S-91286A339 1/2"-13 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 heavy loads and vibration.
- Coarse UNC threads offer faster installation and better grip in soft materials or where frequent disassembly is required.
- Partially threaded design allows for precise clamping force control and secure fastening in specific assembly setups.
- External hex drive enables easy installation and removal with standard tools, improving workflow efficiency.
- Compliance with industry standards (ASME B18.2.1, SAE J429) guarantees consistent quality and interoperability in professional applications.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and corrosion resistance are paramount. The steel material combined with zinc-flake coating provides long-term protection against rust and chemical exposure, reducing downtime in corrosive environments. With its coarse UNC thread and partial threading, it ensures secure fastening in dynamic load conditions, preventing loosening under vibration. Ideal for structural frames, engine components, and industrial equipment, this heavy-duty hex bolt delivers reliable performance, meeting the rigorous demands of B2B industrial applications while maintaining compliance with global standards.
Specification Summary & Compliance
This fastener features Class 2A thread fit for consistent engagement and ease of assembly, adhering to UNC coarse thread standards. It complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence in industrial markets.
