Soft Close Drawers: Facts About Undermount Slides

By Richie DeMarco | Posted: 04/16/2013 10:07AM


Richie DeMarco At least once a week I receive a call from a customer thinking about using undermount drawer slides.

The conversation always goes the same way - what are the specs, what do I need to do to my drawer and/or my closet to make it work...

Here is all that you need to know:
• Even though the slide is referred to as an “undermount” it still mounts to your vertical panels and will probably hit your system holes... Your drawer sits on top of the slide, that’s where “undermount” comes from.

• The drawer spacing is different. Normally your drawer width is an 1” less your opening. When using an undermount the spacing changes depending on the thickness of the material you are using. If you are using 1/2” material, the drawer is 5/8” less your opening. If you are using 5/8” material, the drawer is 3/8” less your opening.

• Undermount slides don’t come every two inches. Most undermounts come 9”, 12”, 15”, 18”, and 21”. The size refers to your drawer box depth. Your vertical should be an inch deeper than the drawer. There are a handful of companies on the market that make a 13” undermount, I sell King Slide, my customers are happy with it.

• If you’re outsourcing your drawers that’s all you need to know. For a few dollars more per drawer, most companies will prep your order for undermount slides... Trust me this is the best $3 you will ever spend.

• If you insist on manufacturing the drawers yourself, you need to recess the drawer bottom 1/4” so that you can mount the front clips. You also need to to notch the back of the drawer and drill a 10mm hole to lock the slide in place.

I hope this post helps you feel a little more comfortable with undermount slides. If you have any questions please feel free to contact me at

Check back next week when I review the pros and cons of side mount soft close slides...

P.S. Denise Butchko and I have scheduled an in-depth “How To” course on Houzz on May 3rd. Register early because space is limited... Hope to see you there!



About the Author

Richie DeMarco

Richie DeMarco was declared “The Mayor of Hardware” at the 2011 Closet Expo. With nearly 15 years of experience he has moved up the ranks at Eveready Hardware and is currently the vice president. He serves on the Board of Directors for the ACSP and moderates the LinkedIn group Hardware Nation. He can be contacted at or follow him on Twitter @MayorOfHardware.

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