S-91286A415 5/8"-11 x 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 tensile strength of 150,000 psi ensures reliable performance in high-stress industrial applications, reducing failure risks.
- Superior corrosion resistance from zinc-flake coating extends service life in harsh environments, minimizing maintenance needs.
- High hardness rating (Rockwell C33) provides excellent wear resistance, maintaining structural integrity under repeated loads.
- Precise Class 2A thread fit with UNC coarse threads enables quick assembly and secure fastening, improving installation efficiency.
- Partially threaded design allows for optimal clamping force distribution, enhancing joint stability in heavy machinery.
- External hex drive compatibility with standard tools simplifies tightening and removal, reducing labor time and costs.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability in professional settings.
Professional Applications & Engineering Value
Engineered for demanding industrial environments, this Grade 8 hex head screw combines high-strength steel material with a durable zinc-flake coating to address common challenges like vibration loosening and corrosion in machinery assembly. The 5/8"-11 UNC coarse thread and partial threading ensure rapid installation and reliable grip in structural frameworks, automotive components, and heavy equipment. By meeting rigorous standards, it provides a trusted solution for B2B procurement where tensile strength and long-term durability are critical, reducing downtime and replacement costs in sectors like construction and manufacturing.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances and UNC coarse thread standards, manufactured under ASME B18.2.1 and SAE J429 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for global industrial use.
