S-91247A509 7/8"-14 x 3 3/4" 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 for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
- Precise thread engagement with Class 2A fit and UNF fine pitch for secure fastening and vibration resistance
- High-strength Grade 5 steel construction with Rockwell C25 hardness for durability and repeated use
- Optimized torque transmission through external hex drive and large 1 5/16" head width
- Reduced assembly weight with partial threading while maintaining full strength in critical sections
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3 and REACH standards for global industrial use
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where high tensile strength and vibration resistance are paramount. The 7/8"-14 UNF fine thread configuration provides superior clamping force distribution, while the zinc plated finish protects against corrosion in demanding environments. The partially threaded design concentrates strength where needed most, making it ideal for applications requiring precise load-bearing capabilities. With its external hex drive and substantial head dimensions, this fastener ensures efficient installation and removal in confined spaces, reducing maintenance downtime across manufacturing, construction, and automotive sectors.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNF fine pitch threading (7/8"-14). Complies with ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features include 3 3/4" overall length, 2" minimum thread length, and right-hand thread direction for standard industrial applications.
