Slide types compared
- Side-mount ball-bearing: The workhorse. Mounted on the sides of the drawer and cabinet. Full extension, high load rating (75-150 lb), moderate cost ($5-25 per pair). Most common in kitchen and workshop cabinets.
- Under-mount soft-close: Hidden beneath the drawer box. Premium look, soft-close action. Higher cost ($25-75 per pair), lower load rating (75-100 lb typical). Requires precise drawer box dimensions.
- Center-mount: Single slide mounted under the drawer center. Cheaper than side-mount, less stable, lower load rating. Common in inexpensive furniture and file cabinets.
- Wood-on-wood: Traditional drawers with waxed runners. Silent, no metal wear, but less smooth and no soft-close. The choice for high-end reproduction furniture.
Sizing rules
- Slide length should equal the cabinet's interior depth minus 1" (some manufacturers spec this differently — check your slide's documentation). For a 22" cabinet interior, use a 21" or 20" slide.
- Drawer depth should be 1-2" shorter than the slide length. The drawer sits inside the slide rails.
- Side clearance depends on slide type. Side-mount: 1/2" each side (total 1" wider cabinet than drawer). Under-mount: 3/4" each side. Center-mount: 0 clearance (slide under drawer).
Load rating reality check
The "load rating" on a slide box is the maximum static load. In practice:
- Static load: Standing still with weight on the drawer. The slide can hold its rated load.
- Dynamic load (sliding): Moving with weight on the drawer. The slide can hold about 75% of the static rating.
- Impact load: Slamming a drawer with weight. The slide holds about 50% of the static rating.
For a clothes drawer rated 75 lb static, the practical working load is about 40-50 lb. Plan accordingly.
Soft-close mechanism
Soft-close slides use a hydraulic damper that catches the drawer in the last 1-2" of travel and gently pulls it closed. They cost more than standard slides ($20-50 per pair extra) but:
- Eliminate slamming (good for households with kids)
- Reduce wear on drawer fronts
- Add a high-end feel
Soft-close slides require precise drawer box dimensions — too tight and they bind, too loose and they don't engage the damper. Most need 1/2" to 3/4" side clearance.
Common drawer slide mistakes
- Slide too long: Won't fit in the cabinet. Slides must be at least 1" shorter than cabinet depth.
- Slide too short: Drawer doesn't open fully or feels unstable.
- Wrong side clearance: Slide binds or wobbles.
- Mounting screws too long: Poke through the drawer side. Use #8 × 5/8" screws for 1/2" drawer sides.
- Drawer box twisted: Won't slide smoothly. Check that the box is square before mounting slides.
How to mount side-mount slides
- Mount the cabinet member first. Use a spacer block to set the right height from the cabinet bottom.
- Separate the drawer member. Most slides come apart — pull the inner rail forward and off.
- Mount the drawer member on the drawer box. Align flush with the front edge.
- Reassemble the slide and test fit. Make adjustments to centering before final screws.
- Install the drawer face after the box is mounted and sliding smoothly.
Frequently asked questions
Why is my drawer binding on one side?
Either the slide is mounted slightly off (one side higher than the other), or the drawer box is twisted. Loosen one slide and re-align.
Can I use the same slide length for shallow and deep drawers?
Yes — slide length determines the cabinet depth it fits in, not the drawer depth. You can have a 16" slide with a 14" drawer box.
What's the difference between 32mm and traditional slide mounting?
32mm system uses pre-drilled holes in cabinet sides, spaced 32mm apart. This is the European cabinet standard. Most quality side-mount slides are now 32mm-compatible.