S-91286A407 5/8"-11 x 2 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 load-bearing capacity with Grade 8 classification and 150,000 psi tensile strength for reliable performance in high-stress environments
- Superior corrosion protection through zinc-flake coating, extending service life in harsh industrial conditions
- Optimized torque transmission with external hex drive design ensuring secure installation and removal
- Precision thread engagement with Class 2A UNC coarse threads providing vibration resistance and quick assembly
- Enhanced durability from Rockwell C33 hardness, maintaining structural integrity under repeated stress
- Versatile partial threading allowing both clamping and alignment functions in structural applications
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for global industrial use
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 corrosion resistance in challenging environments from manufacturing facilities to outdoor equipment. The 5/8"-11 UNC coarse thread design ensures rapid assembly while maintaining vibration resistance, significantly reducing installation time in production lines. With partial threading and external hex drive, these fasteners offer superior clamping force distribution and easy maintenance access. Ideal for structural steel connections, heavy machinery assembly, and construction applications requiring 150,000 psi tensile strength and reliable long-term performance under dynamic loads.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNC thread type specifications. Complies with ASME B18.2.1 and SAE J429 Grade 8 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features right-hand thread direction with coarse thread spacing and minimum 1 1/2" thread length on a 2 3/4" overall length configuration.
