S-91211A226 3/4"-10 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
- Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Built-in vibration resistance with the nylon patch thread locker maintains secure fastening in dynamic environments from -55° to 250° F.
- High durability and corrosion resistance from zinc yellow-chromate plated steel extends service life in harsh conditions.
- Precise Class 2A thread fit with UNC coarse threading allows for easier assembly and better grip in various materials.
- Robust Grade 8 classification and Rockwell C33 hardness provide consistent strength and wear resistance for heavy-duty use.
- External hex drive design enables straightforward installation and removal with standard tools, improving workflow efficiency.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees quality and interoperability in professional settings.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and high tensile demands. The nylon patch thread locker securely locks threads, preventing back-off in machinery, automotive, and construction applications where constant motion and temperature fluctuations occur. Made from zinc yellow-chromate plated steel, it offers excellent corrosion protection, reducing maintenance needs in exposed environments. The coarse UNC thread and partial threading enhance grip and distribution of load, making it ideal for heavy equipment, structural assemblies, and other scenarios requiring high-strength fasteners that endure rigorous use without compromising integrity.
Specification Summary & Compliance
This fastener features a Class 2A thread fit for consistent accuracy and meets ASME B18.2.1 and SAE J429 specifications, ensuring dimensional precision and performance reliability. It complies with common industrial standards for hex head screws, with a tensile strength of 150,000 psi and hardness of Rockwell C33. The product adheres to RoHS and REACH regulations, supporting safe and sustainable usage in global markets.
