S-91247A034 1/4"-28 x 6" 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 tensile strength of 120,000 psi ensures reliable performance in high-stress industrial applications
- Superior corrosion resistance with zinc plating that protects against environmental degradation
- Precision Class 2A thread fit guarantees smooth installation and secure fastening in demanding conditions
- Grade 5 strength classification provides optimal balance of durability and cost-effectiveness for heavy-duty use
- Rockwell C25 hardness rating maintains structural integrity under repeated loading and vibration
- Fine UNF threading offers superior resistance to loosening compared to coarse thread alternatives
- Partial threading design allows for precise clamping force control in varied material thicknesses
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 5 hex head screws deliver exceptional performance in construction, machinery assembly, and heavy equipment manufacturing. The zinc plated steel construction provides reliable corrosion protection in challenging environments, while the 1/4"-28 UNF fine threading ensures superior vibration resistance and clamping force retention. The external hex drive design allows for high-torque installation with standard tools, making them ideal for applications requiring 120,000 psi tensile strength and consistent performance under dynamic loads. The partially threaded configuration enables precise engagement in structural assemblies where shear strength and joint integrity are critical.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications with Class 2A thread fit precision. These inch system fasteners feature 1/4"-28 UNF fine threads with 3/4" minimum thread length on a 6" overall length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
