Technical Foundation
What Is a Door Hinge?
A door hinge is sized primarily by three factors: leaf height and width (matched to the door thickness and stile width), gauge/thickness of the hinge metal (which sets load capacity), and bearing type — plain bearing for light-duty, low-frequency doors, versus ball bearing for heavier doors or high-cycle commercial applications where reduced friction extends hinge life. Continuous (piano) hinges run the full length of the door edge, distributing weight evenly and eliminating the point-loading that causes standard butt hinges to sag over time on wide or heavy doors.
Material selection balances corrosion resistance against cost and finish: standard steel hinges are common for interior use, stainless steel (304 or 316) is specified for exterior, marine or corrosive environments, and solid brass offers a decorative finish with good corrosion resistance for lighter-duty applications. Commercial and fire-rated openings require hinges tested and listed to ANSI/BHMA A156.1 and, for fire doors, UL 10C/NFPA 80, since a non-rated hinge can void the door assembly's fire rating regardless of the door and frame themselves being rated.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Hinge Size | Height x width of the leaf, e.g. 4.5" x 4.5" | Must match door thickness and stile width — undersized hinges overstress the frame |
| Bearing Type | Plain bearing vs. ball bearing | Ball bearing reduces friction and wear on heavy or high-cycle commercial doors |
| Material/Finish | Steel, 304/316 stainless, solid brass | Stainless and brass resist corrosion in exterior, marine or high-humidity settings |
| Weight Rating | Standard weight vs. heavy weight gauge | Heavier doors need thicker-gauge hinges and often more hinges per leaf |
| Fire Rating | UL 10C / NFPA 80 listed hinges | Required on rated door assemblies — an unlisted hinge can void the assembly's fire rating |
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Applications
Where Door Hinges Get Used
Door hinges are specified according to door weight, cycle frequency, and the corrosion or fire-rating demands of the opening.
Commercial & Institutional Buildings
Ball bearing butt hinges and continuous hinges specified for high-frequency doors in offices, schools and healthcare facilities.
Fire-Rated Door Assemblies
UL-listed hinges installed on rated door and frame assemblies to preserve the fire rating of the opening.
Industrial & Warehouse Doors
Heavy-weight steel hinges and continuous piano hinges supporting oversized or high-cycle equipment access doors.
Marine & Exterior Applications
316 stainless steel hinges specified where salt spray or repeated moisture exposure would corrode standard steel.
Cabinetry & Millwork
Concealed and decorative hinges specified for furniture, cabinets and architectural millwork applications.
Residential Construction
Standard weight steel and brass butt hinges for interior and exterior residential doors.
FAQ
Door Hinges Questions, Answered
How do I choose between a plain bearing and a ball bearing hinge?
Plain bearing hinges are adequate for light-duty, low-frequency doors like residential interior doors. Ball bearing hinges use a bearing race between the knuckles to reduce friction and wear, and are specified for heavier doors or commercial openings that cycle frequently — the reduced friction extends hinge life and keeps the door swinging smoothly under repeated use.
What size hinge do I need for my door?
Hinge size is matched to door thickness and weight: standard interior doors typically use 3.5" hinges, while heavier or thicker commercial doors use 4" to 4.5" hinges. Door weight and width also determine how many hinges are needed per leaf — most doors use three, with heavier or taller doors sometimes specifying four.
When is a continuous (piano) hinge better than standard butt hinges?
A continuous hinge runs the full height of the door edge, distributing weight evenly along its length rather than concentrating load at two or three points as butt hinges do. This makes it the standard choice for wide, heavy, or high-cycle doors — like gymnasium, stairwell or equipment access doors — where point-loaded butt hinges would sag or wear out over time.
Do fire-rated doors require special hinges?
Yes. Fire-rated door assemblies require hinges tested and listed to UL 10C and NFPA 80, since the entire assembly — door, frame and hardware — must maintain its rating as a system. Installing a non-rated hinge on a rated door can void the assembly's fire rating even though the door and frame are individually rated.
What material should I choose for exterior or marine-use hinges?
304 stainless steel handles most exterior and high-humidity applications, but 316 stainless is recommended for marine or coastal environments with direct salt spray exposure, since it contains molybdenum that significantly improves resistance to chloride-induced pitting corrosion compared to 304.
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