Door Strikes Explained: Types, Fail-Safe vs. Fail-Secure, and Selection

 

 

If you’re looking at a door strike, you’re probably trying to answer a simple question with a surprisingly technical answer: is this just the metal plate in the frame, or is it the powered device that lets an access control or intercom system release a door?

A door strike is the frame-mounted part that receives a lock’s latch or bolt. In everyday hardware conversations, the term can refer to a passive strike plate or to an electric strike. A strike plate has no powered release function. An electric strike has a powered movable keeper that can release a compatible latch when an access-control system, credential reader, or video intercom authorizes entry.

That difference matters before anyone orders hardware. The right door strike depends on the lock, the door’s egress and fire-rating role, what should happen during a power outage, how the frame can be prepared, and how the opening will connect to access control. This guide starts with the hardware, then moves into the selection questions that matter for managed properties.

This guide will answer:

• What is a door strike?
• How an electric strike works
• Fail-safe, fail-secure, and hold-open behavior
• Types of electric strikes and frame preparation
• Standards, fire ratings, and egress requirements
• Electric strikes and other electrified locks
• How to choose a door strike for a managed property
• Power, installation, and access control integration
• Costs, maintenance, and troubleshooting
• FAQs

 

Watch how ButterflyMX works:

 

What is a door strike?

A door strike is the piece of hardware in the door frame that receives the latch or bolt when the door closes. On a standard mechanical door, that usually means a strike plate: a passive metal plate with an opening for the latch. The latch enters the strike, and the door stays closed until someone operates the lock or handle from the correct side.

An electric strike does more. It is still mounted in the frame, but it includes a movable keeper that can release when the right electrical signal is sent. Instead of retracting the latch inside the door, the electric strike changes the frame-side opening so the latch can pass through.

That is why strike plate and electric strike should not be used as exact synonyms. A strike plate holds the latch. An electric strike can release a compatible latched door as part of an access-control system. Some people also use phrases such as electronic door latch when discussing powered entry hardware, but the important distinction is which part is being electrified: the frame-mounted strike, the lock in the door, or another device entirely.

For a managed property, the difference affects the whole opening. Before choosing an electric strike, identify the existing lock, confirm how people must exit, check whether the door is fire rated, and understand what should happen during normal operation and during a power outage.

 

How an electric strike works

An electric strike releases the keeper in the frame rather than pulling the latch back into the door. Electric-strike technical guidance from Von Duprin describes this basic relationship: the device uses external power to change the keeper state so a compatible latch can pass.

In plain terms, the keeper acts like a small gate for the latch. When the door is closed, the latch sits in the strike. When the access system authorizes entry, the powered actuator changes the keeper position. The person entering can then push or pull the door open without mechanically turning the lockset from the secured side.

1. The door closes, and the latch rests in the strike keeper.
2. A credential reader, access controller, or video intercom authorizes entry.
3. The control circuit sends the designed release signal.
4. The powered actuator changes the keeper position.
5. The latch passes the keeper as the door opens.
6. After the door closes again, the latch and strike return to their normal secured relationship according to the product’s design.

The main parts to recognize are the frame, latch bolt, movable keeper, electric actuator, power supply, and control output or relay. Those words matter because a generic wiring diagram is rarely enough for a real project. The exact movement, electrical behavior, and mounting requirements depend on the strike model, the lock, and the frame.

Electric strikes require external power, so hardware selection is also an electrical-planning question. A qualified installer should confirm voltage, current draw, duty cycle, power-supply capacity, wire distance, voltage drop, and the controller or relay design. Continuous-duty language describes whether a device is designed to remain energized for an extended period, but it does not replace the product’s ratings and instructions.

Sound can also vary. AC electric strikes are commonly associated with an audible buzz, while DC electric strikes are often quieter and may make more of a click. Treat that as a common operating tendency, not a promise about every product or installation.

