· by Michael Blair, Nashville's Cabinets
Kitchen cabinet doors drift. A door that hung straight when the kitchen was new droops at the handle side, rubs the door beside it, sits proud of the frame or refuses to stay shut. Seasonal humidity plays a part: the moisture chapter of the Forest Service’s Wood Handbook explains that wood swells as it gains moisture from the air and shrinks as it loses it, with the seasons and even from day to day. In our experience hinge screws also work loose over years of opening and closing. Most of it can be put right with the hinge, because concealed hinges are built to be adjusted, and Blum’s installation sheet for its CLIP top BLUMOTION hinge lists adjustment for side, height and depth.
Reading the door
Stand in front of the cabinet with the door closed and look at the gaps. A door that hangs crooked and rubs the door next to it at the top or bottom needs side adjustment, usually on one hinge. If the gap to its neighbor is even but too wide or too tight, or the door overlaps the frame more on one side, the whole door has to shift sideways, and we turn both hinges by the same amount. A door whose top edge sits higher or lower than the door beside it needs height adjustment, which on Blum’s concealed hinges is made at the mounting plate rather than on the arm. A door that sits out from the face of the cabinet at the top or bottom, or does not touch the bumper, needs depth adjustment.
A door that closes and then springs back open is often touching something on the way, a drawer front or the door beside it, so we look for contact before we touch the hinge, and only then suspect the hinge itself. A small, light door with soft-close on both hinges can stall short of shut, and Blum’s sheet says the soft-close can be switched off on one of the two hinges on small or light doors. On an older cabinet with a magnetic catch, a door that will not stay closed gets its catch checked first.
The three screws on a concealed hinge
A concealed cup hinge has a cup set into the door and an arm that clips or screws to a mounting plate on the cabinet side; Blum’s CLIP top planning drawings show plates of both kinds, screw-on and knock-in. On that hinge, according to Blum’s adjustment instructions, the front screw on the arm changes the door overlay, moving it sideways by up to 2 mm either way, and the rear cam screw sets the gap between door and cabinet, 3 mm out or 2 mm in. Height lives on the mounting plate: a cam screw where the plate has one, and on plates without a cam, you loosen its screws, move the door and tighten them again. Other brands lay their screws out differently, so we look at the hinge before turning anything.
Those ranges are small, so turn a little, close the door, look, and turn again. When we change height or depth we usually set both hinges, so the door does not twist; that is our habit, not a manufacturer’s rule. If a screw turns and the door does not move, we check that the arm is still seated on its plate. Blum’s instructions for reattaching a clip hinge say to squeeze the hinge and mounting plate together until the plate snaps on.
- Side to side: the front screw on the arm, often one hinge at a time
- In and out: the rear screw or cam on the arm, usually both hinges
- Up and down: the cam or the slotted screws on the mounting plate
- Springs back: look for contact first, then the hinge
Why does a door keep sagging after the hinge is adjusted?
A door that sags no matter how the hinge is set usually has hinge screws pulled loose from the door or the cabinet. Particleboard is a common cabinet box material, and the Wood Handbook’s chapter on fastenings warns that screws tightened into particleboard can strip their threads, recommending a modest tightening as the compromise between holding power and stripping. Once a hole has stripped, the hinge rocks. Our repair is to plug the hole with glued hardwood, let it cure, and drive the screw again, snug rather than cranked down. The same chapter shows holding power climbing with how deep the threads are embedded, so a slightly longer screw can help, as long as it cannot come out the face of a door; for reference, Blum’s 40 mm to 35 mm conversion instructions call for #6 x 5/8 inch wood screws in the cup and #7 x 3/4 inch in the plate. If the hinge cup has cracked out of its bore in the door, we fill the bore and drill it again.
A tall or heavy door that keeps dropping may need another hinge rather than tighter screws, since Blum’s hinge quick reference notes that door weight can determine how many hinges a door needs. Older face-frame cabinets with surface-mounted or semi-concealed hinges have little or no adjustment; a sagging door on those is usually a stripped screw or a bent hinge, and we repair the holes or swap in a matching hinge.
Why does a wood door rub in summer but not in winter?
