Medeco vs Mul-T-Lock: Which High-Security Lock Fits?
Medeco and Mul-T-Lock are both serious upgrades over a standard hardware-store cylinder, and for most Delaware doors either one will do the job. The real choice comes down to three things: how tightly you need to control who can copy your keys, how well the cylinder fits the hardware you already have, and what the installed price looks like once the quote is itemized. This guide walks through each, with a short note on where Abloy fits, so you can walk into a conversation with a locksmith knowing what to ask.
TL;DR
Medeco is best known as the North American institutional standard, with angled cuts, restricted keys and the widest retrofit catalog for major U.S. commercial lock bodies.
Mul-T-Lock is known for its pin-in-pin telescopic design, strong pick resistance and, on its MTL800 platform, extensive master-keying.
Both carry UL 437 listings, so the gap in raw attack resistance is smaller than the marketing suggests. Key control and fit usually decide the purchase.
Ask for an itemized, written quote. Published list prices are not guaranteed without one.
Installation quality matters as much as the brand: a strong cylinder in a weak door or loose strike plate is still a weak door.
Table of Contents
What “high security” actually means
A standard cylinder relies on simple pin tumblers and a key that any hardware kiosk can copy. A high-security cylinder changes that in two ways. It makes the lock harder to defeat without the key (picking, bumping, drilling, forced entry), and it makes the key harder to duplicate without permission.
There is a formal yardstick for the first part. UL 437 and BHMA/ANSI 156.30 specify minimum resistance times of 10 to 15 minutes for picking and decoding and five minutes for forced-entry attacks. Those numbers are a floor, not a promise that nothing can ever get through, and they are worth keeping in mind when you read any brand’s claims. Medeco and Mul-T-Lock both carry UL 437 listings for attack resistance, which puts them in the same tier on paper.
The second part, key control, is where the two brands differ most in practice, and where most owners should spend their attention.
How the two designs differ
Medeco: angled cuts and restricted keys
Medeco sells high-security door locks with patent-protected keys, and its cylinders are widely treated as the North American institutional default. The company’s own 2025 catalog explains the practical consequence: its restricted keys are custom-coined and tracked by Medeco, and the cylinders need special cutting machines for the angled cuts and tight tolerances. An ordinary hardware store generally does not have those machines.
That is the point of the design. Even if someone holds your key, they cannot simply walk to a kiosk and have a copy ground in five minutes.
Mul-T-Lock: telescopic pins and a triple-locking arrangement
Mul-T-Lock is known for a pin-in-pin telescopic design and strong pick resistance. On its current MTL800 platform, the manufacturer describes a triple-locking arrangement that combines a double-alpha spring, a locking bar and telescopic pinning. The same page says the design is intended to resist picking, drilling, bumping and other manipulation, supports complex master-key systems and exclusive keyways, and stays backward compatible with the older MT5+.
Backward compatibility is useful if you already have Mul-T-Lock cylinders in a building and want to add doors without rekeying everything.
Side by side
Factor | Medeco | Mul-T-Lock |
Core idea | Angled cuts, restricted and tracked keys | Telescopic pin-in-pin design |
Reputation | North American institutional standard | Strong pick resistance, common in commercial and upscale residential work |
Attack-resistance listing | UL 437 | UL 437 |
Master keying | Supported through its key programs | Extensive on MTL800 |
Retrofit range | Widest catalog for major U.S. commercial lock bodies | Broad, with MT5+ compatibility on MTL800 |
Key control | Program-based, with tracked blanks | Exclusive keyways, patent-based control |
Treat the table as a starting point. Specific models within each brand vary, and your locksmith should confirm which model fits your door.
Picking, drilling and the evidence
You will see confident claims online about which brand wins the picking contest or survives a drill longer. Some pages quote minutes for each. We would not make a purchase on those figures, because the testing conditions behind them are rarely published and they come from sellers with a preference.
