1/4"-20x1" Grade 8 Hex Head Cap Screw

Hex Head Cap Screw Grade 8 for Extreme-Duty Fastening

Hex Head Cap Screw Grade 8 fasteners are engineered to deliver maximum strength, durability, and reliability in the most demanding applications. Designed for high-stress environments, these premium fasteners are the preferred choice for professionals who require superior load capacity and consistent performance in critical assemblies.

Superior Mechanical Strength and Performance

Grade 8 hex head cap screws are manufactured from high-strength carbon alloy steel and heat-treated to achieve exceptional mechanical properties. With a proof load strength of 120,000 psi and a minimum tensile strength of 150,000 psi, these fasteners are built to withstand extreme loads, shock, and vibration. A Rockwell hardness range of C33 to C39 ensures optimal resistance to wear and deformation under severe conditions.

Clear Identification and Precision Manufacturing

Grade 8 fasteners are easily identified by six radial lines spaced 60 degrees apart on the head, allowing for quick verification during installation and inspection. Each hex head cap screw is precision manufactured to comply with ASME B18.2.1 dimensional standards, ensuring consistent fit, accurate threading, and reliable torque application across all sizes.

Zinc Yellow Cr6 Plating for Corrosion Resistance

These Grade 8 hex head cap screws are available with yellow zinc Cr6 plating in 3-micron or 5-micron thicknesses, compliant with ASTM F1941 / F1941M specifications. This protective coating enhances resistance to rust and oxidation while providing a distinctive gold finish for easy visual identification. The plated surface also improves lubricity during installation, supporting accurate torque values and reduced thread galling.

Size Range and Application Versatility

Available in fractional sizes from 1/4" to 1-1/2" in diameter, with lengths up to 13 inches, Grade 8 hex head cap screws offer flexibility for a wide range of heavy-duty applications.

Ideal Applications for Grade 8 Hex Head Cap Screws

Heavy machinery and industrial equipment

Structural steel and load-bearing assemblies

Automotive manufacturing and repair

Construction and infrastructure projects

OEM and precision fabrication

For projects that demand uncompromising strength and long-term reliability, Grade 8 hex head cap screws provide the ultimate fastening solution trusted by professionals across industries.