How to Tighten Sink Screws

Written by nathan mcginty
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How to Tighten Sink Screws
Keep your sink securely in place with sink screws. (sink and faucet image by MAXFX from

Sink screws work by fastening into the bottom of the sink and securing it to the countertop above. They are used on all different models of bathroom and kitchen sinks, including ceramic, porcelain and stainless steel. If you are installing a new sink or just remodelling an old one, one of the last things you will have to do before using your new fixture is to tighten the sink screws. This will give your sink a secure footing for years to come.

Skill level:

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  1. 1

    Align the sink clips (the part below the screw) so that they are on the underside of the sink counter. How you do this depends on your installation. Some sink clips hook directly into the underside of the sink. Other models slide in through a channel on the bottom of the sink and are held in place by a T-shaped head on the screw. The sink clips need to be aligned properly so that when you tighten the sink screws, they grip the countertop and hold the sink in place.

  2. 2

    Start with one screw in the corner of the sink. Tighten this a few turns until the sink clamp makes contact with the countertop. Do not worry about making it tight. Right now you just want to make sure all the screws are securing the clamps in the right position.

  3. 3

    Go to the sink clamp at the opposite side of the one you just tightened. Tighten this clamp as you did with the last one, by turning it until it makes contact with the counter.

  4. 4

    Go to one of the sink screws adjacent to the one you tightened in step 2. Tighten this in the same way.

  5. 5

    Repeat this process of tightening the screws that are opposite of each other until the sink clamps are all in contact with the counter. Keep an eye on the sink position in the countertop as you tighten the screws to make sure it is not moving out of position.

  6. 6

    Go back to the first sink screw from step 2. Tighten this so that the clamp begins to grip into the counter. Repeat this process for the other screws, making sure to alternate from one side to the other.

Tips and warnings

  • Do not over-tighten the screws, as this may bend them or cause the brackets holding them in place to break.

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