S-91247A478 3/4"-16 x 2 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
- High tensile strength of 120,000 psi ensures reliable performance in demanding industrial applications
- Zinc plating provides superior corrosion resistance for extended service life in harsh environments
- Grade 5 steel construction with Rockwell C25 hardness delivers exceptional durability and load-bearing capacity
- Fine UNF thread design (3/4"-16) offers superior vibration resistance and precise fastening control
- External hex drive with 1 1/8" head width enables easy installation with standard tools
- Class 2A thread fit ensures consistent, reliable engagement with mating components
- Partial threading provides optimal grip length while maintaining unthreaded shank strength
Professional Applications & Engineering Value
This Grade 5 steel hex head screw with 3/4"-16 UNF fine threading addresses critical engineering challenges in heavy machinery, structural assemblies, and industrial equipment. The zinc plated finish combats corrosion in demanding environments, while the 120,000 psi tensile strength and Rockwell C25 hardness ensure structural integrity under high stress conditions. The external hex drive design facilitates quick installation and removal with standard wrenches, reducing assembly time in manufacturing and maintenance operations. The partially threaded configuration provides optimal clamping force distribution, making it ideal for applications requiring precise load management and vibration resistance in construction, automotive, and industrial machinery sectors.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNF fine thread specifications (3/4"-16). Complies with ASME B18.2.1 and SAE J429 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features inch system measurements with 2 3/4" overall length and 1 3/4" minimum thread length for consistent performance across industrial applications.
