S-91286A162 5/16"-18 x 1 3/4" 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 under extreme loads, reducing the risk of fastener failure in critical applications.
- Superior corrosion resistance with zinc-flake coating prolongs service life in harsh industrial environments, minimizing maintenance and replacement costs.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability, maintaining thread integrity through repeated use.
- Precision Class 2A thread fit with UNC coarse threading enables faster installation and secure fastening in various materials.
- Partially threaded design allows for controlled clamping force distribution, ideal for applications requiring specific grip lengths.
- External hex drive configuration offers superior torque transmission and easy installation with standard tools.
- Full compliance with industry standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interchangeability.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The zinc-flake coated steel construction provides exceptional protection against corrosion in demanding environments such as manufacturing equipment, structural assemblies, and automotive systems. The 5/16"-18 UNC coarse thread design ensures rapid installation and secure fastening in both soft and hard materials, while the partially threaded configuration allows precise load distribution. With 150,000 PSI tensile strength and Rockwell C33 hardness, these fasteners withstand vibration, shock loads, and extreme pressure conditions, making them ideal for machinery, construction, and transportation applications where reliability is paramount.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with Class 2A thread fit tolerance for consistent performance. Complies with ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features UNC coarse threads with partial threading and external hex drive configuration per industry standards.
