S-91211A169 3/8"-16 x 3" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Thread-Locking Hex Head Screws
High-Strength Grade 8 Steel Thread-Locking Hex Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Vibration-resistant locking with a nylon patch thread locker maintains secure fastening from -55° to 250°F, ideal for machinery exposed to thermal cycling.
- Superior corrosion protection from zinc yellow-chromate plating extends service life in harsh industrial environments, minimizing maintenance needs.
- High-strength Grade 8 rating and Rockwell C33 hardness provide durability and resistance to wear under heavy loads.
- Coarse UNC threading and partial thread design enable quicker installation and better grip in a variety of materials.
- External hex drive compatibility allows for easy tightening with standard tools, streamlining assembly processes.
- Compliance with ASME B18.2.1 and SAE J429 ensures consistent quality and interchangeability for industrial use.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address common industrial challenges, such as vibration loosening and corrosion in demanding settings. The nylon patch thread locker provides reliable locking without compromising the zinc yellow-chromate plated steel’s resistance to rust, making it suitable for automotive, construction, and heavy machinery applications. Its UNC coarse thread and partially threaded design enhance grip and reduce installation time, while the high tensile strength and hardness ensure long-term stability under dynamic loads. By meeting rigorous standards, it delivers consistent performance in assembly lines and structural frameworks.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances for precise engagement and is manufactured in accordance with ASME B18.2.1 and SAE J429 specifications. It features a 3/8"-16 UNC coarse thread with a minimum thread length of 1 inch and a total length of 3 inches. The zinc yellow-chromate plating offers environmental protection, and the design complies with industry standards for dimensional accuracy and performance reliability.
