S-91247A347 7/16"-20 x 8" 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 from the zinc plating extends service life in harsh or outdoor industrial environments.
- Rockwell C25 hardness provides excellent durability and wear resistance, maintaining integrity under repeated use.
- Class 2A thread fit with UNF fine threading offers precise, secure fastening and reduced likelihood of cross-threading during installation.
- Partial threading design allows for controlled clamping force, ideal for applications requiring specific grip lengths.
- External hex drive and hex head enable easy installation and high torque application with standard tools, speeding up assembly.
- Compliance with ASME, SAE, RoHS, and REACH standards ensures quality, safety, and environmental responsibility for global supply chains.
Professional Applications & Engineering Value
This Grade 5 steel hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, structural frameworks, and automotive components. The UNF fine thread and Class 2A thread fit provide superior vibration resistance and precise engagement, minimizing loosening in dynamic environments. Made from high-strength steel with a zinc plated finish, it combats corrosion effectively, extending maintenance intervals in exposed conditions. The partial threading allows for optimal load distribution, making it suitable for applications where unthreaded shank sections enhance shear strength. Ideal for construction, manufacturing, and equipment repair, this fastener delivers reliability that reduces downtime and ensures long-term operational safety.
Specification Summary & Compliance
This hex head screw features a 7/16"-20 UNF fine thread with Class 2A thread fit for consistent dimensional accuracy. It meets ASME B18.2.1 and SAE J429 specifications, ensuring adherence to recognized engineering standards. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free from hazardous substances and suitable for regulated industrial markets.
