S-91247A014 1/4"-28 x 1 3/4" 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
- Exceptional tensile strength of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
- Superior corrosion resistance provided by zinc plating extends the screw's service life in harsh environments.
- High hardness rating (Rockwell C25) offers excellent wear resistance and durability under heavy loads.
- Precise UNF fine threading with Class 2A fit allows for smoother assembly and secure, vibration-resistant connections.
- Partially threaded design provides optimal clamping force and prevents loosening in dynamic applications.
- External hex drive enables easy installation and high torque application with standard tools.
- Compliance with industry standards (ASME B18.2.1, SAE J429) guarantees consistent quality and interchangeability.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 5 hex head screw combines high-strength steel with a zinc-plated finish to withstand extreme mechanical stress and resist corrosion. The UNF fine thread design ensures superior holding power in materials prone to vibration, such as machinery, automotive assemblies, and structural frameworks. Its partially threaded shank concentrates clamping force precisely where needed, preventing joint failure. With a 1/4"-28 thread size and 1 3/4" length, it offers versatility for various inch fastening systems, providing engineers with a reliable solution that meets rigorous performance and regulatory requirements.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit tolerances and UNF fine thread standards, ensuring precise engagement. It conforms to ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
