S-91247A322 7/16"-20 x 2 1/4" 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
- Superior tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Enhanced corrosion resistance from zinc plating prolongs service life in harsh industrial environments, minimizing maintenance needs.
- Fine UNF threading (7/16"-20) provides improved vibration resistance and secure fastening in precision assemblies.
- Class 2A thread fit guarantees consistent, easy installation while maintaining tight tolerances for repeatable results.
- Partially threaded design allows for precise clamping force control, ideal for components requiring specific grip ranges.
- Rockwell C25 hardness offers excellent durability and wear resistance, extending the fastener's lifecycle under dynamic loads.
- External hex drive enables quick installation with standard tools, boosting assembly efficiency in production lines.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical challenges in heavy-duty machinery, automotive systems, and structural frameworks. Its zinc-plated steel construction combats corrosion in humid or outdoor settings, while the UNF fine thread enhances grip in materials prone to stress cracking. The partially threaded shank concentrates clamping force where needed, preventing joint loosening under vibration—common in engine mounts or conveyor systems. With a 2 1/4" length and external hex drive, it simplifies maintenance in tight spaces, reducing downtime. Ideal for industrial fasteners requiring ASME B18.2.1 compliance, this screw delivers predictable performance in load-bearing assemblies, from construction equipment to manufacturing jigs.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit per UNF standards, ensuring precise dimensional accuracy. It meets ASME B18.2.1 and SAE J429 specifications for Grade 5 hex head screws, with verified tensile strength and hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free of restricted substances, supporting global supply chain requirements.
