Fractional Size Grade 8 Fastener
Fractional Size Grade 8 Hex Head Cap Screws for Extreme-Duty Fastening
Fractional Size Grade 8 Hex Head Cap Screws are engineered for maximum strength, durability, and reliability in the most demanding applications. As the highest-strength option in standard carbon steel fasteners, Grade 8 cap screws are trusted in environments where extreme loads, shock, and vibration are present and fastener failure is not an option.
Maximum Strength Through Heat-Treated Alloy Steel
Manufactured from heat-treated medium carbon alloy steel, Grade 8 hex head cap screws deliver exceptional mechanical performance. With a minimum tensile strength of 150,000 psi and a yield strength of 130,000 psi, these fasteners are designed to handle severe stress and maintain clamping force under heavy loads. This superior strength makes them ideal for critical assemblies such as automotive suspension systems, heavy equipment, agricultural machinery, and high-load structural connections.
Precision Design for Secure Installation
The six-sided hex head design allows for accurate torque application using standard wrenches or sockets, ensuring consistent and secure tightening. Grade 8 fasteners are easily identified by six radial lines on the head, providing quick visual confirmation of strength class during installation and maintenance. Fine-thread options are also available, offering increased clamping force and resistance to loosening in vibration-intensive applications.
Fractional Sizing and Industry Compliance
Available in standard fractional (inch) sizes, Grade 8 hex head cap screws are compatible with U.S. hardware systems and a wide range of industrial equipment. They conform to ASME B18.2.1 dimensional standards and meet SAE J429 mechanical property requirements, ensuring precise thread engagement, consistent fit, and dependable performance across applications.
Finishes and Application Versatility
Grade 8 cap screws are commonly offered with zinc or phosphate coatings to provide corrosion resistance and extended service life. These finishes protect against rust and wear in industrial and outdoor environments while maintaining the fastener’s strength and integrity.
Key Benefits of Grade 8 Hex Head Cap Screws
150,000 psi tensile and 130,000 psi yield strength
Heat-treated alloy steel construction
Designed for extreme loads and high-stress conditions
Fractional sizing for U.S. standard applications
Ideal for automotive, heavy equipment, and industrial use
For applications that demand uncompromising strength and long-term reliability, Fractional Size Grade 8 Hex Head Cap Screws deliver performance professionals can trust.