S-91268A298 3/8"-16 x 3" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Grade 8 classification and 150,000 PSI tensile strength, ensuring reliable performance under high stress.
• Superior durability and wear resistance due to Rockwell C33 hardness, providing long-lasting service in harsh industrial environments.
• Secure and precise fastening with Class 2A thread fit and UNC coarse threads, reducing the risk of cross-threading and ensuring consistent clamping force.
• Optimized for easy installation and removal featuring an external hex drive and hex head design, allowing for high torque application with standard tools.
• Versatile partial threading for improved grip in specific joint designs, minimizing thread damage and enhancing assembly efficiency.
• Compliance with major industry standards including ASME B18.2.1 and SAE J429, guaranteeing interchangeability and reliability in mechanical systems.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, ensuring safety and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and industrial equipment where high tensile strength and durability are paramount. The steel material combined with Rockwell C33 hardness resists deformation and fatigue under dynamic loads, while the 3/8"-16 UNC coarse thread and Class 2A fit provide excellent vibration resistance and ease of assembly in coarse-alignment scenarios. The partially threaded design concentrates stress away from the shank, reducing the risk of shear failure in bolted joints. Ideal for securing structural components, motor mounts, and heavy-duty frames, this external hex drive screw ensures reliable fastening in applications requiring 150,000 PSI tensile strength and compliance with ASME B18.2.1 specifications, delivering consistent performance and reducing maintenance downtime.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards with a Class 2A thread fit and UNC coarse thread profile, ensuring compatibility and performance. It meets ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners, confirming mechanical properties and manufacturing consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable use in industrial and construction sectors.