S-91286A477 3/4"-10 x 5 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 applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness rating (Rockwell C33) provides excellent wear resistance, maintaining structural integrity under repeated loads.
- Coarse UNC threading allows for quicker installation and better grip in softer materials, saving assembly time.
- Partial threading design offers optimal clamp load distribution, preventing joint loosening in dynamic applications.
- External hex drive enables easy tightening with standard tools, facilitating efficient maintenance and disassembly.
- Grade 8 certification guarantees consistent quality and reliability for critical heavy-duty fastening requirements.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, this Grade 8 hex head screw combines high-strength steel construction with a durable zinc-flake coating to combat corrosion in outdoor or chemically exposed environments. The 3/4"-10 UNC coarse thread ensures secure fastening in structural assemblies, machinery, and transportation equipment, where vibration resistance is critical. Its partial threading concentrates clamping force near the joint, reducing stress concentration and enhancing fatigue life. Ideal for construction, automotive, and heavy machinery applications, this fastener addresses common challenges like galvanic corrosion, thread stripping, and load cycling, providing long-term reliability and compliance with industry standards.
Specification Summary & Compliance
This fastener meets Class 2A thread fit tolerances for consistent engagement and is manufactured in accordance with ASME B18.2.1 and SAE J429 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries. The 5 1/2" length and partial UNC threading provide precise dimensional accuracy for reliable performance in standardized assemblies.
