S-91257A793 9/16"-12 x 8" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

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 from zinc yellow-chromate plating extends service life in harsh or outdoor environments, minimizing maintenance needs.
• High hardness rating (Rockwell C33) provides excellent wear resistance, maintaining thread integrity through repeated use.
• Coarse UNC threading with Class 2A fit allows for quicker installation and better performance in materials prone to debris or vibration.
• Partially threaded design offers optimal clamping force distribution, ideal for applications requiring precise joint security.
• External hex drive enables easy installation with standard tools, improving assembly efficiency in industrial settings.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability in regulated industries.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial applications where vibration, high loads, and environmental exposure are common. The steel construction combined with zinc yellow-chromate plating provides a robust barrier against corrosion, making it suitable for construction, machinery assembly, and infrastructure projects. The coarse UNC thread ensures secure fastening in softer materials or conditions where fine threads might clog, while the partial threading design concentrates clamping force where it's needed most. By meeting ASME B18.2.1 and SAE J429 specifications, this fastener delivers predictable performance and reliability, reducing downtime and maintenance costs in demanding operational environments.

Specification Summary & Compliance

This 9/16"-12 UNC hex head screw features a Class 2A thread fit for consistent engagement and ease of assembly. Manufactured to comply with ASME B18.2.1 and SAE J429 standards, it ensures dimensional accuracy and mechanical properties suitable for industrial use. The inch system measurements and coarse thread spacing provide compatibility with standard components, while the specified material and finish adhere to common industry regulations for performance and safety.