S-91286A185 5/16"-24 x 1 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 tensile strength of 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.
- Precision Class 2A thread fit guarantees smooth installation and secure fastening, improving assembly efficiency.
- High hardness (Rockwell C33) provides excellent wear resistance, maintaining thread integrity under repeated use.
- Fully threaded UNF fine design offers enhanced grip and vibration resistance, ideal for dynamic load conditions.
- Compliance with ASME B18.2.1 and SAE J429 standards ensures consistent quality and interoperability in mechanical systems.
- RoHS 3 and REACH compliance supports environmental safety and regulatory adherence in global supply chains.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, automotive components, and structural frameworks. The steel construction combined with a zinc-flake coating provides robust protection against corrosion and chemical exposure, extending fastener lifespan in demanding environments. The 5/16"-24 UNF fine thread with a Class 2A fit ensures precise engagement and resistance to loosening under vibration, reducing downtime for adjustments. By meeting ASME B18.2.1 and SAE J429 specifications, it delivers reliable performance in applications requiring high tensile strength and durability, making it a trusted choice for engineers and procurement specialists seeking long-term reliability.
Specification Summary & Compliance
This fastener features a 5/16"-24 UNF fine thread with Class 2A tolerance for accurate fit, and is fully threaded for consistent holding power. It complies with ASME B18.2.1 and SAE J429 manufacturing standards, ensuring dimensional precision and mechanical reliability. Additionally, it is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, supporting environmental and safety regulations in industrial use.
