S-91286A222 3/8"-16 x 3 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 rated at 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance with zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness (Rockwell C33) provides excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threading offers faster installation and better debris clearance, improving assembly efficiency.
- Partially threaded design allows for precise clamping force control, ideal for applications requiring specific grip lengths.
- External hex drive enables high-torque installation with standard tools, ensuring secure fastening in heavy-duty setups.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability for industrial projects.
Professional Applications & Engineering Value
Engineered for demanding environments, these Grade 8 hex head screws deliver robust performance in construction, machinery assembly, and automotive applications. The steel material combined with zinc-flake coating effectively combats corrosion, addressing common issues like rust-induced weakening in outdoor or high-moisture settings. With a 3/8"-16 UNC coarse thread and partial threading, they provide superior grip and vibration resistance, preventing loosening under dynamic loads. The external hex drive facilitates quick, high-torque installations, reducing labor time while ensuring secure connections. Ideal for structural frames and heavy equipment, these screws meet rigorous industrial standards, offering reliability that minimizes downtime and maintenance costs.
Specification Summary & Compliance
This fastener adheres to precise dimensional tolerances, including Class 2A thread fit for consistent engagement and UNC coarse threading per inch system requirements. It conforms to ASME B18.2.1 and SAE J429 specifications for Grade 8 strength, ensuring mechanical integrity. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental and safety regulations in global supply chains.
