A spring hinge is a door hinge that incorporates a coiled torsion spring inside the barrel to automatically return the door to its closed position after each use. Spring hinges are among the oldest and simplest forms of self-closing hardware, widely used in both residential and commercial applications. NFPA 80 requires a minimum of two spring hinges per fire-rated door. ANSI/BHMA A156.17 Grade 1 is the governing performance standard for commercial installations.
| Hinge Type | Spring-loaded self-closing butt hinge |
|---|---|
| Mechanism | Coiled torsion spring inside barrel |
| Acting Types | Single-acting, double-acting |
| Key Standard | ANSI/BHMA A156.17 (Grade 1, 2, or 3) |
| Fire Code Requirement | Minimum 2 per fire-rated door (NFPA 80) |
| Common Sizes | 3-1/2" (residential), 4" (light commercial), 4-1/2" (commercial) |
| ADA Compliance | Spring-only type does not reliably meet ADA closing-speed; hydraulic preferred |
| Cycle Rating | Grade 1 = 1,000,000 cycles; Grade 2 = 500,000; Grade 3 = residential |
| Tension Adjustment | 4–11 preset notch positions (varies by manufacturer) |
| Last Updated | 2026-03-02 |
The functional core of a spring hinge is a torsion spring — a tightly wound coil of high-tensile steel — housed concentrically within the hinge barrel. When the door is pushed open, the leaf rotation twists the spring, storing mechanical potential energy. When the door is released, the spring uncoils and exerts a rotational force on the barrel, driving the door back to its closed and latched position.
Unlike hydraulic self-closing hinges, spring hinges have no fluid dampening circuit. The closing speed is determined entirely by spring tension and the physical resistance of the door (weight, friction, air pressure differential). This means closing behavior is less predictable: a heavily tensioned spring on a light door will close very quickly, potentially slamming. Conversely, insufficient tension on a heavy door may fail to reliably latch it. This trade-off between closing force and closing speed is the central design constraint of the spring hinge.
Modern spring hinges use a replaceable spring cartridge that threads or clips into the hinge barrel. The cartridge design allows spring replacement without removing the hinge from the door, simplifying maintenance on high-cycle installations. The cartridge also contains the tension adjustment mechanism — typically a series of notches or slots that lock the spring at predetermined tension levels. The number of available tension positions varies by manufacturer, with commercial-grade hinges typically offering 8 to 11 positions.
Tension adjustment is performed by partially withdrawing the hinge pin, accessing the spring cartridge at the top or bottom of the barrel, and rotating the cartridge to a higher or lower tension position using a tension tool (supplied by the manufacturer) or a stiff steel pin. The cartridge is then locked by re-seating the hinge pin. Most manufacturers label tension positions numerically or with directional arrows. The correct tension setting is the lowest value at which the door reliably closes and latches under normal operating conditions — higher tension than necessary accelerates spring fatigue and can make the door difficult to open, potentially creating accessibility problems.
Single-acting spring hinges allow the door to swing in one direction only. The spring resists opening in the intended direction and returns the door to the closed position when released. Standard single-acting spring hinges are configured for doors that swing away from a fixed frame — the most common configuration in residential and commercial corridors, stairwells, and egress paths. The door frame acts as the physical stop that defines the "closed" position, and the spring holds the door against the frame. Single-acting spring hinges are the appropriate choice wherever doors are required to swing in one direction only, including fire-rated stairwell and corridor doors under NFPA 80.
Double-acting spring hinges contain two opposing spring cartridges — one resisting each direction of swing — allowing the door to swing fully in either direction and return to a centered, vertical closed position from both sides. The door has no fixed frame stop; instead, the spring force of both cartridges defines the closed position as the point of equilibrium between opposing forces. Double-acting hinges are used on café doors, restaurant kitchen pass-throughs, hospital ward doors that require hands-free access from both sides, and warehouse divider doors where bi-directional traffic flow is required. They are not appropriate for fire-rated door assemblies, which require doors to close against a positive stop.
| Feature | Single-Acting | Double-Acting |
|---|---|---|
| Swing Direction | One direction only | Both directions |
| Spring Count | One spring cartridge | Two opposing cartridges |
| Closed Position | Against door frame stop | Vertical center (no stop required) |
| Fire Door Use | Yes (UL-listed models) | No |
| Common Applications | Corridor, stairwell, egress doors | Café, kitchen, hospital ward doors |
ANSI/BHMA A156.17 is the American National Standard that establishes performance classifications for self-closing hinges, including spring hinges. The standard defines three grades based on cycle durability and closing force requirements:
Grade 1 is the highest performance classification and is required for all commercial and fire-rated door applications. ANSI/BHMA A156.17 Grade 1 spring hinges must complete a minimum of 1,000,000 open-close cycles without failure, while maintaining closing force within specified parameters throughout the test. Grade 1 hinges are tested under the full range of spring tension settings and at both elevated and reduced temperatures to simulate real-world service conditions. Fire-rated doors under NFPA 80 must use Grade 1 self-closing hinges that are UL-listed for the fire-rating duration of the assembly.