 

Fail-safe, fail-secure, and hold-open behavior

The most important electric-strike question is not which label sounds safer. It is what happens when power is removed. A fail-secure electric strike remains locked from the secured side when power is lost. A fail-safe electric strike unlocks when power is lost.

That difference affects security, emergency planning, backup power, and egress coordination. The National Institutes of Health technical bulletin on fail-safe and fail-secure locksets is a useful reminder that power-loss behavior has to be evaluated with the door, the lock, and the opening’s life-safety role, not as a standalone label.

Use the table below as a behavior comparison, not as a project-specific code decision.

Option	Power-loss outcome	Powered state	Planning implication	Fire-rated door caution
Fail-secure	The secured side remains locked when power is removed.	Power is normally applied to release the keeper.	Egress hardware and emergency behavior must still be planned for the opening.	If positive latching must be maintained, fail-secure operation may be required. Verify the listed assembly and local AHJ requirements.
Fail-safe	The opening unlocks when power is removed.	Power is normally applied to maintain the locked state.	The unlocked outage state affects security, backup power, and emergency planning.	Do not assume it is permitted on a fire-rated opening. Confirm the current code, listing, and AHJ decision.

Hold-open is a separate feature. Depending on the model, it may allow the keeper to remain in a released state until the door is opened, closed, or reset. Some electric strikes can be field-reversed between fail-safe and fail-secure behavior, but many cannot. Even when a model is reversible, changing the setting can affect listings, power-loss behavior, and the way the opening should be tested.

For fire-rated and egress doors, keep the qualification close to the decision: the complete door assembly, locking hardware, listings, adopted code, local amendments, and authority having jurisdiction all matter. A fail-safe or fail-secure label tells you what the strike does without power. It does not tell you, by itself, whether the whole opening is acceptable.

 

Types of electric strikes and frame preparation

Electric strikes are usually chosen around the lock hardware they must receive. That is why compatibility starts with the latch or bolt already on the door, not with a product category on a sales page. A hardware professional should compare the proposed strike with the lock type, latch geometry, handing, faceplate, frame material, door condition, and listing requirements.

 

Cylindrical, mortise, rim, and deadbolt applications

• Cylindrical lock strikes are designed around the spring latch used with compatible cylindrical locksets.
• Mortise lock strikes are designed for compatible mortise hardware, where the latch and deadbolt arrangement may differ from a cylindrical lock.
• Rim or panic-device strikes are intended for compatible rim exit devices and need careful coordination with egress hardware.
• Deadbolt applications are specialized. Do not assume a strike built for a spring latch will work with a deadbolt, or that every specialized model handles recapture, hold-open, or release behavior the same way.

Frame preparation is the next dividing line. A cut-in strike is recessed into the jamb, which may require cutting, finishing, and careful alignment. In supported applications, a no-cut electric strike can be surface-mounted to the jamb instead of cutting the strike body into the frame. That can be useful in some retrofit projects, but no-cut does not mean installation-free. Wiring, mounting conditions, alignment, and lock compatibility still need review. For more detail on that retrofit approach, see this no-cut electric strike guide.

Before ordering hardware, document the door’s handing, lock type, latch projection, frame material, existing strike opening, door and frame condition, and whether monitoring is required. A field survey is often more reliable than choosing from a category label alone. If the broader lock category is unclear, this guide to commercial door locks can help establish the vocabulary for the discussion.

 

Standards, fire ratings, and egress requirements

ANSI/BHMA A156.31 is the US standard that addresses performance, durability, and safety or security testing for electric strikes and frame-mounted actuators. The BHMA summary of ANSI/BHMA A156.31-2019 gives useful context for why product grades and force ratings should not be treated as universal rules. The applicable standard edition and certified product information should be checked before a specification relies on those claims.

A rating answers a narrow question: how a product performed under the conditions of its test standard. It does not prove that the device is right for every interior, exterior, high-traffic, or higher-risk opening. The full door assembly, installation quality, alignment, exposure, listing, and maintenance plan all affect real-world performance.

