S-91283A236 1 1/4"-7 x 3" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 tensile strength of 100,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Grade 5 steel construction with Rockwell C19 hardness provides superior durability and resistance to wear, extending service life in demanding environments.
- Coarse UNC threads with Class 2A fit offer easier, faster assembly and reduced cross-threading risks, saving time during installation.
- Fully threaded design maximizes grip and load distribution along the entire length, enhancing joint stability.
- External hex drive and hex head allow for high-torque application with standard tools, ensuring secure fastening in heavy-duty settings.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability in industrial assemblies.
- RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for global supply chains.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical challenges in heavy machinery, construction, and structural applications where vibration and dynamic loads are common. The coarse UNC thread and Class 2A thread fit minimize loosening under stress, while the fully threaded design ensures uniform stress distribution, preventing joint failure. Made from high-strength steel with a Rockwell C19 hardness, it resists deformation and corrosion in harsh environments. Ideal for industrial fastening in equipment frames, automotive components, and infrastructure projects, this screw delivers reliable performance, reduces maintenance downtime, and supports long-term operational safety.
Specification Summary & Compliance
This fastener features a 1 1/4"-7 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy, ensuring consistent engagement and load-bearing capacity. It meets ASME B18.2.1 and SAE J429 specifications for mechanical properties and manufacturing standards. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in regulated industries without hazardous substances.
