S-91247A042 1/4"-28 x 7 1/2" 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 applications, reducing the risk of fastener failure.
- Superior corrosion resistance with zinc plating extends service life in harsh industrial environments, minimizing maintenance needs.
- Fine UNF threading provides improved vibration resistance and secure fastening compared to coarse threads.
- Grade 5 steel construction with Rockwell C25 hardness offers excellent durability and wear resistance for long-term use.
- External hex drive design allows for easy installation and removal with standard tools, saving time during assembly.
- Class 2A thread fit ensures consistent, precise engagement with mating components for reliable connections.
- Partial threading provides unthreaded shank areas for enhanced shear strength in specific mounting scenarios.
Professional Applications & Engineering Value
This 1/4"-28 UNF hex head screw delivers critical engineering value through its Grade 5 steel composition and optimized design. The fine UNF threading maintains secure connections in vibration-prone equipment, while the zinc plating protects against corrosion in outdoor or humid industrial settings. The 7 1/2" length with partial threading makes it ideal for applications requiring both clamping force and shear resistance, such as heavy machinery assembly, structural frameworks, and automotive components. Its external hex drive facilitates quick installation in confined spaces, addressing common assembly challenges in manufacturing and maintenance operations.
Specification Summary & Compliance
This hex head screw features 1/4"-28 UNF fine threading with Class 2A thread fit tolerance for precise engagement. Manufactured to ASME B18.2.1 and SAE J429 specifications, it ensures dimensional accuracy and performance reliability. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict material safety standards.
