S-91257A886 3/4"-16 x 7 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
- Superior tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Exceptional corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments.
- Precise Class 2A thread fit with UNF fine threading provides secure, vibration-resistant connections for critical assemblies.
- Grade 8 hardness (Rockwell C33) delivers outstanding durability and wear resistance under heavy loads.
- External hex drive design allows for easy installation and removal with standard tools, improving maintenance efficiency.
- Partial threading offers optimal grip length control, preventing over-tightening and material damage.
- Compliance with ASME B18.2.1 and SAE J429 ensures consistent quality and interchangeability in professional applications.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors where high tensile strength and corrosion resistance are paramount. The 3/4"-16 UNF fine thread configuration provides superior clamping force and vibration resistance, making it ideal for dynamic load applications. Constructed from zinc yellow-chromate plated steel, it combats rust and chemical exposure in outdoor or industrial settings. The partial threading design prevents thread galling while maintaining structural integrity, and the external hex drive ensures compatibility with standard wrenching tools for efficient assembly and disassembly in maintenance operations.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit per UNF standards with precise dimensional accuracy. Manufacturing follows ASME B18.2.1 and SAE J429 specifications for Grade 8 requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence.
