Key takeaways
- Identify the door material before approving any hardware change; the same lock behaves differently on hollow metal, wood, storefront aluminum, and glass.
- A commercial opening is a system: door, frame, hinges, latch, strike, closer, threshold, and any electrified hardware succeed or fail together.
- In a hollow metal door, hardware must fasten to internal reinforcement, never to the steel skin or the honeycomb core.
- Storefront aluminum leaves little tolerance: backset, reinforcement, and wire paths should be verified before anyone cuts a narrow stile.
- Tempered glass and automatic doors accept only hardware approved for that system; drilling or grinding glass is never an option.
- Photograph the full opening, the door edge, the frame prep, and every label before hardware work is approved.
Identification
How do you tell which type of commercial door you have?
Four materials cover most commercial openings. Each one can be identified from the face, the edge, and the frame without removing any hardware.
| Door type | How to recognize it | Verify before hardware work |
|---|---|---|
| Hollow metal | Painted steel faces, a visible seam along the door edge, a metallic sound when tapped, and often a matching steel frame at exteriors, stairwells, and service areas | Steel gauge, internal reinforcement locations, the existing hardware prep, and any fire label on the door or frame |
| Commercial wood | Wood grain or a solid painted edge without a metal seam, usually at offices, suites, and interiors that match surrounding millwork | Finish condition, edge preparation, core type if known, and whether the hardware manufacturer specifies through-bolts |
| Aluminum storefront | Narrow vertical stiles, large glass panels, and slim extruded framing at retail entrances and lobbies | Backset, stile reinforcement, and the wire path for any electrified hardware, since glass sits directly beside every cut |
| All-glass or automatic | A tempered glass leaf held by patch fittings or rails, or any door driven by a powered operator overhead | The specific glass or operator system in use; these openings accept only hardware approved for that system |
System view
An opening is a system, not a lock.
The door material is one part of a larger assembly. Each component below affects how the others behave, which is why a sound hardware decision starts with the whole opening rather than the product box.
Hinges or pivots
They hang and align the door leaf. Worn or loosely fastened hanging hardware shifts the latch edge, and on a heavy commercial door the fastening depends entirely on what the door and frame material can hold.
Closer
It controls the closing cycle. A closer can only manage a door that swings freely; it cannot correct binding caused by the door, the frame, or the hinges.
Lock or latch
It secures the door at the lock edge. The preparation it needs, whether a bored hole, a mortise pocket, or a glass fitting, is dictated by the door construction.
Strike and frame
They receive and align the latch. Frame material and reinforcement determine which strikes, including electric strikes, the opening can support.
Threshold
It protects and finishes the bottom of the opening and affects clearance, weather performance, and accessibility at the sill.
Door and glazing
The material, the existing prep, and any glass determine what can be cut, what must be through-bolted, and what cannot be modified in the field at all.
Hollow metal
In a hollow metal door, the skin is not the structure.
A typical hollow metal door is two steel face skins bonded around a lightweight core, completed by top and bottom channels and edge construction. A common core is honeycomb: a bonded lattice that keeps the faces flat and stable. The honeycomb stabilizes the skins, but it is not reinforcement, and it cannot carry hardware loads.
Loads from locks, hinges, closers, and exit devices are carried by reinforcement plates and channels placed inside the door at specific locations during manufacture. Screws driven only into the face skin or the core work loose under daily traffic, which is a frequent root cause when hardware sags, rattles, or pulls away from the door.
Honeycomb is only one construction. Steel-stiffened, polystyrene, polyurethane, and mineral cores also exist, and core, gauge, and reinforcement vary by series, rating, and manufacturer. Expect a qualified installer to confirm the door's actual reinforcement, using markings, manufacturer information, or the existing prep, before drilling anything.
Material behavior
Why does the same lock behave differently on each door material?
The lock model does not change, but the substrate holding it does. The differences show up in fastening, alignment, and how forgiving the door is of an imperfect cut.
