S-91286A328 1/2"-13 x 2 3/8" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 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 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness (Rockwell C33) provides excellent wear resistance, maintaining thread integrity during repeated use.
- Coarse UNC threading allows for quick installation and secure gripping in a variety of materials, improving assembly efficiency.
- Class 2A thread fit ensures consistent, precise engagement with nuts and tapped holes, reducing the chance of cross-threading.
- External hex drive design offers easy access for standard tools, enabling straightforward tightening in confined spaces.
- Partial threading provides an unthreaded shank for enhanced shear strength, ideal for applications requiring precise clamp load.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in machinery, construction, and automotive assemblies where vibration and dynamic loads are common. The zinc-flake coated steel construction combats corrosion in outdoor or chemically aggressive settings, while the 1/2"-13 UNC coarse thread ensures rapid installation and robust holding power in both metal and composite materials. With a partially threaded design, it concentrates clamping force effectively, preventing joint loosening and enhancing structural integrity. These screws are indispensable for projects demanding high tensile strength and long-term reliability, supporting efficient maintenance and reduced downtime in B2B operations.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances per UNC standards, ensuring dimensional accuracy for consistent performance. It meets ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners, guaranteeing manufacturing quality. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental and safety standards, making it suitable for global industrial supply chains.
