S-91247A507 7/8"-14 x 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
- Exceptional load-bearing capability with 120,000 psi tensile strength, ideal for high-stress structural connections.
- Superior corrosion resistance provided by zinc plating, extending service life in harsh industrial environments.
- Reliable, fine-thread engagement with 7/8"-14 UNF threading and Class 2A fit for vibration resistance and precise clamping.
- High-strength Grade 5 steel construction with Rockwell C25 hardness for excellent durability and fatigue resistance.
- Optimized for high-torque installation using the external hex drive and large 1 5/16" head width.
- Partial threading design allows for unthreaded shank strength where maximum shear resistance is required.
- Full regulatory compliance with ASME B18.2.1, SAE J429, RoHS 3, and REACH for guaranteed quality and safety.
Professional Applications & Engineering Value
This Grade 5 steel hex head screw is engineered to solve critical challenges in heavy machinery, construction, and industrial equipment assembly. The 7/8"-14 UNF fine thread provides superior resistance to loosening under dynamic loads and vibration, a common failure point in demanding applications. The zinc plating offers essential corrosion protection for outdoor or humid environments, while the partially threaded design ensures maximum shank strength in shear planes. With 120,000 psi tensile strength and Rockwell C25 hardness, this fastener maintains integrity under extreme pressure, making it ideal for structural frames, heavy-duty brackets, and high-performance mechanical systems where reliability is non-negotiable.
Specification Summary & Compliance
This hex head screw features precision Class 2A thread fit and 7/8"-14 UNF fine threading with a minimum thread length of 2 inches on a 4-inch overall length. It is manufactured to meet ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, guaranteeing safe use in regulated industries.
