S-91268A350 1/4"-20 x 2 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 of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- High hardness rating (Rockwell C33) provides superior resistance to wear and deformation, extending service life in demanding environments.
- Fully threaded UNC coarse design offers faster installation and enhanced grip in a wide range of materials, improving assembly efficiency.
- Class 2A thread fit guarantees consistent, precise engagement with nuts and tapped holes, minimizing cross-threading and rework.
- External hex drive and hex head allow for high-torque application with standard tools, ensuring secure fastening in tight spaces.
- Compliance with ASME B18.2.1 and SAE J429 ensures dimensional accuracy and interchangeability, supporting quality control in regulated industries.
- RoHS 3 and REACH compliance confirms environmental and safety standards are met, making it suitable for global supply chains.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in machinery, construction, and automotive assemblies where vibration and dynamic loads are common. The steel material and fully threaded 1/4-20 UNC coarse thread design provide superior clamping force and resistance to loosening, reducing maintenance needs. With an external hex drive, it enables efficient installation using common wrenches, saving time in high-volume production. The combination of high tensile strength and Rockwell C33 hardness ensures durability under extreme conditions, making it a reliable choice for structural fastening that demands long-term performance and safety.
Specification Summary & Compliance
This fastener features a 1/4"-20 UNC coarse thread with Class 2A thread fit for precise dimensional tolerance, ensuring compatibility with standard components. It meets ASME B18.2.1 and SAE J429 specifications for consistent quality and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible manufacturing practices.
