S-91247A899 7/8"-9 x 7 1/2" 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 load-bearing capacity with 120,000 psi tensile strength for reliable performance in high-stress applications.
- Superior corrosion resistance provided by zinc plating, extending service life in harsh industrial environments.
- Optimized for high-torque installation thanks to the external hex drive and robust hex head design for secure fastening.
- Enhanced durability and wear resistance from Rockwell C25 hardness, reducing the risk of stripping or deformation.
- Secure and precise thread engagement with Class 2A thread fit and coarse UNC threading, minimizing cross-threading risks.
- Versatile partial threading allows for effective clamping across a 7 1/2" length without unnecessary thread engagement.
- Compliance with major industry standards including ASME B18.2.1 and SAE J429, ensuring consistent quality and interchangeability.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical challenges in heavy machinery, structural steel connections, and industrial equipment assembly. The zinc plated steel construction combats corrosive elements, while the coarse UNC thread and Class 2A fit provide rapid assembly and reliable holding power, even in vibrating environments. Its partial threading concentrates clamping force where needed, making it ideal for securing thick materials or components requiring a non-threaded shank. With a 7/8"-9 thread size and external hex drive, it delivers the high torque capability needed for demanding industrial fasteners applications, ensuring long-term structural integrity.
Specification Summary & Compliance
This fastener adheres to Class 2A thread tolerance per UNC standards and is manufactured in compliance with ASME B18.2.1 and SAE J429 specifications. It is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
