S-92620A596 5/16"-18 x 3 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capability with 150,000 PSI tensile strength and Rockwell C33 hardness for reliable performance in high-stress environments
• Superior corrosion protection through zinc yellow-chromate plating that extends service life in harsh industrial conditions
• Easy installation and removal with standard external hex drive design compatible with common wrench tools
• Precise thread engagement with Class 2A fit UNC coarse threads ensuring consistent fastening and vibration resistance
• Full-length threading provides maximum grip and load distribution across the entire fastener length
• Heavy-duty construction meeting Grade 8 specifications for the most demanding industrial and construction applications
• Standard compliance assurance with ASME B18.2.1 and SAE J429 standards for quality and interoperability

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional reliability in construction, machinery assembly, and structural frameworks where failure is not an option. The zinc yellow-chromate plating provides superior corrosion resistance, significantly extending service life in environments exposed to moisture, chemicals, and outdoor elements. With 150,000 PSI tensile strength and Rockwell C33 hardness, these fully threaded UNC fasteners maintain integrity under extreme vibration and dynamic loads. The coarse thread design ensures quick installation and superior holding power in both metal and composite materials, while the external hex drive allows for high-torque application without stripping. These 5/16"-18 x 3½" screws are specifically designed to meet the rigorous demands of industrial maintenance, heavy equipment manufacturing, and critical infrastructure projects.

Specification Summary & Compliance

This Grade 8 hex head screw features precise 5/16"-18 UNC coarse threads with Class 2A fit tolerance ensuring consistent engagement and reliable performance. Manufactured to exacting ASME B18.2.1 and SAE J429 specifications, the fastener delivers guaranteed dimensional accuracy and mechanical properties. The zinc yellow-chromate plating meets industry standards for corrosion protection while maintaining the screw's structural integrity. With a total length of 3½ inches and fully threaded design, this high-strength steel fastener provides optimal load distribution and secure fastening in the most demanding industrial applications.