Hollow metal
Fasteners hold only where reinforcement backs them. Gauge, reinforcement locations, and any fire label control which preps are possible, and the existing prep often decides what replacement hardware fits without new cutting.
Commercial wood
The finish and edge are easy to damage. The same installation calls for sharp tooling, pilot holes, correct edge preparation, and through-bolts where the hardware manufacturer specifies them, because wood fibers crush and split under overdriven fasteners.
Aluminum storefront
Narrow stiles leave inches, not feet, of working room, with tempered glass immediately beside the cut. Backset, internal reinforcement, and the wire path for electrified hardware must be verified before the first hole is drilled.
All-glass and automatic
There is no field prep. Hardware attaches through patch fittings, rails, and operator components engineered for the specific system, so the product selection effectively is the installation plan.
Approved hardware only
When is an opening approved-hardware-only territory?
All-glass commercial doors use tempered glass, and tempered glass cannot be drilled, ground, or notched after tempering; attempting it destroys the leaf. Hardware changes on these doors happen through rails, patch fittings, and header hardware approved for the specific glass system, installed to the manufacturer's instructions, or by replacing the leaf with one fabricated to the required prep.
Automatic doors add a powered operator with sensors, force settings, and timing that belong to a listed assembly. Hardware or control changes on an automatic opening should stay with people qualified on that operator, working from its documentation, so the door continues to behave as its listing intends.
The same stop-and-verify posture applies to fire-rated openings and to doors with exit hardware, maglocks, or delayed egress. Approved plans, product listings, manufacturer instructions, adopted code, and the authority having jurisdiction (AHJ) control what may change on those openings. A guide like this one provides general planning information, not project-specific direction.
Owner checklist
What should a property team record before approving door work?
A short photo-and-notes record prevents wrong-hardware orders and repeat visits. Before signing off on a hardware change, capture the following:
- The full opening, photographed straight on from both sides
- The door edge, showing thickness, bevel, and any existing preps
- The frame at the strike and hinge locations, including any visible reinforcement or anchors
- Every label on the door and frame, photographed while legible and before any work begins
- The door material, whether hollow metal, wood, aluminum storefront, or glass, and how it was identified
- Existing hardware makes and models from both sides of the door
- Anything unresolved: unknown reinforcement, illegible labels, glass near a planned cut, or an open fire-rating or egress question
Common questions
Questions about commercial door types
How can I tell if a door is hollow metal or wood?
Tap it and check the edge. Hollow metal sounds metallic and shows a seam along the edge where the two faces meet; wood shows grain or a solid painted edge without a seam. A magnet is another quick test. Confirm at the edge and hinge mortises rather than the face, since some wood doors carry face laminates that read as paint.
Why did screws pull out of my steel door?
Most often the fasteners were driven into the face skin or the core instead of internal reinforcement. Honeycomb and foam cores stabilize the skins but carry no hardware load, so screws set in them loosen under daily use. The durable repair fastens hardware at reinforced locations per the manufacturer's information, not larger screws in the same holes.
Can the lock from an office door be used on a storefront door?
Usually not directly. Aluminum storefront doors have narrow stiles that take narrow-stile hardware with shallow backsets, and many use deadlatches or exit devices designed for that stile width. A standard cylindrical lock prepared for a wood or hollow metal door often will not fit the stile or align correctly with the frame.
Is it ever acceptable to drill an all-glass door for new hardware?
No. Tempered glass cannot be drilled, ground, or modified after tempering, and attempting it shatters the leaf. Hardware changes on all-glass doors are made through rails, patch fittings, and header hardware approved for that glass system, or by ordering a replacement leaf fabricated with the required prep.
Does the door type matter when adding access control?
Yes. The door and frame material decide where an electric strike, electrified lock, or reader wiring can live. Hollow metal openings often carry frame-mounted strikes at reinforced locations, storefront doors need narrow-stile or header solutions, and glass doors take only system-approved hardware. Identifying the material is the first step of any access control plan.
Sources and further reading
These references support the general technical guidance. The right answer for a specific opening still depends on the property and the authorities responsible for the project.