S-92620A125 3/8"-32 x 2 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: With a tensile strength of 150,000 PSI and Rockwell C33 hardness, this screw withstands extreme mechanical stress, reducing the risk of fastener failure in critical applications.
• Superior Corrosion Protection: The zinc yellow-chromate plating offers excellent resistance to rust and environmental degradation, extending service life in harsh industrial or outdoor settings.
• Precise Fastening Control: UNEF extra fine threads allow for finer adjustments and tighter clamping force, minimizing vibration loosening in precision assemblies.
• High-Strength Material Integrity: Manufactured from Grade 8 steel, this hex head screw ensures reliable performance under heavy loads and high-torque installation.
• Optimized Thread Engagement: Class 2A thread fit provides consistent, reliable mating with nuts and tapped holes, ensuring repeatable assembly quality.
• Enhanced Durability in Demanding Environments: The partially threaded design concentrates strength where needed, while the external hex drive allows for high-torque application with standard tools.
• Industry-Standard Compliance: Meets ASME B18.2.1 and SAE J429 specifications, guaranteeing dimensional accuracy and performance for regulated industrial applications.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for high-stress mechanical systems where failure is not an option. The extra fine UNEF thread (3/8"-32) provides superior resistance to vibrational loosening in precision equipment, automotive assemblies, and heavy machinery. The zinc yellow-chromate plating delivers reliable corrosion protection in demanding environments, from manufacturing plants to outdoor infrastructure. With its 150,000 PSI tensile strength and Rockwell C33 hardness, this partially threaded fastener maintains clamping force under extreme dynamic loads, solving common challenges in structural connections and high-pressure applications. The external hex drive design ensures compatibility with standard industrial tools, facilitating efficient installation and maintenance.

Specification Summary & Compliance

This screw features a Class 2A thread fit for consistent assembly tolerance and a 2 1/2" length with 1" minimum thread length. It complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The manufacturing process ensures adherence to industrial standards for Grade 8 strength classification, providing guaranteed performance in regulated applications.