Flange Nuts

What is a Flange Nut and how are they used

Flange nuts have a wide flange under the hex that acts as a washer, helping to distribute pressure evenly over the parts being secured.

More information about Flange Nuts

• Flange nuts work extremely well for oversized or irregularly shaped holes since the flange will cover any discrepancies on the mating surface.
• Serrated flange nuts have angled serrations that bite into the material you are fastening against to prevent the nut from turning loose.
• Serrated lock nuts provides better vibration resistance than a standard hex nut.
• The serrations on the flange will scratch or mar a surface. If you’re using them on a painted or coated surface (or moisture could be an issue), it is best to choose a fastener that will not remove the coating and expose the mating surface to the possibility of corrosion.

Flange Bolts And Nuts: Key Features of Flange Nuts

Flange Nuts have a few key distinctive features, which we'll discuss below.

Coarse Threading

Flange nuts, such as exhaust flange nuts and bolts, typically have much coarser threading than most other nuts. This attribute enables them to fasten more securely in applications without a perfect fit.

A Wide Flange

Flange nuts feature a wide flange that distributes pressure evenly across the application, allowing them to remain secure even when the hole is larger than required.

FAQs About Flanged Nuts

What is the benefit of a flange nut?

The wide flange down one side of the flanged nut distributes the pressure equally across the entire nut. This reduces the risk of damage to the part and makes the nut less likely to come loose due to an uneven fastening surface. In this regard, flanged nuts are similar to lock nuts.

Do you need to use a washer with a flange nut?

Typically not. Unlike standard hex nuts, flange nuts already contain a large load-bearing surface on one end, and they are typically okay to use without the addition of a washer.