S-92018A650 5/8"-11 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance with a nylon insert that maintains locking integrity under dynamic loads, reducing the risk of loosening in high-stress environments.
• Enhanced corrosion protection from zinc yellow-chromate plating, extending service life in harsh industrial or outdoor settings.
• High-temperature durability with a nylon insert rated up to 250°F, ensuring reliable performance in thermal cycling applications.
• Optimized load distribution thanks to the 1.33" flange diameter, minimizing surface damage and providing stable fastening without extra washers.
• Precise thread engagement with Class 2B fit and UNC coarse threads, enabling quick installation and consistent torque control.
• Robust mechanical strength from Grade G classification, supporting heavy-duty use in construction, machinery, and automotive assemblies.
• Easy external hex drive for straightforward wrenching, speeding up assembly and maintenance processes.

Professional Applications & Engineering Value

This 5/8"-11 UNC flange lock nut is engineered to address common industrial challenges like vibration-induced loosening and corrosion in demanding environments. The nylon insert creates consistent friction on the bolt threads, providing a reliable locking mechanism that outperforms standard nuts in machinery, automotive suspensions, and structural frameworks. Made from zinc yellow-chromate plated steel, it offers excellent resistance to rust and wear, reducing maintenance needs. The integrated flange design distributes clamping force evenly, preventing surface indentation and eliminating the need for separate washers. Ideal for applications requiring high-temperature tolerance up to 250°F and coarse thread efficiency, this nut ensures long-term stability in heavy equipment, transportation systems, and industrial assemblies where safety and durability are critical.

Specification Summary & Compliance

This flange lock nut adheres to UNC coarse thread standards with a Class 2B thread fit for precise dimensional accuracy. It meets common industry specifications for Grade G strength class and is manufactured with a zinc yellow-chromate plating process that complies with RoHS and REACH environmental directives. The external hex drive and right-hand thread design follow ASME/ANSI guidelines, ensuring compatibility and reliability in professional fastening systems.