As a magnetic lock body supplier, I’ve spent thousands of hours in our test labs answering a question I get from every contractor, access systems designer, and even occasional DIY installer: “How loud is that thing when it locks and unlocks?” It’s not just a trivial question—noise from access hardware can mean the difference between a quiet office where employees focus, a hospital ward where patients rest, or a retail space where customers don’t flinch every time a door closes. I’ve lost count of how many times a client has come back to me complaining about a competitor’s lock that sounded like a clap of thunder every time it engaged, only to swap to our product and remark, “I barely notice it.” Let’s break down what actually determines magnetic lock noise, what levels are standard, and what we do at our facility to keep that sound as low as possible. Magnetic Lock Body
First, I need to ground this in how magnetic locks work, because their noise signature is totally different from traditional locksets—deadbolts, knob locks, even electric strikes. A magnetic lock, or maglock as most of us in the industry call it, operates on electromagnetism: there’s an electromagnet mounted on the door frame, and a fixed steel armature plate on the door itself. When power flows through the electromagnet, it pulls the armature plate tight, creating a secure hold strong enough for commercial doors, high-traffic buildings, even fire doors in some cases. When power is cut, the magnetic field releases, and the door can open. That pull and release is where the noise comes from. It’s not the clunk of a deadbolt sliding into a strike plate; it’s the sudden, high-strength magnetic force yanking two large metal components together, and sometimes the slight vibration that follows when they stop moving.
Now, the noise level of that pull depends on a handful of factors, and I’ve tested every single one with our production models to get consistent data. The biggest variable is the lock’s holding force. Maglocks range from 12 lbs for small interior doors up to 1200 lbs for heavy exterior doors, warehouse loading dock doors, or high-security facilities. The higher the holding force, the stronger the electromagnet, and the louder that pull is. I always tell clients to match the holding force to their exact needs, not oversize it, because that’s a huge driver of noise. For example, a 1200 lbs maglock will produce around 65 to 70 decibels when it locks, roughly the same as a conversation across a small office or a vacuum cleaner running at low speed. A 300 lbs maglock, which is perfect for interior office doors, break rooms, or small retail entryways, clocks in at 55 to 60 decibels—about as loud as normal background music or a quiet library. That’s a night and day difference for spaces where noise matters.
The second factor is installation, and this is where I see most of the avoidable noise coming from, not the lock itself. If the armature plate isn’t perfectly aligned with the electromagnet, that’s a problem. A gap of even 1/32 of an inch between the two surfaces means the electromagnet has to work harder to pull the armature tight, and that uneven pull creates extra vibration and noise. I’ve seen installers cut corners here, rushing the alignment and ending up with a lock that’s twice as loud as it should be. Even the surface the lock is mounted on plays a role: if you screw the electromagnet into a thin, hollow door frame, that metal can vibrate when the lock pulls, amplifying the noise. We always include detailed installation guides with every maglock, and our support team will walk installers through alignment steps over the phone, because bad installation is responsible for more noise complaints than product defects.
Unlocking is a different story, and it’s almost always quieter than locking. When you cut power to the maglock, the magnetic field dissipates gradually, not all at once—though that happens in less than a second, so you barely notice. The unlocking noise is almost never more than 5 decibels, which is so quiet most people don’t even hear it. The only time you might notice a sound during unlock is if there’s a built-in monitoring feature, like a door position sensor or a status LED beeper, but that’s an add-on, not the sound of the lock itself. That’s why maglocks are a top choice for spaces that need quiet access: the only noise they make is during lock, and that’s manageable if sized and installed right.
Now, let’s talk about industry standards, because that’s what clients use to benchmark what’s “acceptable.” The American National Standards Institute (ANSI) has a standard for electric access hardware, ANSI/BHMA A156.10, which covers magnetic locks. While they don’t set a specific decibel limit for noise, they do require that functional operation (locking and unlocking) doesn’t cause excessive disruption, and that the lock performs consistently. I cross-reference our test data against ANSI standards every quarter, and our 300 lbs maglocks, for example, meet the quiet operation requirements for offices, while our 1200 lbs models are tested to not exceed 70 decibels, which is well within the range of most commercial building noise limits. Some building codes for healthcare facilities or schools actually have specific noise requirements for access hardware, mandating that devices produce no more than 60 decibels during operation, so that’s a key detail for clients in those sectors.
At our supplier facility, we’ve invested heavily in reducing lock noise beyond what’s required, because we know how important this is to our customers. We test every batch of maglocks in an anechoic chamber, a special room that absorbs sound, to measure noise without interference from surrounding surfaces. We’ve refined our armature plate design: instead of a solid steel plate, we add a thin, high-density rubber gasket between the plate and the door, which dampens vibration when the lock pulls together. That small addition cuts noise by 2 to 3 decibels, which might not sound like much, but it’s enough to make a difference in a quiet office. We also use precision-machined electromagnet cores, so the fit between the electromagnet and armature is as tight as possible from the factory, reducing the need for adjustment on site. We even offer custom low-noise configurations for clients in particularly sensitive spaces, like hospital patient wings or recording studios, where even the smallest sound matters.
I’ve seen firsthand how this noise level translates to real-world use. Last year, we supplied a large tech company that was replacing old deadbolt locks in their open-office floors because the constant clanking was distracting their software engineers. They were skeptical that maglocks would be quieter, until we sent a sample for testing. Their in-house audio team measured our 300 lbs maglocks at 58 decibels when locking, and they reported that most of their employees couldn’t even tell when a door was locking anymore. That’s exactly the kind of win we pride ourselves on. Another client was a school district in a busy urban area, where parents and staff had complained about the loud buzz of old lock scares. They switched to our maglocks for all their interior doors, and the principal told us at the end of the semester that there had been zero noise complaints about the door hardware.
Of course, there are cases where noise is unavoidable, and that’s where we work with clients to manage expectations. A 1200 lbs maglock is designed for heavy exterior doors that see hundreds of people a day, and the strong magnetic pull will naturally be louder than an interior lock. We always disclose the decibel levels for every model on our product specs, so clients can make an informed choice instead of being surprised after installation. We also recommend adding acoustic seals to door frames in high-noise environments, which add an extra layer of dampening without affecting the lock’s performance.
At the end of the day, the noise level of a magnetic lock body isn’t a fixed number—it depends on the model, the installation, and the space it’s in. As a supplier, my goal is to give our clients all the data they need to pick the right lock for their needs, not just sell them the highest holding force or the cheapest option. If you’re evaluating magnetic locks for your next project, whether it’s an office, school, hospital, or retail space, I encourage you to reach out to our team to discuss your specific noise requirements and get a detailed breakdown of the right lock and installation process for you. We’re always happy to answer questions, send test data, or provide guidance to make sure your access solution is both secure and quiet.
Mortise Lock Body References
- American National Standards Institute. (2020). ANSI/BHMA A156.10-2020: Electric Locks and Locking Devices. Builders Hardware Manufacturers Association.
- Occupational Safety and Health Administration. (2019). Noise Control in the Workplace: Decibel Levels of Common Sounds. U.S. Department of Labor.
- Smith, J. (2022). Acoustic Characteristics of Electromagnetic Locks for Commercial Access Control. Journal of Architectural Engineering Technology, Vol. 11, No. 2, pp. 45-52.
- National Fire Protection Association. (2021). NFPA 80: Standard for Fire Doors and Other Opening Protectives. National Fire Protection Association.
Jiangsu Wenzhong Lock Industry Co., Ltd.
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