Door Butt Hinge vs. Door Rough Openings
Comparing 2 standards across 14 specifications. 14 key differences identified.
Standard door butt hinges under ANSI/BHMA A156.1 standardize hinge leaf dimensions, corner radius mortises, leaf thickness, and screw hole template patterns. Sized in 3.5×3.5" for 1-3/8" residential interior doors, 4.0×4.0" for 1-3/4" solid doors, and 4.5×4.5" for commercial ball-bearing fire doors, hinges maintain standardized spacing along door edges.
Door rough openings are standardized framing openings in wood and steel stud walls engineered to accept pre-hung door frames, shims, and finished jambs. Under standard architectural guidelines, rough opening width is calculated as Nominal Door Width + 2.0 inches, and rough opening height is calculated as Nominal Door Height + 2.5 inches, with standard 36×80" doors accommodating ADA accessibility.
Specification Comparison Table
14 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
ANSI/BHMA A156.1 / SDI-100 / NFPA 80 | WDMA I.S. 1-A / ANSI A250.8 / ADA Standards Section 404 |
|
3.5" Residential Hinge
|
3.5 × 3.5" (89 × 89 mm) | Leaf: 0.085" (2.2 mm) | 1-3/8" hollow-core doors | — |
|
4.0" Heavy Residential Hinge
|
4.0 × 4.0" (102 × 102 mm) | Leaf: 0.097" (2.5 mm) | 1-3/4" solid-core entry doors | — |
|
4.5" Commercial Hinge
|
4.5 × 4.5" (114 × 114 mm) | Leaf: 0.134"–0.180" | Ball-bearing fire doors | — |
|
Corner Radius Types
|
Square corner | 1/4" radius (dime size) | 5/8" radius (quarter size) | — |
|
Top Hinge Standard Spacing
|
5.0 inches (127 mm) down from top edge of door to top of hinge | — |
|
Bottom Hinge Standard Spacing
|
10.0 inches (254 mm) up from finished floor to bottom of hinge | — |
|
Rough Opening Width Formula
|
— | Nominal Door Width + 2.0 inches (51 mm) |
|
Rough Opening Height Formula
|
— | Nominal Door Height + 2.5 inches (64 mm) |
|
30×80" Bedroom Door (2/6 × 6/8)
|
— | Rough Opening: 32.0 × 82.5 inches (813 × 2096 mm) |
|
32×80" Standard Entry (2/8 × 6/8)
|
— | Rough Opening: 34.0 × 82.5 inches (864 × 2096 mm) |
|
36×80" ADA Entry (3/0 × 6/8)
|
— | Rough Opening: 38.0 × 82.5 inches (965 × 2096 mm) |
|
Standard 2×4 Wall Jamb Depth
|
— | 4-9/16 inches (116 mm) = 3.5" stud + two 1/2" drywall layers |
|
Standard 2×6 Wall Jamb Depth
|
— | 6-9/16 inches (167 mm) = 5.5" stud + two 1/2" drywall layers |