S-91268A213 1 1/4"-7 x 2 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel 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 load-bearing capacity with 150,000 PSI tensile strength for reliable performance in high-stress applications.
- Superior wear and deformation resistance due to Rockwell C33 hardness, ensuring long-term fastener integrity.
- Optimized for quick installation and high clamp force with coarse UNC threads and external hex drive for efficient assembly.
- Consistent, reliable thread engagement with Class 2A thread fit, reducing the risk of cross-threading and assembly errors.
- Full threading along the 2 1/2" length provides maximum grip and adjustability in various material thicknesses.
- Compliance with major industrial standards including ASME B18.2.1 and SAE J429, ensuring interchangeability and quality.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered for demanding industrial environments where failure is not an option. The 1 1/4"-7 UNC coarse thread design delivers superior holding power in soft materials or when rapid assembly is critical, while the fully threaded construction allows for precise adjustment and maximum thread engagement in thick assemblies. The external hex drive facilitates high-torque installation with standard tools, reducing installation time in heavy machinery, structural steel connections, and large equipment manufacturing. Manufactured from high-strength steel and heat-treated to Rockwell C33 hardness, it resists shear and tensile stresses in construction, automotive, and mining applications, providing a dependable heavy-duty fastening solution that minimizes downtime and maintenance costs.
Specification Summary & Compliance
This fastener features a 1 1/4"-7 UNC thread with Class 2A tolerance for consistent fit, a length of 2 1/2", and is fully threaded. It meets ASME B18.2.1 and SAE J429 specifications for dimensional and mechanical properties. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) is confirmed, ensuring adherence to environmental and safety regulations.
