S-91247A406 9/16"-18 x 2 1/4" 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
- Superior load-bearing capacity with 120,000 psi tensile strength, ideal for high-stress industrial assemblies.
- Enhanced corrosion resistance from zinc plating, extending service life in harsh or outdoor environments.
- Reliable fine thread engagement with UNF 9/16"-18 threads and Class 2A fit, ensuring vibration resistance and secure fastening.
- Optimized for high-torque applications thanks to the external hex drive and 13/16" head width for easy wrench access.
- Consistent mechanical performance backed by Grade 5 certification and Rockwell C25 hardness, reducing risk of stripping or shear.
- Versatile partial threading design allows for both clamping and alignment functions in machinery and structural projects.
- Broad regulatory compliance meets ASME B18.2.1, SAE J429, RoHS 3, and REACH, ensuring global supply chain suitability.
Professional Applications & Engineering Value
This Grade 5 steel hex head screw is engineered to address common industrial challenges such as joint failure under dynamic loads and corrosion-induced degradation. The UNF fine thread profile and Class 2A thread fit provide superior resistance to loosening in vibrating equipment, while the zinc plated finish offers a protective barrier against moisture and chemicals. With a partially threaded shank, it is perfectly suited for applications requiring both clamping force and unthreaded shear plane support—commonly found in heavy machinery, automotive assemblies, and construction frameworks. Its external hex drive and substantial head dimensions facilitate quick installation and high torque transmission, reducing assembly time and improving project efficiency.
Specification Summary & Compliance
This fastener adheres to Class 2A thread tolerance per UNF standards, ensuring precise fit and interchangeability. Manufacturing and material specifications conform to ASME B18.2.1 and SAE J429 Grade 5 requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in regulated markets and environmentally conscious supply chains.
