How To Tighten Kitchen Faucet Nut Under The Sink?

Plumbing issues are common in homes, especially those due to loose nuts under kitchen sinks. Fixing most plumbing issues with the help of professional plumbers can cost a lot and may take time. Surprisingly, you can handle most of these issues in minutes with the proper guidance.

Problems like a loose kitchen faucet caused by a loose nut under the sink do not require mastery of plumbing to fix. An unsecured faucet nut makes it challenging to open and close the tap, so tightening the nut is vital. Typically, faucet nuts under the sink get loose over time.

The under-sink faucet nut’s position and size make tightening the nut a little challenging. However, homeowners can learn how to fix this common faucet problem with the correct tools and processes without calling a plumber.

While tightening an under-sink faucet nut is easy before sink installation, it becomes much more complex with the sink installed since the nut becomes hard to reach. If you need to learn how to tighten faucet nuts, this guide will provide all the information you need, to keep your faucet working optimally. But before then, why do faucet nuts get loose?

Why Do Faucet Nuts Loosen?

Why Do Faucet Nuts Loosen?

During installation, these nuts are tightened correctly and remain secured for some time, but suddenly you notice the faucet is loose due to a loose nut. Why do these nuts get loose if they are adequately tightened? If the faucet nut is unsecured on the sink or leaks water, the most common cause is a loose faucet nut. Loose faucet nuts are common occurrences as they loosen over time.

The good thing about leaking faucets is that you can quickly pinpoint the loose nut by checking the source of the leakage. You must fix the loose nut to save water and secure the tap.

Tools Required

To fix a leaking under-sink faucet nut, you only need a few tools that are easily accessible in most homes. Otherwise, you can borrow from a neighbor or buy from a hardware shop.

  • Adjustable pliers
  • Light source
  • Basin wrench
  • Safety goggles 

Steps to Tighten Kitchen Faucet Nuts The Under Sink

Steps to Tighten Kitchen Faucet Nuts The Under Sink

To begin the short process of tightening loose kitchen faucet nuts under the sink, follow this step-by-step process that showcases everything about securing the faulty nut.

Step One: Clear the Area Under the Sink

The space under a kitchen sink is often used to store other kitchen materials, so you should clear that space before starting. Removing materials from the area will create room to reach the nuts—empty any cabinet under the sink and shelves.

Sometimes the sink’s P trap can block your access to the nuts. You should use a pair of pliers to loosen and remove the P-trap.

Laying a towel under the sink for your head and neck while you work will make it more comfortable to work facing up. You should also wear your safety goggles to protect your eyes, especially as you’ll be working facing upwards to prevent particles from falling into your eyes.

Step Two: Using A Source Of Light

It is hard to see small objects like the faucet nut under the sink because it is dark. With an additional light source like a headlamp or torch, you improve the light in the area and make it easy to tighten the nuts. Headlamps are best suited as they are hands-free, leaving your two hands available to handle the nuts.

Step Three: Reposition the Faucet

When the nut is loose, the faucet will most likely move out of position, thereby facing an unnatural position. Before tightening the sink, you must return the faucet to its correct position.

Do this by inserting the faucet back into the faucet hole through the sink and then aligning it with the wall behind it. You may need an extra pair of hands to get this right, as holding the faucet and the sink in place while tightening the nuts can be difficult.

You want to avoid securing the nuts, and you notice the tap is facing a different direction outside the sink. While the extra help is holding the faucet, secure the nut under the sink.

Step Four: Tighten Using a Basin Wrench

Use your hands to turn the nuts while the faucet is still aligned and held down by your extra helping hands. Holding it will ensure the tap does not shift while you tighten the nut. However, there’s only so much you can do with your hands, as your hands will not secure the nuts to the right level, which is why you also need a tool like a basin wrench.

A basin wrench comprises jaws that hold the nut, a long handle, and a tee end for leverage when turning the handle. The jaw end is spring-loaded and adjustable, so you can grab different nut sizes, while the long handle and tee end makes it possible to reach tricky corners under the sink.

Place the nut between the wrench jaws and turn the handle clockwise to tighten a loose kitchen faucet nut. You’ll see an indication of the correct turning direction for each activity on the T-bar. If the nuts are rusted, put some penetrating solvent on them so the wrench grips them properly. Ensure the nut is tight but not too tight that it gets stuck or strips.

Step Five: Replace P-trap and Under Sink Materials

It gets easier after tightening the nut and ensuring the faucet is aligned correctly in the sink and with the back wall. The final step involves replacing other materials and pipes you may have removed, like the sink’s P-trap and kitchen utensils. Reinstall the P-trap while ensuring it is tightly secured before returning the materials taken from under the sink.

Other Materials to Tighten Kitchen Faucet Nuts

The basin wrench is one of many tools for tightening kitchen faucet nuts, with other tools proving to be effective faucet nut tighteners. Most of the devices in this list are stop-gap options for when a basin wrench is unavailable.

Zip Tie

Zip ties are household materials you can use to seal bags, organize cables, and more; however, they can also help to tighten a loose kitchen faucet nut under the sink. First, turn the nut with your hands before placing the zip tie around the nut. Tighten one end and drag the other end clockwise to tighten the nut.

Duct Tape

Duct tape can do more than seal damaged parts; it can tighten loose nuts. To use the duct tape, turn the nuts in a clockwise direction using your hands before turning to the versatile duct tape to complete the task.

Wrap a small piece of duct tape around the nut head and repeat the process with the same size. Leave a little duct tape so you can drag it in a clockwise direction, which will tighten the loose faucet nut.

Bolt and Nut

Bolt and nut are the most unlikely materials to tighten loose kitchen faucet nuts, but they are effective. Connect the bolt and nut before placing them on the faucet nut, ensuring they are in contact with the bolt thread. By turning the nuts in a clockwise direction, you tighten them up.


Tightening up loose nuts may seem like a straightforward task, and it is. Still, it can pose many challenges for some people, which is why we’ve compiled popular questions about tightening loose kitchen faucet nuts under the sink and their answers.

How do you know when you should tighten kitchen faucet nuts?

One of the primary signs of a loose faucet nut is an out-of-position faucet. When the tap is out of position, using water in the sink becomes difficult. Sometimes, you may notice leaks from the nut area, indicating a loose nut that requires tightening.

How to tighten faucet nuts without a basin wrench?

You can use a coin, duct tape, bolt and nut, zip tie, and more, which are regular household items, instead of a basin wrench.

How do you know when the faucet nut is tight enough?

Since tightening the kitchen faucet nut is essential, many people over-tighten the nut in error. Tighten till the nut does not turn anymore when applying normal pressure.


The best tool for tightening kitchen faucet nuts under the sink is the basin wrench, with other nonconventional means like coins and duct tape also being effective ways to keep the nuts tight. This guide shows the process of tightening loose faucet nuts.