Hardware
Continuous Hinges
By the Div08 Consulting team · Updated
A continuous hinge runs the full height of the door instead of using three or four separate butt hinges. It spreads the door's weight along the frame, which prevents sag and screw pull-out on heavy or abused doors. The two main types are geared aluminum and stainless steel pin and barrel. They are covered by ANSI/BHMA A156.26.
Why specify a continuous hinge
Butt hinges concentrate the load of the door at a few points. On doors that are heavy, wide, or abused, those points wear, the screws loosen, and the door sags until it drags or stops latching. A continuous hinge spreads the load along the full edge.
- High-traffic entrances: schools, transit, retail, arenas.
- Doors that get abused: gyms, locker rooms, back-of-house, corrections.
- Heavy or wide doors where butt hinges would be oversized.
- Retrofits where existing hinge preps are worn out (some continuous hinges cover the old preps).
- Doors where pinched fingers at the hinge edge are a concern (some models include a finger guard).
Geared aluminum vs pin and barrel
| Feature | Geared aluminum | Pin and barrel (stainless steel) |
|---|---|---|
| How it works | Two extruded leaves with interlocking gears under a cover channel | Alternating knuckles on a continuous pin, like a heavy piano hinge |
| Strength | Very durable in high traffic; load spread by the gear | Strong; steel construction tolerates abuse |
| Mounting | Full surface, half surface, or concealed (full mortise) versions | Usually full mortise or surface |
| Look | Visible cap on the hinge edge | Slim, traditional look on the edge |
| Typical use | Storefront, high-traffic aluminum and hollow metal doors | Hollow metal doors, healthcare, corrections, wet areas |
Both types come in standard and heavy-duty weights. Manufacturers publish door weight and width limits for each model, so match the hinge to the door, not just to the opening type.
Continuous hinges on fire-rated doors
Continuous hinges are used on labeled doors, but only models listed for the rating and door type. Some geared aluminum hinges are listed for fire-rated doors with a specific maximum rating, and some rely on features like fire pins. Pin and barrel stainless steel hinges are commonly listed as well.
- Confirm the hinge listing covers the door's rating and size.
- Confirm the door and frame are prepared or reinforced for that hinge.
- Do not swap a listed continuous hinge for an unlisted one at submittal or in the field.
Read more in fire-rated doors.
Details that cause field problems
- Length: the hinge is typically about an inch shorter than the door. Check the manufacturer's sizing for the door height.
- Reinforcement: hollow metal doors and frames need reinforcement or through-bolting where the hinge fastens. Coordinate with the frame supplier early.
- Clearance: some hinge types change the clearance at the hinge edge and the throw of the door. Check how far the door opens if it has to clear trim or meet ADA clear width.
- Electrified versions: continuous hinges can carry power transfer for electrified locks and exit devices. This must be in the hardware set so the frame gets the right prep. See electric strike vs maglock.
- Handing: some continuous hinges are handed. See door handing.
Spec tip
when you switch a set from butt hinges to a continuous hinge, tell the door and frame supplier at the same time. A frame prepped for butts and a hinge that needs full-height reinforcement is the most common continuous-hinge mistake on a submittal.
Continuous hinge or ball bearing butts?
Heavy weight ball bearing hinges are fine for most commercial doors, including doors with closers. Move to a continuous hinge when traffic, door weight, abuse, or a history of sagging doors justifies it. Continuous hinges usually cost more per opening, so the decision should be made deliberately, door type by door type, in the door hardware sets.
Frequently asked questions
What is a continuous hinge used for?
High-traffic or heavy doors where butt hinges would wear and sag. It spreads the weight of the door along the full height of the frame.
Is a geared continuous hinge better than pin and barrel?
Neither is better in every case. Geared aluminum is common on storefront and high-traffic doors; stainless pin and barrel is common on hollow metal, healthcare and abusive applications.
Can a continuous hinge be used on a fire door?
Yes, if the specific model is listed for the door's fire rating and type. Check the listing before specifying or substituting.
How long should a continuous hinge be?
Typically slightly shorter than the door, often about an inch. Follow the manufacturer's sizing chart for the door height.
General guidance only. Code requirements depend on the edition your jurisdiction has adopted and on the listing of each fire-rated assembly; confirm with the authority having jurisdiction. Published by Div08 Consulting (John Voll, owner).