A swing clear hinge uses an offset barrel to swing the door completely clear of the door opening when fully open, maximizing the clear passage width for wheelchair users and other mobility-assisted individuals. Where a standard hinge leaves the open door protruding into the opening by approximately 2 inches, a swing clear hinge eliminates this intrusion — recovering that 2 inches of usable passage width. Swing clear hinges are a key tool for achieving ADA accessibility compliance on existing doors without widening the structural opening.
| Hinge Type | Offset-barrel butt hinge for full clear opening |
|---|---|
| Also Known As | Wide throw hinge, offset hinge, clearance hinge |
| Clear Width Gain | Approximately 2 inches vs. standard butt hinge |
| Primary Use Case | ADA accessibility compliance, wheelchair passage |
| ADA Standard | ADA Standards for Accessible Design Section 404.2.3 (32" minimum clear) |
| Common Sizes | 3-1/2" (residential), 4-1/2" (commercial standard), 5" (heavy-duty) |
| Weight Ratings | Up to 150–200 lbs (5" heavy-duty) |
| Self-Closing Version | Available (spring or hydraulic, UL-listed for fire-rated use) |
| Frame Mortise | Wider than standard — verify manufacturer dimensions |
| Last Updated | 2026-03-02 |
To understand swing clear hinges, it is necessary to first understand why standard hinges reduce clear passage width. On a door with standard butt hinges, the pivot axis (the hinge pin centerline) is positioned at the door edge — the same plane as the door stop on the frame. When the door opens to 90 degrees, the door leaf rotates around this pivot axis but never fully clears the door opening: the door thickness itself protrudes into the passage, reducing the clear width by approximately the door thickness (typically 1-3/4 inches for commercial hollow metal doors).
Swing clear hinges solve this problem through an offset barrel design. The barrel of a swing clear hinge is not positioned at the door edge — it is offset toward the room side of the door. This offset causes the door to swing on an arc that moves the door completely clear of the opening as it approaches 90 degrees. By the time the door reaches full open, the entire door leaf has moved to the side of the opening, leaving the full opening width unobstructed.
The offset geometry requires a wider frame-side hinge leaf to accommodate the barrel offset. The frame leaf is typically 1 to 1-1/2 inches wider than a standard hinge leaf of the same nominal size. This extra width allows the barrel to project the required offset distance while the frame leaf still sits flush in its mortise. The door-side leaf is standard width.
The ADA Standards for Accessible Design, Section 404.2.3, require a minimum clear width of 32 inches for accessible door openings, measured between the face of the open door (at 90 degrees) and the opposite door stop. For wider openings, 36 inches clear is required in certain circulation paths. ICC A117.1 references the same dimensions.
With standard butt hinges, the clear width at 90 degrees open is approximately equal to the door opening width minus the door thickness. For a 1-3/4 inch thick commercial door in a 34-inch opening:
With swing clear hinges, the door swings completely out of the opening. At 90 degrees open, the door face is flush with or slightly beyond the frame face — no part of the door protrudes into the passage. For the same 34-inch opening:
The approximately 2-inch gain in clear width is the primary reason swing clear hinges are specified on accessible routes. This gain allows a 34-inch or even 32-inch nominal door opening to meet ADA clear width requirements without structural modification to the wall or frame opening — a significant cost advantage in retrofit situations.
Swing clear hinges are not universally mandated by ADA — they are a solution used when a standard hinge configuration falls short of the required clear width. Common scenarios where they are specified include:
Swing clear hinges are available with integrated self-closing mechanisms, combining the clear-opening offset geometry with automatic door closing. This combination is particularly valuable on fire-rated doors that also serve accessible routes, where both NFPA 80 self-closing compliance and ADA clear width compliance must be achieved simultaneously.
Self-closing swing clear hinges with a torsion spring mechanism provide automatic closing force within the hinge barrel. The spring tension is adjustable using the same notch-position system as standard spring hinges. Spring-type self-closing swing clear hinges are appropriate for fire-rated accessible doors where ADA closing-speed compliance is not required (non-ADA fire stairwell doors on accessible routes, for example) or where the closing speed can be managed with sufficiently low spring tension.
Hydraulic self-closing swing clear hinges integrate a fluid dampening circuit in addition to the offset barrel design. The hydraulic mechanism provides adjustable, controlled closing speed that can be tuned to meet ADA requirements (minimum 1.5 seconds from 70 degrees to 3 inches from latch, maximum 5 lbf operating force on interior doors). These hinges represent the most complete solution for accessible fire doors — a single hinge provides offset clear opening, self-closing function, and ADA-compliant controlled closing speed.
Self-closing swing clear hinges used on fire-rated door assemblies must carry a UL listing appropriate for the fire-rating duration of the assembly. As with all fire door hardware, verify that the specific hinge model is listed for the required duration — 20-minute, 45-minute, 60-minute, 90-minute, or 3-hour. The UL listing applies to the complete hinge assembly including the offset barrel, self-closing mechanism, and all fasteners. Using an unlisted hinge on a fire-rated assembly invalidates the assembly's fire rating.