Grade 2 spring hinges are rated for a minimum of 500,000 cycles. They are suitable for light commercial applications with moderate traffic — small offices, retail spaces, and interior doors in low-occupancy buildings. Grade 2 hinges are not appropriate for fire-rated doors in high-occupancy commercial buildings or any installation requiring Grade 1 performance under NFPA 80.
Grade 3 is the residential classification, rated for lower cycle counts and lighter duty service. Residential spring hinges are appropriate for homes, apartments, and light-duty interior applications where traffic is low and fire-rated compliance is not required. They are typically offered in smaller sizes (3-1/2 inch) and fewer finish options than commercial grades.
Spring hinge sizing follows the same conventions as standard butt hinges, with the hinge size specified by the height of each leaf. The appropriate size depends on door height, width, and weight:
The 3-1/2 inch spring hinge is the standard residential size, appropriate for interior residential doors up to approximately 36 inches wide and weighing no more than 50 pounds. Residential spring hinges in this size are available in Grade 3 and are commonly found in homes, apartments, and light-duty interior applications. They are not suitable for commercial or fire-rated door applications.
The 4 inch spring hinge bridges residential and light commercial applications. It is suitable for interior commercial doors up to 36 inches wide and 80 inches tall, with weights up to approximately 70 pounds per hinge pair. Grade 2 and Grade 1 versions are available in 4 inch. This size is common in small offices, retail backroom doors, and residential applications requiring a heavier-duty hinge.
The 4-1/2 inch spring hinge is the commercial standard, suitable for full-size commercial doors up to 36 to 42 inches wide and 84 to 96 inches tall, with weight ratings typically up to 120–140 pounds per pair depending on the number of hinges installed. Grade 1 4-1/2 inch spring hinges are the most common choice for corridor doors, stairwell doors, and fire-rated doors in commercial buildings. Most commercial door hardware schedules specify 4-1/2 inch hinges as the default commercial size.
The number of spring hinges required per door depends on door height and weight:
NFPA 80, Standard for Fire Doors and Other Opening Protectives, is the primary model code governing fire-rated door assemblies in the United States. Spring hinges are among the most common methods of providing the self-closing function required by NFPA 80 on fire-rated doors.
NFPA 80 Section 4.8.4 requires that fire door assemblies be equipped with a listed self-closing device. For spring hinge-based assemblies, the standard requires a minimum of two spring hinges per door leaf. The two-hinge minimum applies regardless of door height; for doors exceeding 60 inches in height, three hinges are standard practice, consistent with the general guideline of one hinge per 30 inches of door height.
Spring hinges used on fire-rated doors must carry a UL listing appropriate for the fire-rating duration of the assembly. UL listings are available in 20-minute, 45-minute, 60-minute, 90-minute, and 3-hour ratings. The hinge must be listed for the same duration as the door assembly — a spring hinge listed for 60 minutes cannot be used on a 90-minute rated assembly. Always verify that the hinge's UL listing matches the fire rating stamped on the door assembly label.
NFPA 80 requires that self-closing fire doors latch positively upon closing — the door must fully engage the latch bolt in the strike plate. Spring tension must be sufficient to overcome any air pressure differential, door weight, and latch friction at any point in the closing arc, including near the latch point where spring-stored energy is lowest. This requirement is the primary driver for selecting spring tension: start with the minimum tension that achieves positive latching, then verify under real-world conditions including open windows, HVAC pressure, and simultaneous door openings in adjacent corridors.
NFPA 80 does not permit mixing self-closing hinges with standard non-closing hinges on a fire-rated door assembly unless the assembly is specifically UL-listed for that configuration. In practice, all hinges on a fire-rated door should be the same type and should all be self-closing if the assembly relies on spring hinges for the closing function. Using one non-closing hinge with two spring hinges may satisfy the hinge count requirement but could compromise the closing force and is not standard practice for new commercial installations.