Here is what holds up better:
Both brands are listed to UL 437, the recognized standard for attack resistance of key locks.
In one independent product test, Consumer Reports found that drilling the Medeco Maxum ruined the lock, but testers were still denied access.
Any mechanical lock is theoretically open to a skilled person with specialized tools and time. High-security cylinders raise the time, skill and noise required. They do not make a door impossible to open.
For a home or small shop, that last point is the practical one. Burglars mostly look for the easy door. A high-security cylinder, a reinforced strike plate and a solid door frame together push most attempts elsewhere. A cylinder alone does not.
Key control: the reason most people upgrade
Picking is the attack people picture. Unauthorized key copies are the attack that actually happens: the former employee, the contractor, the ex-tenant, the lost key that turns up months later. Restricted keyways are usually more valuable than pick or drill resistance, because they remove that most common vector. That is also the view in one industry supplier’s comparison.
How Medeco handles duplicates
Medeco uses restricted key blanks and tracks them. Which duplicates you can order depends on the program chosen: a designated provider and signature card, the facility’s own procedures, or a factory signature. One Medeco product document from ASSA ABLOY USA states that Medeco3 keys may be duplicated only by Medeco or an authorized Medeco service outlet, and only at the customer’s request.
How Mul-T-Lock handles duplicates
Mul-T-Lock’s MTL800 pairs its triple-locking mechanism with what the maker calls superior key control and extensive master-keying capabilities. Some comparison pages say Mul-T-Lock makes duplication more rigorous than Medeco. Others say the reverse. In reality the answer depends on which program and which dealer agreement is attached to your keys, so ask the locksmith to put the exact duplication rules for your specific cylinder in writing.
Questions to settle before you buy
Who is authorized to order extra keys, and how is that person verified?
Is there a signature card, letter of authorization or account, and who holds it?
What happens if the authorized person leaves the company or sells the property?
How long does a replacement key take to arrive?
That last question matters more than people expect. Restricted keys are not same-day items from a shelf, so keep a spare in a safe place.
Fit and retrofit: check the door first
Before you compare brands, compare the hardware. On commercial doors, Medeco has the widest retrofit catalog for major U.S. commercial lock bodies, which is a real advantage when you want to keep existing locksets and swap only the cylinders. Mul-T-Lock fits many common bodies too, and its MT5+ compatibility helps in buildings that already run that system.
What to check on your side:
Cylinder type. Mortise, rim, profile, interchangeable core, or the standard cylinder inside a residential deadbolt each need a matching product.
Door thickness and bolt condition. A hardened cylinder sits in a bolt and a latch. If the deadbolt is worn or the door is hollow and thin, upgrade those as well.
Strike plate and frame. Kick-ins target the frame, not the cylinder. Long screws and a reinforced strike are inexpensive and effective.
Existing keying. If you run a master key system with several doors, mixing brands creates headaches. Staying with one system keeps the key hierarchy clean.
For property managers and business owners thinking beyond a single door, the cylinder is one layer. A broader view of securing a business perimeter covers lighting, monitoring and access control around the building, and it pairs well with a properly keyed set of locks on the doors themselves.
What about Abloy?
People searching this comparison often ask about Abloy too. Abloy cylinders use a rotating-disc design rather than traditional pins, which is a different engineering approach from both Medeco and Mul-T-Lock, and the line is often considered for harsh weather and heavy-use openings. We have not found an independent test we would cite to rank it against the other two, so we would not call a winner. If you are weighing Abloy, treat it as a third candidate and ask your locksmith about parts availability, key-control terms and which models fit your door.
Pricing and what a quote should include
We cannot give you a Delaware price for these cylinders in a blog post, and you should be wary of any page that does without a source. List prices change. Medeco’s own U.S. price book states that prices are subject to change without notice and not guaranteed without an official quotation. That is the right standard to hold any quote to.