Fire-rated doors require especially careful coordination because the listed assembly and positive-latching behavior must be protected. If an opening must stay positively latched when power is lost, fail-secure operation may be the required direction. Even then, the specific strike, door, frame, lock, listing, and local requirements must be verified together. NFPA 80, UL 10C, product listings, and local amendments may all be part of that review.

Means-of-egress rules are also opening-specific. NFPA guidance on permissible egress-door locking arrangements explains that egress-door locking is limited and that occupants generally must be able to exit without a key, tool, or special knowledge, subject to defined exceptions. This article is not legal, code, or project-compliance advice. Fire-door, emergency-release, and egress decisions should be routed through qualified professionals and the authority having jurisdiction.

 

Electric strikes and other electrified locks

An electric strike is only one way to electrify an opening. It changes the frame-side keeper while the compatible latch remains in the door. Other electrified locks act on different parts of the opening, so they are not interchangeable simply because they all support controlled entry.

An electromagnetic lock, often called a maglock, secures the opening with magnetic force. It generally requires continuous power to remain locked, which means removing power removes the holding force. That makes the power-loss behavior very different from many electric-strike applications, and it puts extra attention on the release and egress arrangement.

Electrified mortise locks and electric latch retraction work differently again. An electrified mortise lock places the electrical actuation in the lock body in the door. Electric latch retraction commonly actuates compatible exit-device hardware. These options may support similar access-control goals, but they differ in preparation work, power behavior, listings, maintenance, and compatibility.

The practical choice is not a contest between technologies. Start with the existing door hardware and frame, then compare power-loss behavior, egress role, fire-rating implications, preparation work, and maintenance needs. For a deeper category comparison, see this guide to electric locks versus magnetic locks.

 

How to choose a door strike for a managed property

A good selection process moves from the physical opening outward. If the strike does not fit the lock, frame, and life-safety role, the access-control plan will not fix the problem later.

1. Identify the existing lock and latch. Confirm whether the opening uses cylindrical, mortise, rim or panic, or specialized deadbolt hardware. Then compare latch geometry and handing with the proposed strike documentation.
2. Classify the opening. Note whether it is a resident entrance, office suite, package room, service door, student-housing common area, or gated-property access point. The property type does not prescribe the hardware, but it helps frame the traffic, security, and maintenance questions.
3. Check fire and egress roles. If the door is fire rated or part of a means of egress, verify the complete listed assembly, current locally adopted requirements, and AHJ expectations before choosing power-loss behavior or changing hardware.
4. Review performance requirements. Look at the required grade, listing, duty rating, environmental suitability, exposure, and maintenance expectations. Do not turn one holding-force number into a universal security recommendation.
5. Plan the electrical side. Confirm voltage, current capacity, duty cycle, available power, wire route, distance, voltage drop, and the location of the power supply and controller.
6. Inspect installation conditions. Check the frame preparation, cable path, alignment, door condition, trim clearance, and whether a cut-in or applicable no-cut approach is practical.
7. Map the access process. Determine how credentials, readers, access controllers, video intercoms, and remote-release procedures will trigger the strike. Also decide how staff will test the opening after installation and maintain it over time.

This is where managed properties benefit from being specific. A multifamily entry, a commercial office, a gated community entrance, a student-housing common area, and a package room may all use access control, but each opening can have different hardware, traffic, egress, and maintenance needs. The right question is not which strike is best in general. It is which strike fits this opening and this controlled-entry process.

 

Power, installation, and access control integration

In a controlled-entry setup, a credential reader, access controller, or video intercom sends an authorized release signal. The control output or relay operates the designed strike circuit, the keeper releases, and the door relatches after it closes. The access system does not make the hardware selection for you. The strike, power supply, relay, wiring, lock, and door conditions have to work together.

Installation planning should include the strike’s voltage and current requirements, duty rating, power-supply capacity, wiring distance, voltage-drop considerations, frame preparation, cable routing, latch alignment, and testing in both normal and power-loss conditions. Qualified installers should also coordinate any required fire-alarm interface, emergency-release logic, and egress considerations with the applicable project requirements. Avoid universal terminal assignments, conductor sizes, or power values because those depend on the specific system design and product documentation.