The 3-1/2 inch swing clear hinge is intended for residential applications — lighter interior doors, accessible bathroom doors in private residences, and light-duty interior commercial doors. Weight ratings for 3-1/2 inch swing clear hinges are typically in the range of 40 to 60 lbs per leaf. Two hinges per door is standard for residential applications. The 3-1/2 inch size accommodates standard residential hollow-core and solid-core wood doors.
The 4-1/2 inch swing clear hinge is the standard commercial size, appropriate for hollow metal and solid wood commercial doors up to approximately 36 inches wide and weighing up to 100–120 lbs. This is the most commonly specified size for ADA-accessible doors in commercial renovations and new construction. Three hinges per door is standard for full-height commercial doors (84 to 96 inches). The 4-1/2 inch size is compatible with standard commercial mortise dimensions on the door-side leaf; the frame-side leaf requires a wider mortise as noted below.
The 5 inch swing clear hinge handles heavy commercial doors — wide doors (36 to 42 inches), dense door materials, and applications with sustained heavy use. Weight ratings for 5 inch models range from 150 to 200 lbs or more depending on the manufacturer. Heavy-duty swing clear hinges are commonly specified in healthcare facilities for wide accessible corridor doors, oversized patient room doors requiring both clear width and heavy-duty durability, and institutional accessible entries with high traffic and heavy door weights.
| Size | Typical Application | Door Weight Range | Min. Hinges Per Door |
|---|---|---|---|
| 3-1/2 inch | Residential, light interior | Up to ~60 lbs | 2 |
| 4-1/2 inch | Standard commercial | Up to ~120 lbs | 3 |
| 5 inch | Heavy commercial / healthcare | Up to ~200 lbs | 3 (4 for very heavy) |
Healthcare facilities are among the most common environments for swing clear hinge specification. Accessible patient rooms must provide clear passage for wheelchairs, hospital beds, and medical equipment — all of which require the maximum available clear width. Patient room doorways in older hospital wings are frequently 34 to 36 inches nominal; swing clear hinges allow these openings to provide full ADA-compliant clear width without structural renovation. In new healthcare construction, swing clear hinges on accessible routes maximize clear passage even when door opening dimensions already meet ADA minimums, reducing tight clearance for wide medical equipment like stretchers and IV stands.
Accessible restroom doors present the clearest case for swing clear hinges. ADA requires that accessible toilet room doors provide 32 inches of clear width. In existing restrooms, doorway widths are often at or barely above minimum, and a standard hinge reduces clear width below the requirement. Swing clear hinges are the standard retrofit solution for existing accessible restroom doors that fail clear width measurements during ADA compliance audits. Single-leaf accessible restroom doors in commercial buildings are typically specified with two or three 4-1/2 inch swing clear hinges.
Accessible residential units and hotel accessible rooms require accessible routes throughout the unit, including all doors on the accessible path. Swing clear hinges are frequently specified on apartment and hotel room bathroom doors, which tend to be narrower than corridor doors and most susceptible to clear width shortfalls. Hotels undergoing ADA retrofits commonly replace existing bathroom door hinges with swing clear versions as a low-cost compliance measure that avoids the major disruption and expense of widening doorways.
Schools are required to provide accessible routes throughout accessible portions of the building under ADA Title II (public entities) and the Architectural Barriers Act. Accessible classroom doors, accessible restroom doors, and doors on required accessible routes in schools are common swing clear hinge applications. In older school buildings where corridor door widths were built to minimum code dimensions of an earlier era, swing clear hinges on accessible route doors provide the compliance margin needed without building alterations.
Swing clear hinges require different installation considerations than standard butt hinges, primarily because of the offset barrel geometry.
The most significant installation difference is the frame-side leaf width. A standard 4-1/2 inch butt hinge has equal-width leaves (typically 4-1/2 x 4-1/2 inches open). A swing clear hinge of the same nominal size has a wider frame leaf — typically 5 inches or more — to accommodate the barrel offset distance. When retrofitting swing clear hinges on an existing door, the frame-side mortise must be re-cut to the wider dimension. The door-side mortise typically remains the same width as the original hinge, which simplifies the retrofit on the door side.
The offset barrel of a swing clear hinge requires that there be adequate clearance between the barrel and the door frame stop. If the door is installed too close to the frame stop, the barrel may contact the stop during opening and prevent the door from reaching 90 degrees. Verify the required clearance dimension from the manufacturer's installation instructions and confirm that the door-to-stop gap in the existing installation meets this requirement before ordering swing clear hinges for a retrofit project.
