S-91211A191 1/2"-13 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
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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 nylon patch ensures secure fastening in high-vibration environments from -55° to 250°F
- Exceptional tensile strength of 150,000 psi provides reliable performance in heavy-duty applications
- Superior corrosion protection through zinc yellow-chromate plating extends service life in harsh conditions
- Precision Class 2A thread fit enables smooth installation and consistent engagement
- High-strength Grade 8 rating with Rockwell C33 hardness guarantees durability under extreme loads
- External hex drive design allows for high torque application with standard tools
- Partially threaded UNC coarse configuration optimizes clamping force distribution
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 8 hex head screws deliver exceptional performance where vibration resistance and high tensile strength are critical. The nylon patch thread locker technology effectively prevents loosening in machinery, equipment, and structural assemblies exposed to constant motion or thermal cycling. The zinc yellow-chromate plated steel construction provides superior corrosion protection, making these heavy-duty fasteners ideal for outdoor equipment, automotive systems, and industrial machinery. The UNC coarse thread design with Class 2A fit ensures reliable engagement in various materials while the external hex drive facilitates efficient installation with standard tools, reducing assembly time and labor costs.
Specification Summary & Compliance
This 1/2"-13 x 3" hex head screw features UNC coarse threading with Class 2A thread fit for precision engagement and meets ASME B18.2.1 and SAE J429 Grade 8 specifications. The fastener is manufactured with partially threaded design and complies with industry standards for dimensional accuracy and mechanical properties. The zinc yellow-chromate plating provides environmental protection while maintaining compliance with industrial fastener requirements for heavy-duty applications.
