S-91286A321 1/2"-13 x 1 5/8" 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 load-bearing capacity with 150,000 PSI tensile strength for reliable performance in demanding applications
- Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh industrial environments
- High-strength Grade 8 classification ensures consistent performance under extreme pressure and vibration
- Optimized installation efficiency through external hex drive design and coarse UNC threads for faster assembly
- Precise thread engagement with Class 2A fit maintains secure fastening while allowing for easy installation
- Enhanced durability from Rockwell C33 hardness rating, resisting wear and deformation under heavy loads
- Full regulatory compliance meeting ASME, SAE, RoHS 3, and REACH standards for global industrial applications
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The 1/2"-13 UNC coarse threads provide superior grip in various materials while the external hex drive enables high-torque installation without stripping. The zinc-flake coating offers outstanding corrosion protection, making these steel fasteners ideal for construction equipment, machinery assembly, and structural applications exposed to harsh conditions. With fully threaded design and right-hand threading, these screws ensure maximum engagement strength and simplified installation processes for maintenance crews and production lines alike.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading standards. These hex head screws comply with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use across global markets. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness provides verified performance metrics for engineering specifications.