The choice between spring hinges and hydraulic self-closing hinges (such as Waterson's hydraulic closer hinges) involves several trade-offs in performance, cost, and code compliance:
| Characteristic | Spring Hinge | Hydraulic Self-Closing Hinge |
|---|---|---|
| Closing Speed Control | None — speed set by spring tension and door weight | Adjustable via fluid flow orifice screw |
| ADA Compliance | Difficult to achieve reliably | Field-adjustable to meet ≥1.5s / ≤5 lbf |
| Door Slamming | Common at higher tension settings | Prevented by hydraulic dampening |
| Noise Level | Higher — slamming possible | Lower — controlled, quiet closing |
| Initial Cost | Lower | Higher |
| Complexity | Simple — no fluids, no temperature sensitivity | Moderate — sealed hydraulic circuit |
| NFPA 80 Fire Door | Yes (UL-listed models) | Yes (UL-listed models) |
| Best For | Budget installations, light commercial, residential | ADA doors, hospitals, schools, high-traffic commercial |
For applications where ADA closing-speed compliance is required, hydraulic or hybrid (spring plus hydraulic) self-closing hinges — such as those manufactured by Waterson — are the preferred solution. The hydraulic circuit provides the precise, adjustable speed control that pure spring hinges cannot deliver. For budget-sensitive applications on non-ADA corridors where controlled closing speed is not required, spring hinges remain a practical and code-compliant choice.
In residential settings, spring hinges serve primarily as a convenience feature — keeping screen doors, garage entry doors, or basement doors closed without requiring the occupant to manually close them. Residential spring hinges are typically 3-1/2 inch Grade 3 products, installed in sets of two per door. Tension requirements are lower because residential doors are lighter and the consequences of a failure to latch are less severe (no fire code implications). Common residential applications include:
Commercial spring hinge applications are driven primarily by code compliance — NFPA 80 fire door requirements, stairwell door requirements under the International Building Code (IBC), and occupancy separation requirements. Commercial spring hinges must be Grade 1, UL-listed where required, and sized appropriately for the door weight and traffic volume. Common commercial applications include:
In very high-traffic commercial environments such as school main corridors, hospital staff passages, and busy retail exits, spring hinges have limitations. The lack of speed control can result in slamming, which is both noisy and abrasive to door hardware over time. Repeated slamming accelerates wear on door frames, latches, and strike plates. In these environments, hydraulic or hybrid self-closing hinges deliver significantly better long-term performance despite higher initial cost.
Spring hinges are installed in the same mortise cutout as standard butt hinges. No special door or frame preparation is required beyond standard hinge mortise dimensions. Installation sequence:
Spring hinges require minimal maintenance under normal service conditions. Inspect annually for:
Spring cartridges are field-replaceable on most commercial spring hinges without removing the hinge from the door. When a spring fails to provide adequate closing force and re-tensioning does not restore performance, replace the cartridge rather than the entire hinge.
Q: How many spring hinges are required on a fire door?
A: NFPA 80 requires a minimum of two spring hinges per fire-rated door leaf. For doors taller than 60 inches, three spring hinges are standard practice. The general guideline is one hinge per 30 inches of door height. All spring hinges on fire-rated doors must be UL-listed for the fire-rating duration of the assembly.
Q: What is the difference between single-acting and double-acting spring hinges?
A: A single-acting spring hinge returns the door to closed from one swing direction only — appropriate for standard corridor, stairwell, and egress doors that swing in one direction against a fixed frame stop. A double-acting spring hinge has two opposing spring cartridges and allows the door to swing fully in both directions, returning to a vertical center from either side. Double-acting hinges are used on café doors, kitchen pass-throughs, and bi-directional traffic doors. They are not suitable for fire-rated door assemblies.
Q: Can spring hinges meet ADA closing-speed requirements?
A: Pure spring hinges without hydraulic dampening generally cannot reliably meet ADA closing-speed requirements, which mandate a minimum of 1.5 seconds from 70 degrees to 3 inches before the latch at a maximum force of 5 lbf. Spring tension sufficient to reliably latch heavier doors often produces faster closing speeds than ADA allows. Hydraulic or hybrid self-closing hinges are the appropriate solution for ADA-compliant doors requiring self-closing hardware.
Q: How do I adjust the tension on a spring hinge?
A: Partially withdraw the hinge pin to access the spring cartridge tension adjustment slots. Using the tension tool supplied by the manufacturer or a stiff steel pin, rotate the cartridge to the desired tension notch, then re-seat the hinge pin to lock the setting. Higher notch numbers mean greater spring tension and faster, more forceful closing. Always set the lowest tension that reliably closes and latches the door — excess tension accelerates spring fatigue and can make the door difficult to open.
Q: What ANSI/BHMA standard applies to spring hinges?
A: Spring hinges are governed by ANSI/BHMA A156.17, the standard for self-closing hinges. Grade 1 (1,000,000 cycles minimum) is required for commercial and fire-rated door applications. Grade 2 (500,000 cycles) suits light commercial use. Grade 3 is for residential applications only. Fire-rated door installations additionally require a UL listing appropriate for the fire-rating duration of the assembly.
UL-listed, ANSI/BHMA Grade 1 — ISO 9001-certified manufacturer since 1979