S-91257A182 5/8"-11 x 12" 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 provided by zinc yellow-chromate plating extends service life in harsh or outdoor environments.
- High hardness rating (Rockwell C33) enhances wear resistance and maintains structural integrity under repeated loads.
- Precision Class 2A thread fit allows for easy assembly while maintaining secure fastening, minimizing installation time and errors.
- Partially threaded design offers optimal grip and clamping force for heavy-duty connections without unnecessary thread engagement.
- External hex drive and hex head enable straightforward installation with common tools, improving efficiency in industrial settings.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability in regulated applications.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in demanding sectors such as construction, machinery assembly, and infrastructure projects. Its steel construction and 150,000 PSI tensile strength provide the durability needed to withstand extreme vibrations and dynamic loads, preventing joint loosening. The zinc yellow-chromate plating offers robust protection against corrosion, making it ideal for outdoor or humid conditions. With a coarse UNC thread and partial threading, it ensures quick installation and reliable clamping in heavy-duty frames, equipment bases, and structural supports, reducing maintenance downtime and enhancing operational safety.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances for consistent engagement and meets ASME B18.2.1 and SAE J429 specifications. It features a 5/8"-11 UNC coarse thread with a minimum thread length of 1 3/4" and is manufactured from high-strength steel. The product complies with industry standards for dimensional accuracy and performance, ensuring reliability in professional applications.
