S-90602A212 1/4"-20 x 3/4" 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 guarantees secure, vibration-resistant connections, enhancing assembly integrity and safety.
• Flanged hex head design provides integrated washer functionality for increased load distribution and simplified installation.
• High hardness (Rockwell C32) offers excellent wear resistance, maintaining thread integrity through repeated use.
• Coarse UNC threading enables quick assembly and disassembly, improving efficiency in maintenance and production workflows.
• Full threading along the 3/4" length ensures maximum grip and holding power across the entire fastener engagement.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The zinc yellow-chromate plated steel construction provides superior corrosion protection in manufacturing, automotive, and heavy machinery environments, addressing common issues of rust and degradation. The external hex drive and coarse UNC threading facilitate rapid installation in high-volume assembly lines while maintaining Class 3A thread fit precision for vibration-prone applications. The integrated flange eliminates the need for separate washers, streamlining inventory and reducing assembly time. These heavy-duty screws are specifically designed to withstand extreme mechanical stresses, making them ideal for structural connections, equipment frames, and critical machinery components where 150,000 psi tensile strength and Rockwell C32 hardness ensure long-term reliability.

Specification Summary & Compliance

This fastener features precise 1/4"-20 UNC coarse threading with Class 3A thread fit tolerance for superior engagement. The 3/4" length and 9/16" flange diameter provide consistent dimensional accuracy. Manufacturing complies with SAE J429 and IFI 111 specifications, ensuring material quality and performance standards are met for Grade 8 requirements. The product meets industry standards for heavy-duty mechanical fasteners and conforms to RoHS and REACH environmental regulations.