S-91247A594 5/16"-18 x 2 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 high-stress industrial applications, reducing the risk of fastener failure.
- Zinc plating provides superior corrosion resistance, extending service life and maintaining integrity in harsh environments.
- Grade 5 steel construction with Rockwell C25 hardness offers excellent durability and wear resistance for long-term use.
- Partially threaded design with UNC coarse threads allows for secure fastening and easier alignment in assembly operations.
- Class 2A thread fit ensures consistent, precise engagement, minimizing cross-threading and improving installation efficiency.
- External hex drive and standard head dimensions enable quick installation and removal with common tools, saving time on the job site.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees quality and interoperability in regulated industrial settings.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address common challenges in heavy-duty assembly, such as vibration loosening and environmental degradation. The steel material and zinc plating work together to resist corrosion and mechanical wear, making it ideal for construction, machinery, and automotive applications where coarse UNC threads provide quick, secure fastening even in materials with variable density. The partially threaded configuration ensures that the unthreaded shank bears shear loads effectively, while the threaded portion maintains clamp force, reducing the need for frequent maintenance and replacements in demanding industrial environments.
Specification Summary & Compliance
This fastener adheres to precise dimensional standards, including a Class 2A thread fit for consistent tolerance and UNC coarse threading with a size of 5/16"-18. It meets ASME B18.2.1 and SAE J429 specifications for quality assurance, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.
