What is a concealed door closer?
A concealed door closer is a door closer hidden from view, so the door closes on its own without a visible arm. There are three common types. A concealed overhead closer sits inside the top of the door and frame. A floor spring sits in a pocket cut into the floor under the door. A closer hinge, like Waterson’s, hides the closing mechanism inside the hinge barrel.
Concealed door closer or closer hinge: which fits my door?
Each type has trade-offs. Concealed overhead closers handle heavy doors well, but they require routing the top of the door and the frame head. Floor springs suit heavy pivot and glass doors, but they need a cut in the floor, which is hard to add later. Closer hinges only need standard hinge mortises, so they are the easiest to install and retrofit. They work on single-acting hinged doors up to 330 lbs.
Do concealed door closers work?
Yes. A good concealed closer closes and latches the door just as reliably as a surface closer, it just stays out of sight. Waterson closer hinges are tested to ANSI/BHMA A156.17 Grade 1, which means 1,000,000 open and close cycles. They also meet ADA requirements for opening force and closing speed.
Can a closer hinge replace a concealed door closer?
In many cases, yes. If your door is hinged, swings one way and weighs up to 330 lbs, a set of Waterson closer hinges can replace both the existing hinges and the concealed closer. You get the same self-closing function without the cutouts in the door head or floor.
What should I check before replacing an overhead or floor closer with closer hinges?
Check these points first:
- Hinge mortises: the frame should take standard full mortise hinges (4", 4-1/2" or 5").
- Door weight and height: the door should be within the rating of the hinge set, up to 8 ft and 330 lbs.
- Swing direction: the door must swing one way, not both ways.
- Latch side clearance: the Waterson barrel is larger than a standard hinge, so check the gap on the latch side.
The cutout left by the old closer will need to be filled or covered.
When should I keep my overhead or floor concealed closer?
Keep the existing closer if the door is heavier than 330 lbs, swings both ways, or hangs on pivots instead of hinges. Frameless glass doors on floor springs usually stay with floor springs too. For those openings, a closer hinge is not the right replacement.
How heavy a door can a concealed closer handle?
It depends on the type and model. Waterson closer hinge sets cover most commercial and residential doors. A 2-hinge set carries up to 150 lbs, a 3-hinge set up to 260 lbs, and a 4-hinge set up to 330 lbs. The aluminum W41M-450-B3 set is a lighter option for doors up to 200 lbs.
Which concealed closer hinge fits my door size?
Pick by door height, weight and thickness:
- 4" x 4" (K51M-400-B3): doors up to 7 ft and 260 lbs, 1-3/8" or 1-3/4" thick. Good for interior doors.
- 4-1/2" x 4-1/2" 3-hinge sets (K51M-450-B3, A3, C3, D3): doors up to 7 ft and 260 lbs, 1-3/4" thick. The standard choice for commercial doors.
- 4-1/2" x 4-1/2" 4-hinge set (K51M-450-B4): tall, heavy doors up to 8 ft and 330 lbs.
- 5" x 5" (K51M-500-B3): thick commercial doors from 1-3/4" to 2-1/4", up to 7 ft and 260 lbs.
Not sure how many hinges you need? See our guide on how many self-closing hinges per door.
What is the difference between mechanical and soft close concealed closers?
Mechanical sets (A and C) use a spring to close the door firmly every time. They are simple and tough. Soft close sets (B and D) add a hydraulic damper, so the door closes slowly and quietly, and wind gusts are less likely to slam it. You can adjust closing force and speed on both. For a full comparison, see soft close vs self close hinges.
Which door closers have a hold-open feature?
In the Waterson line, C sets (mechanical) and D sets (hydraulic) hold the door open at 90°, then close it with a light push. They are handy for offices, classrooms and storage rooms that need to stay open during busy hours. For fire-rated doors, use A or B sets instead, so the door always closes and latches.
Are concealed closer hinges fire rated?
Yes. Waterson fire-rated sets, such as K51M-450-A3 and K51M-450-B3, are UL listed for fire doors up to 3 hours. They meet the NFPA 80 requirement that fire doors close and latch on their own.
How do I install and adjust concealed closer hinges?
Installation is as simple as installing standard hinges. There is no closer arm, track or floor pocket to fit.
- Install all hinges in the order printed on the label, at the factory setting (N).
- Raise the spring tension one number at a time until the door closes and latches on its own from 20°.
- Adjust swing speed first, then latch speed.
- Lock the settings with the 3 mm hex wrench, then fine-tune if needed.
For full steps and videos, see our installation guide and adjustment guides.