S-91211A196 1/2"-13 x 4" 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
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Vibration-resistant locking with a durable nylon patch that maintains integrity across a wide temperature range from -55°F to 250°F, preventing loosening in dynamic environments.
- Exceptional tensile strength of 150,000 psi and Rockwell C33 hardness for reliable performance in high-stress, heavy-duty applications.
- Corrosion-resistant zinc yellow-chromate plating enhances longevity and protects against harsh industrial conditions.
- Precise Class 2A thread fit with UNC coarse threading ensures easy installation and secure fastening in various materials.
- Partially threaded design allows for controlled clamping force and reduced risk of cross-threading.
- External hex drive provides high torque capability and straightforward installation with standard tools.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability for industrial use.
Professional Applications & Engineering Value
Engineered for demanding environments, this Grade 8 hex head screw combines high-strength steel and a nylon patch thread locker to address common industrial challenges like vibration-induced loosening and thermal cycling. The zinc yellow-chromate plating offers superior corrosion resistance, extending service life in outdoor or chemically exposed settings. With its UNC coarse threads and Class 2A fit, it ensures quick assembly and reliable grip in metals and composites, making it ideal for machinery, automotive, and construction applications where heavy-duty fastening and temperature resilience are critical. Its partial threading design minimizes stress concentration, enhancing joint integrity in structural assemblies.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances and UNC coarse thread standards, with specifications meeting ASME B18.2.1 and SAE J429 for dimensional consistency and performance. It is manufactured from zinc yellow-chromate plated steel and complies with industry regulations for reliability in heavy-duty applications.
