Electric Strike vs. Magnetic Lock: Choosing Door Release Hardware for NYC Buildings

An electric strike releases a latch that is still mechanical; a magnetic lock holds the door shut with an electromagnet and nothing else. That one difference decides the rest. A strike can be fail-secure - locked when the power dies - which is why it is the standard for apartment-house entrances and fire-rated doors. A maglock unlocks the moment power or the fire alarm signal drops, so it needs exit sensors, a release button, and a careful look at the egress rules before anyone mounts it.

How an Electric Strike Works

An electric strike replaces the strike plate - the metal pocket in the door frame that the latch drops into. Instead of a fixed pocket, it has a hinged keeper. Energise the strike and the keeper swings free, so a push on the door pulls the latch straight out of the frame. The lock itself never changes state: the latch is still extended, the lever still works, and a key still operates the cylinder exactly as before.

That is why the strike is the workhorse of New York buzz-in entries. When the intercom releases the vestibule door in a Washington Heights walk-up or a Park Slope brownstone, an electric strike is almost always what you are hearing. The classic buzz is an AC-powered solenoid vibrating; DC strikes do the same job silently and are usual on access-control doors where a buzz would be noise rather than feedback.

Two specifications matter more than the brand on the box. Duty rating: a strike that sits released for long stretches - a loading dock during deliveries, a lobby on a schedule - must be rated for continuous duty, or the coil cooks. And preload: doors in high-rises sit under pressure from stack effect, wind, and closer tension, which binds the latch against the keeper. A strike with a published preload rating releases under that load; one without it clicks and does nothing - the most common version of "the buzzer works but the door will not open."

How a Magnetic Lock Works

A magnetic lock, or maglock, is an electromagnet mounted on the frame and a steel armature plate mounted on the door. Power the magnet and the two clamp together; cut the power and they separate instantly. Common sizes are rated around 600 or 1,200 pounds of holding force, and a correctly installed one is extremely difficult to pull apart.

What a maglock does not do is latch. There is no bolt, no keeper, no mechanical engagement of any kind - which means the door is only locked while current is flowing. Lose power and the door is open. That is not a defect; it is the defining property, and every rule that surrounds maglocks follows from it.

Maglocks earn their place where there is nothing to latch into: full-glass office suite doors, aluminium storefront pairs, gates, and frames that will not take a strike. They also forgive the sloppy alignment that plagues old buildings, since no latch has to find a pocket.

Fail-Safe vs. Fail-Secure: The Distinction That Decides Everything

These two terms get used loosely and they are not interchangeable.

• Fail-secure means the door stays locked when power is lost. Electric strikes are commonly specified this way. Crucially, it does not trap anyone: the inside lever or panic bar still retracts the latch mechanically, so people get out of the building whether or not the electronics are alive.
• Fail-safe means the door unlocks when power is lost. Maglocks are inherently fail-safe, and strikes can be ordered that way too - usually for stairwell re-entry and similar applications where a power loss should open the door rather than hold it.

For a residential building entrance, fail-secure is almost always what you want: a blackout should not leave the front door of the building standing unlocked all night. For a door whose only job is keeping an office suite private, fail-safe may be perfectly reasonable. The question to ask a vendor is simple and revealing: what is the state of this door at 3 a.m. when the power is out?

Egress and Fire Rules: Where Maglocks Get Buildings in Trouble

Because a maglock has no mechanical release, pushing on the door does nothing while it is energised. Every code framework therefore requires an independent way to drop the magnet on the way out - typically a motion sensor above the door that detects an approaching occupant, a clearly marked push-to-exit button, and release on fire alarm activation and on loss of power. Those components are not optional extras; they are the reason the installation is permitted at all. A maglock wired to a card reader with no exit release is a door that will not open in an emergency.

Fire-rated door assemblies are a harder line. Those doors must latch positively to do their job of holding back fire and smoke, so a hardware arrangement that merely holds a door closed with a magnet does not satisfy the latching requirement, and fail-safe hardware that unlocks on power loss is the wrong choice there. Electrified hardware on a rated assembly has to be listed for that use and fail-secure. This is the same territory as fire escape and egress door lock requirements in NYC and panic bar hardware - the kind of thing an inspector notices immediately.

We will say plainly what we say about every code question: we fit and service hardware, we do not make code determinations for your building. Which rules apply to a given door depends on the occupancy, the construction, and the approved plans, and the people to answer that are a registered design professional and the relevant city agencies. Installing a maglock on an egress or fire-rated door without that review is where buildings collect violations.

