S-91286A213 3/8"-16 x 2 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With a 150,000 psi tensile rating, this screw withstands extreme loads, reducing the risk of failure in heavy-duty applications.
• Superior Corrosion Resistance – The zinc-flake coating provides long-lasting protection against rust and environmental degradation, extending service life in harsh conditions.
• High Hardness & Durability – Rockwell C33 hardness ensures the screw maintains its structural integrity under high stress and repeated use.
• Reliable Thread Engagement – UNC coarse threads and Class 2A thread fit offer quick assembly and secure fastening, minimizing cross-threading risks.
• Optimized for High-Torque Applications – The external hex drive and hex head design allow for easy installation with standard tools, even in confined spaces.
• Partial Threading for Versatility – The partially threaded design provides unthreaded shank strength where needed, ideal for materials requiring clamping force.
• Compliance with Industry Standards – Meets ASME B18.2.1 and SAE J429 specifications, ensuring consistent quality and performance in regulated environments.

Professional Applications & Engineering Value

Engineered for demanding industrial and construction settings, this Grade 8 hex head screw addresses critical challenges such as joint integrity under dynamic loads and exposure to corrosive elements. The steel construction, combined with a zinc-flake coated finish, ensures reliable performance in structural frameworks, heavy machinery, and automotive assemblies where vibration resistance and longevity are paramount. The 3/8"-16 UNC coarse thread facilitates rapid installation in coarse-grained materials, while the partially threaded shank enhances grip and prevents loosening. By integrating high tensile strength and precise thread fit, this fastener minimizes maintenance needs and downtime, delivering cost-effective solutions for industrial fastening projects that require uncompromising reliability.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse threading per industry norms. It conforms to ASME B18.2.1 and SAE J429 manufacturing specifications, guaranteeing mechanical properties and interchangeability. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global supply chain integration.