ButterflyMX becomes relevant when the opening is part of a connected property-access system. A ButterflyMX video intercom or access-control system can support credentialed and remotely granted access, while the electric strike remains the hardware that releases the compatible latched door. ButterflyMX also provides technical documentation for an isolation-relay DC strike integration. Treat that as a supported integration example, not as proof that every strike, relay, power supply, or wiring design is compatible.

For the broader system decision, review the role of access control hardware and the ButterflyMX access control system. The correct configuration should be confirmed against the proposed strike, controller, power supply, and installation documentation. After the opening requirements are clear, explore ButterflyMX access control options for your property.

 

Costs, maintenance, and troubleshooting

The cost of an electric-strike project is more than the strike on the invoice. The total can include the strike, power supply, control equipment, relays, wiring, frame preparation, labor, required listings, testing, and repairs to preexisting door or frame problems. Pricing varies by configuration, market, and opening condition, so an undated product-price list is not a reliable budget tool. Use current, sourced quotes for the exact hardware and scope.

Maintenance starts with the mechanical door. An electric strike cannot compensate for a sagging door, damaged latch, misaligned keeper, loose mounting, or incompatible lock geometry. Regular inspection should include latch engagement, door closing, fasteners, visible wear, accessible cable condition, and reliable operation after an authorized release.

 

First checks when an electric strike is not working

• If the door does not release, have a qualified technician verify the authorization signal, relay operation, power at the device, voltage drop, and the strike’s documented duty requirements.
• If the door releases but will not relatch, inspect door alignment, latch engagement, keeper condition, and whether the lock and strike are compatible.
• If there is unexpected buzzing or noise, review the device’s power type and installation documentation. AC buzzing and quieter DC operation are common tendencies, not a diagnostic rule.
• If operation is intermittent, investigate loose connections, insufficient circuit capacity, excessive voltage drop, controller or relay issues, and mechanical binding through qualified service personnel.
• If the opening is fire rated or part of egress, do not alter listed hardware or life-safety wiring as an improvised repair. Escalate the issue to qualified professionals who can verify the complete assembly.

Forced-entry resistance depends on the rated product, the complete door assembly, installation quality, hardware alignment, and ongoing maintenance. A single force value cannot describe the security of every opening. The best long-term plan pairs compatible hardware with documented installation, inspection, and service procedures.

 

Frequently asked questions

Is a door strike the same as an electric strike?

No. A door strike can mean a passive strike plate or a powered electric strike. A strike plate holds the latch mechanically, while an electric strike can release a compatible latch when an access-control system sends the proper signal.

 

Do I need an electric strike to add keyless access?

Not necessarily. Keyless access depends on how the credentialed system will operate the existing lock, door, and frame. Some projects use an electric strike, while others may need a different electrified lock or access-control arrangement.

 

Can an electric strike be used on a fire-rated door?

Only if the exact strike, lock, door, frame, listing, and local requirements support that use. Fire-rated and egress openings need review by qualified professionals and the authority having jurisdiction before hardware is changed.

 

Do electric strikes work with video intercoms?

They can. In a typical arrangement, the video intercom or access controller sends a release signal to the designed strike circuit. The proposed strike, relay, power supply, controller, and wiring design must all be verified for the specific installation.

 

A door strike is a small part of the opening, but choosing the powered version is not a small decision. Start with the lock and frame, then confirm the power-loss outcome, egress and fire-door requirements, ratings, installation conditions, and access-control connection.

For properties planning connected entry, an electric strike can be one part of a larger system for credentialed and remotely granted access. Talk with ButterflyMX about planning a connected entry workflow after qualified professionals have evaluated the openings and hardware requirements.

Get your free quote!

Fill in the form below, and we'll email you right back.

Want a free quote?

Fill in the form below, and we'll email you right back.