Nuts, a fastener type that works in conjunction with bolts, are often used to join objects together. They're threaded through the end of the bolt, which twists over them to secure the joined pieces.
Flange nuts are a unique type of nut, but they still require the use of a bolt to lock the items together securely. These hex nuts feature a wide flange near one end that acts as an integrated washer, spreading the load over a larger surface area to prevent damage to the installation material.
Hex flange nuts can be serrated or non-serrated and come in both standard right-hand and Unified inch coarse series (UNC) and fine (UNF) threads. They're usually made from zinc plated steel, although stainless steel is also an option.
Prevailing Torque Type Locknuts
Flange lock nuts feature a prevailing torque locking feature that's effective only when the bolts are fully engaged with the hex nut and both of their threads. They're often called "locking nuts" because they resist loosening even if the bolts aren't completely seated.
Serrated Flange Nuts
Serrated flange nuts, also called spin lock or serrated tooth nuts, feature a flange that extends the bearing surface to cover oversized holes and recessed surfaces. They also have serrations on the flange that contact the mating surface, creating a lock effect and making them more resistant to vibrations. These types of nuts can be reused without a washer, but it's important to follow the manufacturer's recommendations for nut reuse, thread lubricants and torque values when using these fasteners.
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