A solid wood door that rubs in August and clears in January is moving with the humidity. The Wood Handbook’s moisture chapter puts numbers on it: at 70 degrees Fahrenheit, wood settles at about 6.2 percent moisture in air at 30 percent relative humidity and about 13.1 percent at 70 percent, and it swells and shrinks most across the growth rings and only slightly along the grain. So the adjustment that fixes the door in one season leaves a gap in the other. We set it for the humid months with a little clearance and accept a slightly wider winter gap, or look at the humidity in the kitchen, since the wood follows the air; our post on cabinet materials in Nashville humidity covers what that means for the boxes. The same chapter notes that this swelling and shrinking can warp wood, and a door that has warped, twisted so one corner stands off the frame while the others touch, cannot be adjusted flat. We replace it, and when several doors have gone that way, refacing with new doors and fronts is worth pricing against one-off replacements.
Hinges themselves wear. A soft-close hinge that has stopped soft-closing, a spring that no longer holds, a hinge arm that has cracked: these are replaced, and the bore in the door decides what fits. Blum’s CLIP top drawings show a 35 mm cup, but some older doors were bored at 40 mm, and Blum’s conversion instructions say its current hinges cannot use those holes, so new 35 mm cup holes have to be drilled. We measure the bore and its distance from the door edge before ordering anything. Blum also sells a soft-close version, CLIP top BLUMOTION, and new hinges, soft-close included, are part of our hardware and storage work. If a door in your kitchen will not behave, ask us to take a look.
Sources
- Blum, CLIP top BLUMOTION installation instructions — Three-dimensional adjustment: front screw for side/overlay (±2 mm), rear cam for depth (+3/-2 mm), cam or loosened screws on the mounting plate for height (±2 mm); soft-close can be deactivated on one hinge of a small or light door
- Blum, CLIP top BLUMOTION, CLIP top, CLIP planning document (2024) — Screw-on and knock-in mounting plates; 35 mm cup bore
- Blum, Clip mechanism reattachment and mounting plate installation/removal (2026) — Squeeze hinge and mounting plate together until the plate snaps on
- Blum, 40 mm to 35 mm hole conversion instructions (2026) — 40 mm cup holes cannot be used with current hinges; new 35 mm cup holes; #6 x 5/8 and #7 x 3/4 wood screws
- Blum, Hinge Quick Reference — Door weight can determine the number of hinges required
- Blum, CLIP top BLUMOTION downloads and videos — Soft-close version of the CLIP top hinge, with side, height and depth adjustment
- USDA Forest Products Laboratory, Wood Handbook (2021), Chapter 4: Moisture Relations and Physical Properties of Wood — Wood swells and shrinks with seasonal and daily humidity; equilibrium moisture 6.2% at 30% RH and 13.1% at 70% RH at 70 F; movement greatest across the rings, slight along the grain; can warp
- USDA Forest Products Laboratory, Wood Handbook (2021), Chapter 8: Fastenings — Screws in particleboard can strip; modest tightening is the compromise; withdrawal resistance rises with embedment depth
FAQ
Cabinet Doors That Sag, Rub or Will Not Close — questions
Why does my cabinet door not close all the way?
Either it is hitting something, usually an adjacent door or a drawer front out of alignment, or its depth setting has the door standing off the cabinet face. Check for contact first, then turn the depth screw at the back of the hinge arm, which on Blum’s CLIP top has only a few millimeters of travel. We usually set both hinges the same so the door stays square.
How do I fix a cabinet door that sags?
If the hinge screws are tight, raise the door at the mounting plate, with the height cam if the plate has one or by loosening the plate screws and sliding it up. If the door drops again or the hinge rocks, the screw holes have stripped; we plug them with glued hardwood, let them cure, and remount without overtightening.
Can cabinet hinges be replaced without replacing the doors?
Usually. Blum’s concealed hinges use a 35 mm cup, but some older doors were bored at 40 mm, and Blum says its current hinges cannot use those holes, so new cup holes have to be drilled. Measure the bore and how far it sits from the door edge before ordering. Where the bore matches, soft-close hinges are a common upgrade on an older kitchen.
How many soft-close hinges does a cabinet door need?
Most cabinet doors hang on two hinges, but a tall or heavy door may need more, since Blum’s hinge quick reference says door weight can determine the count. Soft-close need not be on every hinge: on a small, light door, Blum says it can be switched off on one so the door does not stall short of shut.