing secure clamping where full thread engagement isn't required, ideal for structural connections.
• Regulatory Compliance meeting ASME B18.2.1 and SAE J429 standards, guaranteeing interchangeability and quality assurance.

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering value through its high-strength steel composition and zinc-plated finish, addressing common industrial challenges like joint failure and environmental degradation. The 3/8"-16 UNC coarse thread design ensures rapid installation in heavy machinery, construction frameworks, and automotive assemblies, while the partial threading provides optimal grip length for bolted connections requiring unthreaded shank sections. Its external hex drive accommodates standard wrenches, facilitating maintenance in confined spaces. Engineers specify this fastener for applications demanding consistent tensile strength and corrosion protection, such as equipment mounting, structural steelwork, and manufacturing fixtures, where reliability under dynamic loads is paramount.

Specification Summary & Compliance

This hex head screw maintains precise Class 2A thread fit per UNC standards, with dimensions including 4 1/4" length and 3/8"-16 coarse threading. It is manufactured in accordance with ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety standards for industrial use.