S-91247A039 1/4"-28 x 7" 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 capability with Grade 5 steel construction and 120,000 psi tensile strength for demanding industrial applications
- Enhanced corrosion resistance through zinc plating, extending service life in harsh environments
- Precise thread engagement with UNF fine threading and Class 2A fit ensuring reliable fastening performance
- Optimized torque transmission via external hex drive design with 7/16" head width for secure installation
- Reduced material stress through Rockwell C25 hardness balance between strength and ductility
- Versatile partial threading allowing both clamping and alignment functions in 7" length applications
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interoperability
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 5 steel hex head screws deliver exceptional performance in construction equipment, machinery assembly, and structural frameworks. The UNF fine threading provides superior resistance to vibration loosening compared to coarse threads, while the zinc plating creates a sacrificial barrier against oxidation in moderate corrosive environments. The partially threaded design allows the unthreaded shank section to bear shear loads efficiently, making these 7-inch fasteners ideal for applications requiring both clamping force and precise component alignment. The external hex drive facilitates high-torque installation with standard tools, ensuring reliable connections in industrial maintenance and manufacturing operations where 120,000 psi tensile strength is critical for structural integrity.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 5 standards with Class 2A thread fit precision. Features 1/4"-28 UNF fine threads with right-hand direction and minimum 1" thread length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include Rockwell C25 hardness and 120,000 psi tensile strength for consistent performance in inch-system applications.