Matching the Hardware to the Door You Actually Have

Most bad installations come from choosing the device before looking at the door.

• Cylindrical lever lock in a wood or hollow-metal frame. The straightforward electric strike case, and the most common vestibule and office-door retrofit in the city.
• Mortise lock. A strike has to be matched to the mortise lock's latch and to whether an auxiliary deadlatch is present. Older NYC buildings are full of mortise hardware, and mortise lock repair is often the honest first step before anything gets electrified.
• Door with a panic bar. You do not put a strike on the deadlocking latch of an exit device and hope. The usual answers are a rim strike designed for that device or electric latch retraction built into the bar itself.
• Aluminium storefront or full-glass doors. Narrow stiles leave little to work with, and this is where maglocks or electrified panic hardware usually win - with the exit sensors and release button that come with the territory. Storefront security overnight covers the rest of that picture.
• Doors secured with a deadbolt. An electric strike releases a latch, not a deadbolt. A door that needs to throw a bolt and be released electrically needs an electrified mortise lock or an electric bolt - not a strike bolted on next to a deadbolt that still has to be turned by hand.

The Failures We Actually Get Called For

Electrified doors fail in a small number of recognisable ways, and the symptom usually tells you where to look.

• The strike buzzes but the door will not push open. Classic preload. The door is being held against the keeper by closer tension, wind, or building pressure. Sometimes a closer adjustment or a strike alignment fixes it; sometimes the strike is simply the wrong model for the door. Door closer repair is frequently part of the answer.
• Nothing happens when the button is pressed. Usually power: a failed transformer or power supply, a tripped breaker on the entry panel circuit, or a broken conductor in a door loop that has been flexing for fifteen years.
• The door releases but then will not latch again. A worn keeper, a strike mounted slightly out of position, or a door and frame that have moved - the same misalignment family as a door that will not lock properly.
• A maglock that holds weakly or leaves the door rattling. Nearly always the armature: mounting bolts loosened by thousands of cycles, a plate that has lost its ability to pivot and seat flat against the magnet, or debris on the faces.
• The exit sensor releases the maglock when nobody is leaving. A motion sensor aimed too wide, picking up traffic in a corridor or a radiator plume. It reads as a random unlocking door and it is a real security hole.
• Residents propping the door. Not a hardware fault, but the most common security failure in NYC apartment houses - and usually a symptom of a release that is too fast, a closer that is too strong, or an entry system that nobody trusts. Buzzer and intercom problems covers the resident-facing side.

Choosing for the Building You Have

Brownstone or walk-up vestibule: a fail-secure electric strike on the inner door, intercom release, and a closer that actually closes it - a vestibule that does not latch is decorative. Larger apartment house with fobs or cards: fail-secure strike or electrified lock at the entrance, door position monitoring so the office knows when a door has been propped, and a credential system the managing agent can administer when someone moves out - the same key-control logic as a master key system.

Office suite with glass doors: a maglock or electrified panic hardware, with the exit sensor, release button, fire alarm interface, and signage treated as part of the installation rather than extras; access control for NYC small businesses covers readers and administration. Storefront: electrified hardware for daytime control, mechanical security for overnight - an electrified door is an access-control device, not a substitute for a proper lock and gate when the shop is closed.

Who Installs What

These jobs usually touch three trades, and knowing the split saves arguments. A locksmith owns the door hardware: the strike, the lock, the exit device, the closer, alignment, and keying. Low-voltage and access-control work covers readers, controllers, power supplies, and cabling. A licensed electrician handles line-voltage supply, and anything tied into the building's fire alarm system belongs to the fire alarm contractor working under the approved design. Where a project crosses those boundaries - and a maglock on an egress door always does - it needs a professional review of the egress and fire requirements before the first hole is drilled.

For any retrofit, the first question is whether the door and frame are sound. Electrifying a door that is out of square, with a tired closer and a worn latch, produces an expensive version of the same problem. Fix the door, then automate it.

Common Questions About Electric Strikes and Magnetic Locks

Related Resources

• Buzzer and Intercom Problems in NYC - When the entry system is the thing that failed
• Access Control for NYC Small Businesses - Readers, credentials, and administration
• Push Bar & Panic Bar Repair - Exit device hardware and what inspectors look for
• Door Closer Repair in NYC - The closer tension behind most release failures
• Fire Escape Door Lock Requirements - Egress rules that shape every hardware choice
• Commercial Locksmith Service - Entrances, offices, and storefronts across NYC
• Contact Emergency Locksmith NY - Describe the door and we will tell you what fits