A proper written quote for a high-security upgrade should list:
The exact brand, product line and model for each cylinder.
The key program: how many keys are included and what extra keys cost.
Whether the cylinders are keyed alike, keyed different or part of a master system.
Labor, trip charge and any hardware that has to be replaced (latch, strike, deadbolt body).
Lead time for restricted keys and cards.
Warranty terms for the product and for the installation.
If a caller quotes a surprisingly low flat number over the phone without asking about your door, that is a warning sign. High-security work depends on the door, the cylinder type and the key program, so an honest price starts with a few questions.
Which one should you choose?
There is no universal winner. A few patterns help:
A single home or small office that wants strong key control and simple fit. Either brand can work. Pick the one your locksmith can support locally, with spare keys and parts quick to get.
A multi-door business, landlord or property manager with changing staff or tenants. Put key control and master-key design first. Medeco’s retrofit range and Mul-T-Lock’s master-keying on MTL800 are both strong, so decide on the program terms and who administers them.
A building already running one system. Stay with it unless there is a reason to switch.
A high-risk door (storage for valuables, pharmacy, cash room). Combine a high-security cylinder with a reinforced door, frame and, where appropriate, alarms or access control.
Above all, choose a locksmith who will explain the tradeoffs rather than push a single brand.
Our perspective
We install and service a wide range of locks across Delaware, from emergency lockouts to master key systems and access control, and we are a mobile team that comes to you. In our experience the conversation about Medeco versus Mul-T-Lock is usually the wrong first conversation. The first one should be: who has keys right now, and who should not?
Many customers call after a tenant moves out, an employee leaves or a key goes missing, and they want the strongest lock on the market. Often the better first step is rekeying, which makes lost or unreturned keys useless at a fraction of the cost of replacing hardware. Our own guide on whether to rekey or replace locks explains that decision, and our rekeying overview for Delaware covers how it works. When a restricted-key system really is the right answer, such as for a landlord with many units or a business with turnover, we design the key plan before we choose the cylinder.
We would also rather tell you the honest limits. No cylinder is unpickable, and a weak frame defeats a strong lock. We do not publish flat prices for high-security work, because the right quote depends on your door and your key program. We will give you an itemized, written one.
— Brian
Get a high-security upgrade quoted in Delaware
If you are comparing high-security cylinders for a home, rental or storefront, our mobile team can look at the door, check the existing hardware and explain your options before you commit. We handle high-security locks, master key systems and access control for businesses, as well as residential upgrades, rekeying and smart locks. See everything we do on our locksmith services page, or contact us for a written quote. We work with local ownership and direct communication, so you talk to the people doing the work.
FAQ
Is Medeco better than Mul-T-Lock?
Not across the board. Both carry UL 437 listings, and both are major upgrades over standard cylinders. Medeco is strongest where you want the widest retrofit range on U.S. commercial lock bodies, while Mul-T-Lock stands out for its telescopic pinning and master-keying on MTL800. Key-control terms and local support usually decide it.
Can a locksmith open a Medeco lock?
Sometimes, and it depends on the model, the condition of the lock and the locksmith’s training and tools. High-security cylinders are built to resist picking and drilling, so a trained locksmith may need a non-destructive method specific to that cylinder or may have to drill and replace it. If you are locked out of a high-security door, tell the locksmith the brand before they arrive, and be ready to show proof that you are authorized to enter.
Can I get extra keys copied at a hardware store?
Usually not for restricted systems. Medeco’s catalog explains that its restricted keys are tracked and cut on special machines, and a Medeco product document says certain keys may be duplicated only by Medeco or an authorized service outlet. Expect a signature card or authorization step, and expect to wait for delivery.
Which is better, Abloy or Medeco?
They are built differently, with Abloy using rotating discs rather than pins, so the better choice depends on your door, your hardware and the key-control program you want. Ask a locksmith which models are available locally, how replacement keys are handled and which one fits your existing cylinders.
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