S-91247A608 5/16"-18 x 6 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 (120,000 psi) ensures reliable performance in demanding applications, reducing the risk of fastener failure.
- Zinc plating provides excellent corrosion resistance, extending service life in harsh industrial environments.
- Grade 5 classification and Rockwell C25 hardness guarantee consistent mechanical properties and durability under high stress.
- Coarse UNC thread and Class 2A fit enable quick assembly and secure fastening, even in materials prone to stripping.
- Partially threaded shank design allows for precise clamping force distribution, ideal for joint integrity.
- External hex drive and standard hex head facilitate easy installation and removal with common tools, improving workflow efficiency.
- Compliance with ASME B18.2.1/SAE J429 standards ensures dimensional accuracy and interchangeability for professional use.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered from zinc plated steel to address common industrial challenges such as vibration loosening and environmental degradation. Its 5/16"-18 UNC coarse thread and Class 2A thread fit provide robust holding power in structural assemblies, machinery, and heavy equipment, where high tensile strength (120,000 psi) and Rockwell C25 hardness prevent deformation under load. The partially threaded design concentrates stress effectively, reducing the risk of shear in dynamic applications. Ideal for construction, automotive, and manufacturing sectors, this fastener ensures long-term reliability and compliance with rigorous industry standards, making it a trusted choice for engineers seeking durable industrial fastening solutions.
Specification Summary & Compliance
This screw features a 6 1/2" length with a min thread length of 1 1/8", Class 2A thread fit for precise tolerance, and UNC coarse threading per inch system standards. It meets ASME B18.2.1 and SAE J429 specifications for dimensional consistency and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
