S-91286A155 5/16"-18 x 1" 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 Grade 8 classification and 150,000 psi tensile strength for reliable performance in high-stress applications.
- Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh industrial environments.
- High hardness rating of Rockwell C33 ensures excellent wear resistance and reduced thread deformation during installation.
- Precision threading with UNC coarse thread pattern and Class 2A fit enables quick assembly and secure fastening.
- Optimal torque transmission through external hex drive design, allowing for high tightening forces without slippage.
- Full thread coverage along the 1" length provides maximum grip and uniform stress distribution.
- Regulatory compliance with ASME, SAE, RoHS 3, and REACH standards ensures material safety and interchangeability.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers critical reliability where failure is not an option. The steel construction with Rockwell C33 hardness withstands vibrational stresses and dynamic loads in machinery, construction, and automotive assemblies. Its UNC coarse threads provide superior resistance to loosening in high-vibration environments, while the zinc-flake coating offers exceptional protection against corrosion in outdoor or chemically aggressive settings. The external hex drive enables high-torque installation with standard tools, making it ideal for maintenance operations and production lines requiring efficient fastening solutions with 150,000 psi tensile strength.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit tolerances according to UNC thread standards, ensuring precise interchangeability. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental and safety regulations for industrial components.
