S-91268A306 3/8"-16 x 3 1/2" 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 from Rockwell C33 hardness, providing long service life in harsh industrial environments.
• Optimized clamping force and vibration resistance due to the coarse UNC thread and partial threading design, reducing the risk of loosening.
• Easy installation and removal with an external hex drive and standard 9/16" head width, compatible with common tools for efficient assembly.
• Precise and reliable thread engagement with Class 2A thread fit, ensuring consistent performance and reducing assembly errors.
• Compliance with major industry standards including ASME B18.2.1 and SAE J429, guaranteeing quality and interoperability in professional settings.
• Safe for regulated industries as they are RoHS 3 and REACH compliant, meeting environmental and safety requirements.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to solve critical fastening challenges in heavy-duty industrial applications. Made from high-strength steel and featuring a 3/8"-16 UNC coarse thread, it delivers superior clamping force and vibration resistance, making it ideal for machinery, construction, and automotive assemblies where reliability is paramount. The partially threaded design concentrates stress effectively, reducing the risk of fatigue failure under dynamic loads. With an external hex drive and precise Class 2A thread fit, it ensures quick, secure installation with standard tools, minimizing downtime in production lines. These screws are built to withstand extreme conditions, offering a robust solution for engineers seeking durability and compliance in their industrial fasteners.

Specification Summary & Compliance

This screw adheres to precise dimensional standards with a Class 2A thread fit and UNC coarse thread specifications. It meets ASME B18.2.1 and SAE J429 manufacturing standards, ensuring consistent quality and performance. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and environmentally responsible use in global markets.