S-91286A209 3/8"-16 x 2 1/4" 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 capability with 150,000 psi tensile strength, ideal for high-stress industrial assemblies.
- Superior corrosion resistance from zinc-flake coating, extending service life in harsh environments.
- Reliable thread engagement with Class 2A fit and coarse UNC threads, ensuring easy installation and vibration resistance.
- High durability backed by Rockwell C33 hardness, reducing wear and deformation under heavy loads.
- Secure fastening with external hex drive, allowing high torque application without stripping.
- Optimized for partial threading, providing unthreaded shank for precise clamping in structured applications.
- Full compliance with industry standards, including ASME B18.2.1 and SAE J429, guaranteeing interchangeability and safety.
Professional Applications & Engineering Value
Engineered for heavy-duty applications, this Grade 8 hex head screw addresses critical challenges in construction, machinery, and structural frameworks where failure is not an option. The 3/8"-16 UNC coarse thread design ensures rapid assembly and superior resistance to loosening under dynamic loads, while the zinc-flake coated steel provides a robust barrier against rust and chemical exposure. Its partially threaded configuration allows the unthreaded portion to act as a precision dowel, minimizing shear stress and maintaining alignment in bolted joints. By integrating high tensile strength and external hex drive compatibility, it streamlines maintenance and upgrades in demanding environments like industrial equipment and infrastructure projects.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit for consistent engagement and meets ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are upheld.
