S-91627A112 5/8"-18 Flange Nuts

Key Features & Benefits at a Glance

• Exceptional strength and reliability with Grade 8 classification, ensuring high tensile strength for heavy-duty applications and preventing failure under extreme loads.
• Superior corrosion resistance due to zinc yellow-chromate plating on steel, providing long-lasting protection in harsh environments and reducing maintenance needs.
• Enhanced vibration resistance and secure fastening from the integrated flange design, which distributes clamping force evenly and eliminates the need for separate washers.
• Precise thread engagement with 5/8"-18 UNF fine threads and Class 2B fit, offering reliable, tight connections that minimize loosening in high-vibration settings.
• Easy installation and removal using the standard external hex drive, compatible with common tools for efficient assembly in industrial and automotive applications.
• Optimized load distribution thanks to the 1 9/32" flange diameter and 0.12" thickness, which help prevent surface damage and improve joint integrity.
• Durable performance in demanding conditions with right-hand threading and robust steel construction, ideal for machinery, construction, and transportation equipment.

Professional Applications & Engineering Value

This Grade 8 flange nut is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in heavy machinery, automotive assemblies, and structural frameworks. The zinc yellow-chromate plated steel construction provides a robust barrier against rust and wear, extending service life in outdoor or humid environments. Its UNF fine threads and Class 2B thread fit ensure precise alignment and secure fastening, reducing the risk of thread stripping under high torque. The integrated flange acts as a built-in washer, distributing pressure over a wider area to prevent material deformation and maintain clamping force in dynamic applications. Ideal for use in construction equipment, truck assemblies, and industrial machinery, this nut delivers reliable performance where high strength and vibration resistance are critical, streamlining maintenance and enhancing safety.

Specification Summary & Compliance

This flange nut adheres to standardized dimensions, including a thread size of 5/8"-18 UNF with Class 2B thread fit for consistent accuracy. It meets industry standards for Grade 8 strength, ensuring compliance with high-load requirements. The zinc yellow-chromate plating aligns with RoHS and REACH directives for environmental safety, while the design supports common industrial specifications for durability and performance in demanding settings.