S-91247A241 3/8"-24 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
- Superior tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Zinc plating provides excellent corrosion resistance, extending service life in harsh or outdoor environments.
- Partially threaded design offers optimal clamping force and vibration resistance where full threading isn't required.
- Grade 5 classification and Rockwell C25 hardness guarantee consistent durability and mechanical reliability.
- UNF fine threading with Class 2A fit ensures precise engagement and secure fastening in fine-thread applications.
- External hex drive and hex head allow for easy installation and high torque application with standard tools.
- Compliance with ASME B18.2.1 and SAE J429 assures adherence to industry standards for dimensional accuracy and performance.
Professional Applications & Engineering Value
This 3/8"-24 UNF hex head screw is engineered for demanding industrial and construction applications where strength and reliability are critical. The zinc plated steel construction provides a protective barrier against corrosion, making it suitable for outdoor machinery, structural assemblies, and automotive components. The partially threaded design allows the unthreaded shank to bear shear loads effectively, while the threaded portion ensures secure fastening. With a fine UNF thread and Class 2A fit, it delivers precise alignment and resistance to loosening under vibration. Ideal for heavy-duty fastening in equipment manufacturing, infrastructure projects, and mechanical systems, this screw combines high tensile strength with compliance to key standards, ensuring long-term performance and safety.
Specification Summary & Compliance
This hex head screw features a 3/8"-24 UNF fine thread with Class 2A thread fit for dimensional accuracy. It is manufactured from steel with a zinc plated finish and meets ASME B18.2.1 and SAE J429 specifications for Grade 5 fasteners. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence.
