S-90602A211 1/4"-20 x 5/8" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged 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 industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and reducing loosening over time.
• Flanged head design distributes clamping force evenly, eliminating the need for separate washers and speeding up installation.
• Grade 8 material hardness (Rockwell C32) offers excellent wear resistance, maintaining fastener integrity under repeated loads.
• Coarse UNC threading allows for quick and easy installation, even in materials where fine threads might strip or bind.
• External hex drive compatibility enables straightforward tightening with standard tools, improving efficiency in assembly lines.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, structural frameworks, and automotive components. Its zinc yellow-chromate plated steel construction provides robust protection against rust and chemical exposure, ensuring longevity in demanding environments. The fully threaded UNC coarse thread design enhances grip strength in various materials, reducing the risk of stripping while the flanged feature simplifies installation by acting as an integrated washer. With a 150,000 PSI tensile strength and Rockwell C32 hardness, it withstands extreme vibrations and loads, making it ideal for applications where reliability is non-negotiable, such as in construction equipment or manufacturing fixtures.

Specification Summary & Compliance

This fastener adheres to Class 3A thread fit for precise dimensional accuracy and features a 1/4"-20 UNC coarse thread with right-hand direction. It complies with IFI 111 and SAE J429 specifications, ensuring consistency with industry standards for Grade 8 heavy-duty screws. The product meets common regulatory requirements for industrial use, including RoHS and REACH, supporting safe and sustainable procurement.