S-91286A283 7/16"-14 x 3 1/2" 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 industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the zinc-flake coating extends service life in harsh environments, minimizing maintenance and replacement costs.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under repetitive loading conditions.
- Coarse UNC threading with Class 2A fit allows for faster installation and better vibration resistance in construction and heavy machinery.
- Partially threaded design offers optimal clamping force control, ideal for applications requiring precise joint security.
- External hex drive enables easy installation with standard tools, reducing assembly time and labor costs.
- Compliance with major standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interoperability in professional applications.
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these Grade 8 hex head screws solve critical fastening challenges where vibration, heavy loads, and corrosive elements are concerns. The zinc-flake coated steel construction provides a robust barrier against rust and chemical exposure, making them ideal for construction equipment, machinery assembly, and structural applications. The 7/16"-14 UNC coarse thread configuration ensures quick engagement and superior holding power in both soft and hard materials, while the partial threading design prevents over-tightening and distributes stress evenly. These heavy-duty fasteners deliver reliable performance in automotive, manufacturing, and infrastructure projects where failure is not an option.
Specification Summary & Compliance
This 3 1/2" length hex head screw features precise Class 2A thread fit tolerances and complies with ASME B18.2.1 and SAE J429 manufacturing specifications. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring safe use across regulated industries.
