S-91247A033 1/4"-28 x 5 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 under heavy loads, reducing the risk of fastener failure in critical applications.
- Superior corrosion resistance with zinc plating protects against rust and environmental damage, extending service life in harsh industrial conditions.
- Precise Class 2A thread fit and UNF fine threading provide secure, vibration-resistant connections, minimizing loosening in dynamic environments.
- Grade 5 strength classification and Rockwell C25 hardness offer excellent durability and wear resistance for long-term structural integrity.
- External hex drive design allows for easy installation and high torque application with standard tools, improving assembly efficiency.
- Partial threading enables optimal clamping force distribution, ideal for applications requiring both gripping strength and adjustability.
- Compliance with ASME B18.2.1 and SAE J429 ensures consistent quality and interchangeability, meeting rigorous industrial standards.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion degradation. The zinc plated steel construction provides a protective barrier against moisture and chemicals, making it suitable for outdoor machinery, structural frameworks, and automotive assemblies. The UNF fine thread and Class 2A fit deliver superior holding power in high-stress environments, while the external hex drive facilitates quick installation in confined spaces. Ideal for construction, heavy equipment, and manufacturing sectors, this screw ensures reliable fastening where safety and durability are paramount.
Specification Summary & Compliance
This screw adheres to Class 2A thread tolerance and UNF fine thread standards, manufactured in compliance with ASME B18.2.1 and SAE J429 specifications. It is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for global industrial use.