Unlike standard butt hinges, which are reversible (the same hinge works on both handing configurations because the barrel is centered), swing clear hinges are handed — the offset barrel is oriented to one side, and a right-hand door requires a different hinge than a left-hand door. Always specify the correct handing when ordering swing clear hinges. Handing convention: stand in the doorway facing the door from the pull side. If the hinges are on your right, the door is right-hand. If on your left, it is left-hand. Verify handing before ordering — reversing a swing clear hinge does not produce the correct geometry.
| Characteristic | Swing Clear Hinge | Standard Butt Hinge |
|---|---|---|
| Clear Width at 90° Open | Full opening width (door clears passage) | Opening width minus door thickness (~2" less) |
| ADA Clear Width | Recovers ~2" — enables compliance on narrower openings | May fall short on 32"–34" nominal openings |
| Barrel Position | Offset from door edge (wide-throw geometry) | At door edge (standard geometry) |
| Handing | Handed (RH or LH — not reversible) | Reversible (same hinge for both hands) |
| Frame Mortise Width | Wider than standard (offset leaf) | Standard width |
| Self-Closing Available | Yes (spring or hydraulic) | Yes (spring or hydraulic) |
| Fire-Rated Available | Yes (UL-listed models) | Yes (UL-listed models) |
| Cost | Higher (specialized geometry) | Lower (standard product) |
The ADA Standards for Accessible Design and ICC A117.1 establish the framework within which swing clear hinges provide value. Understanding the specific code requirements helps architects and specifiers determine when swing clear hinges are the appropriate solution:
Section 404.2.3 of the ADA Standards requires a minimum 32-inch clear width at accessible door openings, measured at the narrowest point between the face of the open door (at 90 degrees) and the face of the opposite stop. For certain accessible routes — including those in elevator lobbies and at the accessible entrance to a building — 36 inches clear is recommended practice. The 32-inch minimum is measured with the door in the 90-degree open position; a partially open door position does not satisfy the measurement requirement.
ADA Section 404.2.4 requires maneuvering clearance on both sides of accessible doors — specific floor areas clear of obstruction that allow a wheelchair user to approach and operate the door. While swing clear hinges address the clear width of the door opening, architects must also ensure that the required maneuvering clearance dimensions are met at the wall area adjacent to the door. These two requirements — clear width and maneuvering clearance — work together to define a fully accessible door assembly.
ADA Section 309.4 and Section 404.2.9 limit the force required to open interior accessible doors to a maximum of 5 lbf. This requirement applies to the operating force required to push or pull the door open, and must be met regardless of hinge type. Self-closing swing clear hinges with hydraulic dampening must be adjusted so that the closing force does not increase the opening force above this limit. The adjustment relationship between closing speed and opening force is the same as for standard self-closing hinges — see the Closing Speed Adjustment Guide for detailed adjustment procedures.
Q: How much clear width does a swing clear hinge add compared to a standard hinge?
A: A swing clear hinge typically recovers approximately 2 inches of clear passage width. With a standard hinge, the open door protrudes into the opening by approximately the door thickness (typically 1-3/4 to 2 inches), reducing clear width below the nominal opening dimension. Swing clear hinges offset the barrel so that at full open, the door swings completely clear of the opening, providing clear width equal to the full opening minus only the door frame stop depth.
Q: Are swing clear hinges required for ADA compliance?
A: Swing clear hinges are not universally required, but they are a common solution when a door on an accessible route falls short of the 32-inch minimum clear width requirement (ADA Section 404.2.3) with standard hinges. When a standard hinge configuration results in less than 32 inches of clear passage width, installing swing clear hinges is a cost-effective retrofit that often achieves compliance without modifying the structural door opening.
Q: What sizes are swing clear hinges available in?
A: Swing clear hinges are commercially available in 3-1/2 inch (residential), 4-1/2 inch (commercial standard), and 5 inch (heavy-duty commercial) sizes. Weight ratings increase with size: 3-1/2 inch models handle up to approximately 60 lbs, 4-1/2 inch models up to 100–120 lbs, and 5 inch models up to 150–200 lbs. The appropriate size depends on door weight, width, and traffic level.
Q: Are swing clear hinges available in self-closing versions?
A: Yes. Self-closing swing clear hinges are available with spring or hydraulic mechanisms, and UL-listed fire-rated versions are available for fire door assemblies. Hydraulic self-closing swing clear hinges are the preferred solution for fire-rated accessible doors requiring both clear-opening geometry and ADA-compliant controlled closing speed.
Q: How is installation of a swing clear hinge different from a standard hinge?
A: The primary differences are: (1) swing clear hinges are handed — right-hand and left-hand versions are required for different door configurations; (2) the frame-side leaf is wider than a standard hinge of the same nominal size and requires a wider frame mortise; (3) barrel clearance from the door frame stop must be verified before installation — insufficient stop clearance prevents the door from reaching full open. On the door side, the mortise dimensions are typically the same as a standard hinge of the same nominal size.
Self-closing, swing clear, UL-listed — full ADA compliance in one hinge