Fitting a traditional wood-on-wood drawer can take some careful work. Even after you achieve a good fit, seasonal wood movement and wear can affect how smoothly the drawer operates.
Metal drawer slides offer another option. They simplify drawer installation, provide smooth operation, and are especially useful for cabinetry, utility drawers, and other projects where reliable operation is a priority.
The challenge is that there are a lot of drawer slides to choose from. Fortunately, you can narrow the choices quickly by considering four things: mounting style, clearance, load capacity, and extension.
How Drawer Slides Work
The ball-bearing drawer slides commonly used in furniture and cabinetry consist of two or more nesting sections. One section attaches to the drawer, while the remaining assembly mounts inside the case.
As the drawer opens, the sections telescope outward. When the drawer closes, they nest together into a compact assembly.
Many slides also allow the drawer member to separate from the case member. This makes installation easier and allows the drawer to be removed from the cabinet when necessary.
Drawer Slide Mounting Styles
One of the first decisions is where you want the slides mounted. The three styles shown here each have different space, installation, and load considerations.
Side-Mount Drawer Slides
Side-mount slides are installed between the drawer sides and the cabinet.
A typical side-mount installation requires 1/2" of clearance on each side of the drawer. That means the drawer box is normally built 1" narrower than the opening.
That clearance needs to be considered before you build the drawer. When you're working from a particular set of slides, use the manufacturer's specified clearance rather than assuming every model is identical.
Side-mount slides are a practical choice because they're easy to install and provide support on both sides of the drawer.
Bottom-Mount Drawer Slides
The bottom-mount style shown here is similar to a side-mount slide, but tabs on the drawer member allow it to fasten along the bottom edge of the drawer side.
This makes positioning the drawer member straightforward and provides a solid mounting surface.
The tradeoff is clearance. In addition to side clearance, this style requires additional space below the drawer. The example shown requires approximately 5/8" of additional vertical clearance.
Center-Mount Drawer Slides
A center-mount slide uses a single slide beneath the middle of the drawer. The drawer member attaches to the drawer bottom or to a cleat, while the case member is installed in the center of the opening.
The big advantage is appearance: the hardware is hidden, and relatively little side clearance is required.
The tradeoff is support. With only one slide beneath the drawer, the center-mount design shown is intended for lighter-duty applications.
Check Drawer Slide Clearance Before Building
Clearance is one of the most important drawer-slide specifications because it directly affects the dimensions of the drawer box.
For the side-mount slides discussed here, the standard is 1/2" per side. But rather than building the drawer first and hoping the hardware fits, it's better to select the slides before determining the final drawer width.
WOODSMITH TIP: Buy the Slides First. Choose your drawer hardware before building the drawer box. Once you know the required side and vertical clearances, you can size the drawer to fit the opening and the hardware instead of trying to adapt one to the other afterward.
Consider Drawer Slide Load Capacity
Drawer slides are rated according to how much weight they can support. That rating includes both the drawer itself and everything stored inside it.
The slides described here provide a useful example of how ratings can vary. Quality side-mount slides were available with ratings starting around 75 lbs., with 100-lb., 200-lb., and heavier versions available. The center-mount slides discussed were rated considerably lower, around 25 to 35 lbs.
Those numbers shouldn't be treated as universal specifications for today's hardware. Check the manufacturer's load rating for the particular slide you're installing.
For an ordinary furniture drawer, you may not need an especially heavy-duty slide. A large tool drawer or heavily loaded shop cabinet is another story.
Choose the Right Drawer Extension
The next consideration is how far you want the drawer to open. Drawer slides generally fall into three useful categories.
3/4-Extension Slides
A 3/4-extension slide allows the drawer to open approximately three-quarters of its depth. They're functional, but part of the drawer remains inside the cabinet. That can make items stored at the back harder to reach.
Full-Extension Slides
Full-extension slides allow the drawer to travel approximately the full length of the slide. An 18"-long full-extension slide, for example, extends approximately 18".
For many furniture, cabinet, and shop-storage applications, this provides much better access to the entire drawer.
Overtravel Slides
Sometimes even full extension isn't enough.
If a drawer sits beneath an overhanging countertop or benchtop, an overtravel slide allows the drawer to move beyond the front of the case. The slides described here provide roughly 1" of additional travel.
This can make the back of the drawer considerably easier to reach.
Drawer Slide Features at a Glance
Installing Drawer Slides in Face-Frame Cabinets
Face-frame cabinets introduce another installation issue. The inside face of the frame may not be flush with the cabinet side, leaving the drawer slide without a continuous mounting surface.
There are a couple of straightforward solutions.
Add a Wood or Plastic Spacer
A spacer can bridge the distance between the cabinet side and the inside edge of the face frame. Once the spacer is positioned correctly, the case member of the drawer slide can be screwed to it.
This creates a solid mounting surface and keeps the slide parallel to the drawer opening.
Use a Rear Mounting Bracket
Another option is a bracket that attaches to the rear of the cabinet and supports the back end of the slide.
This can be especially convenient when the cabinet construction makes adding a full-length spacer unnecessary or inconvenient.
Plan the Drawer Around the Slides
Drawer slides take much of the fuss out of fitting and operating a drawer, but the hardware needs to be considered as part of the drawer design—not as an afterthought.
Start by choosing the mounting style and extension you want. Then verify the manufacturer's requirements for clearance, slide length, mounting position, and load capacity. With those dimensions in hand, you can build the drawer box to fit the hardware and install it with far fewer surprises.
Metal slides aren't necessary for every drawer. But for frequently used furniture, cabinetry, and shop storage, they're a practical way to get smooth operation and reliable access.
Build a Better Drawer Box
Once you've chosen your drawer slides, the next step is building the drawer itself. Compare rabbet, tongue-and-dado, and locking-rabbet joints to find the right combination of strength, appearance, and construction time for your project.
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