Types of Door Closers: Mounting Styles, Grades and Sizes
There are three main families of door closers: surface-mounted (the arm and body you see on the door), concealed (hidden in the frame or door) and floor closers (set into the floor under the door). Within those, you choose by mounting style, grade and size. The right pick depends on how many people use the door, how wide and heavy it is, and whether it is fire-rated. If your closer is already dripping oil, skip ahead: it needs replacing, not topping off.
TL;DR
Surface-mounted closers (regular arm, top jamb, parallel arm) are the most common. Concealed and floor closers are for looks or for doors where an overhead unit will not work.
Grade 1 is for most commercial doors, exterior doors and fire-rated doors. Grade 2 suits light interior commercial use. Grade 3 is for homes.
Size follows door width and weight. A standard 36-inch door usually calls for a size 3 or 4.
A closer that drips oil or suddenly slams has failed seals. Plan on replacement.
Closers that close too slowly, too fast or fail to latch often just need adjusting, and we do that across Miami-Dade.
Table of Contents
The main types of door closers
Surface-mounted (overhead) closers
This is the closer most people picture: a metal body on the door or frame with an arm reaching to the other side. According to LCN’s closer selection guide, surface-mounted closers come in three mounting styles:
Mounting style | Where the body sits | Typical use |
Regular arm | Pull side of the door | Generally interior doors |
Top jamb | Push side, on the frame head | Doors with narrow top rails, such as storefront and aluminum doors |
Parallel arm | Push side, arm runs parallel to the door | Where appearance matters or heavy abuse is expected |
The same LCN document notes that concealed closers fit where aesthetics dictate, and floor closers can be used when an overhead closer cannot.
There is also a split between application-specific closers, built for one mounting style and one hand, and universal closers, which can be mounted three ways on either hand. LCN’s Basics of Closers recommends application-specific units for institutional facilities, because a universal closer has a second potential leak point where the pinion passes through the body.
If you want to see what a Grade 1 surface-mounted unit looks like, browse Grade 1 surface mounted closers to compare body styles and arm configurations.
Concealed closers
Concealed closers hide the mechanism so the door looks clean. LCN describes three kinds: overhead concealed (the cylinder sits in the head frame, the door or a tube), concealed in the door (the cylinder sits in the top rail) and floor spring (installed in the floor beneath the pivot). They are out of sight and, per the same guide, better protected from outside contaminants than surface units.
You see these on glass entrances, offices and lobbies where an arm and body would spoil the design.
Floor closers
A floor closer sits in a recess under the door and pivots it from the bottom. It is used when an overhead closer is not an option, such as frameless glass doors or heavy double-acting doors. Installation involves cutting into the floor, so plan it early in a renovation.
Automatic and hydraulic closers
Search results often list “hydraulic” and “automatic” as separate types. In practice most mechanical closers are hydraulic: a spring closes the door and fluid slows it down. Automatic (power-operated) openers are a different system tied to access control and accessibility needs. If you are weighing powered doors with card readers, our access control and electronic lock services cover that side.
Door closer grades: 1, 2 and 3
Grades come from the ANSI/BHMA A156.4 standard. The current edition, A156.4-2024, covers closers that are surface mounted, concealed in the door, overhead concealed and concealed in the floor, plus pivots for floor closers. Conformance includes cycle, operational, closing force and finish tests.
Grade | Cycle requirement | Where it fits |
Grade 1 | 2,000,000 | Most commercial doors, exterior doors, busy corridors, institutions, fire-rated doors |
Grade 2 | 1,000,000 | Low-traffic interior commercial doors |
Grade 3 | 500,000 | Residential only |
These figures are summarized in this ANSI/BHMA grade guide. One catch from LCN’s Basics of Closers: most commercial and institutional closers meet Grade 1, from slimline to heavy duty, so the grade alone does not tell you which closer you need. Size, material and arm type matter too.
If you manage an office or storefront, our guides to office lock grades and deadbolt grades use the same ANSI/BHMA logic for your locks.
Cast iron or aluminum
Closer bodies are cast iron or aluminum. LCN notes that aluminum can cost less, while many institutions prefer cast iron because it works well with the high-grade steel parts inside and holds up over millions of cycles. For a busy Miami storefront that opens all day, that durability is worth weighing.
Sizing a closer to your door
ANSI/BHMA defines six sizes based on spring force. According to CDF Distributors’ selection guide:
Size | Door width | Door weight |
1 | Up to 27 in | Up to 75 lb |
2 | 27 to 30 in | 75 to 100 lb |
3 | 30 to 36 in | 100 to 150 lb |
4 | 36 to 42 in | 150 to 200 lb |
5 | 42 to 48 in | 200 to 250 lb |
6 | 48 in and wider | 250 lb and above |
The same guide warns against a common mistake: fitting a smaller closer to meet accessibility force limits. If the door will not latch, look first at hinge friction, weatherstripping and latch or strike alignment. Our post on why a door won’t lock walks through those checks.
Codes that affect your choice
Two rules come up on almost every commercial door:
Opening force and closing speed. According to LCN’s summary of the International Building Code, accessible, non-fire-rated swinging doors are limited to 5 pounds of opening force. Other egress doors are limited to 15 pounds to release the latch, 30 pounds to set the door in motion and 15 pounds to reach full open. Closers must be adjusted so the door takes at least five seconds to travel from 90 degrees to 12 degrees from the latch.
