S-91257A890 3/4"-16 x 9" 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 150,000 psi tensile strength for reliable performance in high-stress applications.
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments.
- Optimized for high-torque assembly thanks to the external hex drive and 1 1/8" head width, ensuring secure installation.
- Enhanced fatigue resistance from Rockwell C33 hardness, maintaining structural integrity under dynamic loads.
- Precise thread engagement with UNF fine threads and Class 2A fit, reducing the risk of cross-threading and loosening.
- Versatile partial threading allows for both clamping and alignment functions, ideal for varied industrial setups.
- Full regulatory compliance including RoHS 3 and REACH, ensuring safe and sustainable use in global markets.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in machinery, construction, and automotive sectors where high tensile strength and corrosion resistance are paramount. The 3/4"-16 UNF fine thread design ensures tight, secure fastening in components subjected to vibration and dynamic stresses, while the zinc yellow-chromate plating provides a durable barrier against moisture and chemicals. Its partially threaded configuration offers flexibility for applications requiring both shear strength and adjustability, making it a reliable choice for structural assemblies and equipment manufacturing. Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability in professional environments.
Specification Summary & Compliance
This fastener features a 3/4"-16 UNF fine thread with Class 2A fit for precise dimensional accuracy, manufactured to 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 sustainability.
