Blum TANDEM plus BLUMOTION 563H Undermount Drawer Slide (21 in) Review (2026)
By Nate Sawyer, Editor · Updated July 2026
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- Heavy drawers
- Kitchen reno
- Soft close
- Hidden slides
Blum's TANDEM plus BLUMOTION 563H is the gold-standard 21 in undermount slide: it hides fully under the drawer for a clean furniture look, carries 100 lb with buttery soft-close, and offers 4-way adjustment. But the required front locking devices aren't included, it demands a precisely built drawer box, and it costs far more than side-mounts.
Pros
- Slides hide completely under the drawer box, so you see clean wood sides and get the premium furniture look
- 100 lb rating plus buttery BLUMOTION soft-close handles loaded pot/utensil drawers without sag or slam
- 4-way adjustment lets you dial gaps and reveal perfectly after install — huge for face-frame reveals
Cons
- Front locking devices are required and NOT included — easy to forget and they add ~$3–4/pair
- Demands a precisely built drawer box (depth, notch for the hook) or it won't seat correctly
- Costs far more than side-mount slides, and length options are fixed — no field trimming
Specifications
| Type | Undermount, concealed, full extension |
|---|---|
| Length | 21 in (9–21 in available) |
| Load rating | 100 lb |
| Soft-close | Yes (integrated BLUMOTION) |
| Extension | Full extension |
| Drawer material | 1/2 in–5/8 in sides |
| Adjustment | 4-dimensional (height, tilt, side, depth) |
Frequently Asked Questions
- Do Blum 563H slides come with the locking devices?
- No, and this is the single most common ordering mistake. Front locking devices are required and sold separately at roughly $3-4 per pair. Order them at the same time or your slides arrive unusable.
- How much weight can the Blum TANDEM 563H hold?
- 100 lb per pair, with integrated BLUMOTION soft-close. That covers loaded pot and utensil drawers without sag or slam, which is where cheaper slides start to droop at the front.
- Can you adjust the drawer after installing these?
- Yes, and it is one of the strongest reasons to pay for them. The 563H offers 4-dimensional adjustment - height, tilt, side and depth - so you can dial gaps and reveals precisely after the box is hung. On face-frame cabinets that adjustability is the difference between a good result and a visibly crooked one.
- What does the drawer box have to look like for these to work?
- It has to be built precisely - correct depth and a notch for the hook - or the slide will not seat properly. Drawer sides need to be 1/2 in to 5/8 in. Lengths are fixed from 9 to 21 in with no field trimming, so the box must be built to the slide rather than the other way round.