Fire doors. ANSI/BHMA A156.4-2024 requires a closer on a labeled fire door assembly to be listed or labeled by a nationally recognized independent testing laboratory.
LCN also notes that NFPA 80 typically recommends a size 3 closer for interior doors, and that exterior doors may fall under state or local requirements. For Miami-Dade specifics, see our ADA door hardware requirements guide.
How to choose: a quick checklist
Measure the door. Width and weight set the size.
Count the traffic. A store door that opens hundreds of times a day needs Grade 1. A bedroom or closet door does not.
Decide where it can mount. Pull side, push side or hidden. Narrow top rails usually point to top jamb mounting.
Check for a fire label. If the door is rated, the closer must be listed or labeled for it.
Think about exposure. Exterior doors in coastal South Florida face humidity and salt air, which is one more reason to favor a durable Grade 1 body.
Have it set up after installation. A correct closer with the wrong speed settings still slams or fails to latch.
Door closer leaking oil: what it means
This is the second most searched question around closers. A hydraulic closer uses fluid as a brake, so a leak means the brake is failing.
How to spot a leak
Dark oil streaks along the closer body, running down the door face or pooling on the floor. NGTECO describes these as signs that fluid has escaped its chamber.
A door that used to close smoothly and now slams. The spring is pushing the door with no hydraulic resistance.
Closing speed that changes from cycle to cycle, which Nashville Door Closer points to as an early sign of seal wear.
A thin oily film on a closer that still closes and latches under control can be assembly residue. National Lock Supply suggests wiping it, marking the spot and rechecking later. Active dripping is a different case.
Why closers leak
Door Closers USA lists two common causes: worn O-ring seals at the valve channels, and valves that were backed out all the way during adjustment. National Lock Supply adds age and over-pressure, for example when someone forces a door past its back-check or a hold-open device is overused.
Repair or replace?
Replace. Elwin Security states that adjusting valves does not repair a failed seal or bring back lost fluid. Locksmith Ledger likewise says hydraulic fluid on the closer, door or floor means the closer is at the end of its life. Closer bodies are sealed under spring tension, so do not try to open one. UAD Garage Doors warns that doing so without industrial tools can cause serious injury.
Two safety points:
Oil on a tile or concrete floor is a slip hazard. Wipe it up and put out a sign until the closer is replaced.
A closer that slams or fails to close can compromise a fire-rated opening, so treat it as urgent on those doors.
If the closer is fine but the door drags, sticks or will not latch, it likely needs adjustment. Read about our door closer adjustment service.
A note on multipoint lock repair
Some readers land here while chasing a door that will not close and lock properly. On doors with multipoint locks, the culprit is often not the closer. Locksmith Ledger reports that misaligned bolts, bent control rods and strikes are the top service issues. Misalignment can come from installation or from the door, frame and saddle shifting over time. Repair starts by finding out whether the problem is alignment, the cylinder, the handle or the internal mechanism, and components like the lock case, gearbox or handle can then be replaced.
The same publication notes that many “lock faults” turn out to be door or hardware problems elsewhere. A closer set too strong can contribute, so it helps to check both together. Our guides to mortise vs. cylindrical locks and commercial door lock types help you identify what is on your door.
Our perspective
A door closer and a lock work as one system. When a customer calls us about a door that will not latch, the lock is only half the story. The closer’s speed, the strike alignment and the hinges all decide whether the bolt catches. That is why we look at the whole opening. We are a licensed and insured locksmith team serving Homestead, Cutler Bay and the rest of Miami-Dade, and commercial doors are part of our daily work. A correctly matched and adjusted closer protects the lock, the frame and the people walking through. Our advice is simple: pick the grade for the traffic, size it to the door, and have it set up properly the first time. When a closer is leaking, replace it promptly instead of waiting for it to start slamming. Julio Borroto
Need help with a commercial door?
We handle commercial locksmith work, deadbolt and door lock installation, rekeying and electronic and access control hardware, with 24/7 availability and bilingual Spanish and English service. If your closer is slamming, dragging or leaving the door unlatched, start with our door closer adjustment page, or see all services on our main site.
For storefronts, our guide to storefront door lock repair covers what to check before you call.
FAQ
What are the most common types of commercial door closers?
Surface-mounted closers are the most common, in regular arm, top jamb and parallel arm mounting. Concealed closers hide in the frame or door, and floor closers sit under the door. Most commercial doors use Grade 1 units.
Can I refill a door closer that is leaking oil?
No. The fluid is sealed inside a pressurized body, and the failed seal is what let it out. Refilling does not restore the seal, so the closer will leak again and lose control. Replacement is the standard fix.
What is the difference between Grade 1 and Grade 3 closers?
Grade 1 is tested to 2,000,000 cycles and is used on most commercial, exterior and fire-rated doors. Grade 3 is tested to 500,000 cycles and is meant for residential use only. Grade 2 sits between them for light interior commercial doors.
What size door closer do I need for a standard door?
A door 30 to 36 inches wide and 100 to 150 pounds takes a size 3. A 36 to 42 inch door up to 200 pounds takes a size 4. Wider or heavier doors move up to sizes 5 and 6.
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