US Locksmith is a licensed (Lic #00443LK) locksmith company serving all of South Florida since 2004, and an authorized installer of both brands. The Medeco vs Mul-T-Lock decision comes down to two questions: what are you defending against, and who needs to be able to cut a key. Medeco is the stronger choice against a kicked or drilled door and is far easier to service locally. Mul-T-Lock is the stronger choice when you want absolute control over who can cut a key and one key running every opening on the property. Below is how that plays out on real Miami-Dade, Broward and Palm Beach doors.
What Is the Difference Between Medeco and Mul-T-Lock?
Medeco uses pins that must be lifted to the right height and rotated to the right angle before a sidebar releases. Mul-T-Lock uses a telescoping pin-in-pin design, where a pin sits inside another pin and both must set. Both defeat bumping and standard picking. The practical differences are key control, product range and how quickly you can get service.
| Factor | Medeco | Mul-T-Lock |
|---|---|---|
| Mechanism | Angled rotating pins + sidebar | Telescoping pin-in-pin |
| Flagship residential deadbolt | Maxum | Hercular (MT5+) |
| Force resistance | Strongest in class | Very strong |
| Key duplication control | Signature and ID on file | Physical magnetic order card |
| Key appearance | Looks like a normal house key | Immediately recognizable |
| Local parts availability | Widest dealer network | Fewer stocking locations |
| Padlocks, cam locks, gates | Limited range | Full keyed ecosystem |
| Typical installed cost | $250–$450 | $280–$500 |
Which Lock Survives a Forced Entry Attempt Better?
Medeco. The Maxum deadbolt is an ANSI Grade 1 lock built with hardened steel inserts and a one-inch throw, and it is consistently ranked at the top for resistance to kicking, prying and drilling. The Hercular sits just behind it. If your concern is a smash-and-grab through a front door, that gap matters more than any picking statistic.
Forced entry is what actually happens in most South Florida residential burglaries. Covert picking of a high-security cylinder requires skill, tools and time in front of a door in daylight. A shoulder against a hollow jamb requires none of that. This is also why the strike plate and jamb reinforcement matter as much as the cylinder itself — we cover that in our guide to the strongest lock types for residential doors.
From the Field
On a 1960s Coral Gables front door last year, the homeowner had a top-tier cylinder in a door frame with three-quarter-inch screws into soft pine. The cylinder was untouched after the break-in attempt. The jamb was not. A $400 lock in a $4 frame is a $4 door.
Which Key Is Harder to Copy Without Your Permission?
Mul-T-Lock, by a clear margin at the MT5+ level. Duplication requires the physical magnetic order card that shipped with the system. Without that card in hand, an authorized dealer cannot cut a key at all. Medeco protects its blanks by patent and requires ID and a signature against records held by the dealer, which is strong but human-dependent.
That difference decides real cases. A landlord in Boca Raton turning over tenants twice a year, or a business owner who has had keys walk out with a former employee, is buying process control, not metal. If that is your situation, read which high-security keys cannot be duplicated before you choose a platform.
Why Do More South Florida Homeowners Ask for Medeco by Name?
Medeco has been the American high-security standard for over fifty years, and it shows in how customers talk about it. When we quote high-security work, homeowners ask for Medeco by name several times more often than they ask for Mul-T-Lock, and that gap has been consistent for years. Many have seen the name on a bank door, a government building or a utility cabinet long before they needed one at home. Mul-T-Lock usually enters the conversation because we raised it, not because the customer did.
Familiarity is not a security feature, but it is not worthless either. Insurance adjusters, HOA architectural boards and property managers recognize the name and approve it with fewer questions. On a condo association submission in Key Biscayne or Aventura, that can save a round of paperwork.
How Different Do the Two Keys Actually Look?
Very different, and it changes how people carry them. A Medeco key reads as an ordinary house key with cuts along the top edge. A Mul-T-Lock key is unmistakable: dimples drilled into the flat face rather than notches on the edge.
There is a real argument on both sides. A distinctive key advertises that the door behind it is not a hardware-store deadbolt, which deters an opportunist sizing up a building. A plain-looking key attracts no attention at a valet stand, a gym locker or a contractor's key box. Clients who travel or hand keys to staff often prefer the discretion.
Which Brand Can a Locksmith Get Faster in Miami-Dade or Broward?
Medeco, in most cases. More South Florida supply houses stock Medeco blanks, cylinders and deadbolts, so a same-day or next-day replacement is realistic. Mul-T-Lock parts more often come by order, which pushes a lost-key job to two to five business days once the order card is verified.
The supply side is what drives this. Medeco is simply easier for a technician to buy: more distributors carry it, order minimums are lower, and most South Florida shops keep common Medeco cylinders and deadbolts on the truck instead of ordering per job. Mul-T-Lock stock tends to sit with the dealers who have committed to the platform, and that is a shorter list across Miami-Dade and Broward. A brand your locksmith already carries is a brand you get served on faster.
This is the factor homeowners never think about until they need it. Losing the only key to a Mul-T-Lock cylinder on a Friday afternoon is a different weekend than losing a Medeco key. If a lockout would be genuinely disruptive — a rental turnover, a storefront, a home you are about to leave for hurricane season — ask about lead times before you commit to a platform, and always order a spare at installation.
Are There Counterfeit Mul-T-Lock Keys and Cylinders?
Yes, and we see them in the field. The Mul-T-Lock key profile is visually distinctive enough that imitators copy the look. The cylinder arrives with a similar face and a similar key silhouette but without the pin-in-pin internals, the hardened pins or the registered key system that made the platform worth buying.
- The key came with no order card. A genuine MT5+ system ships with one. No card, no system
- The seller was an online marketplace, not a named dealer with a service address
- The price looked like a bargain. Authentic high-security cylinders do not discount to hardware-store levels
- The key blank cuts easily on a standard duplicator — the whole point of the platform is that it cannot
Medeco copies exist too, but far fewer. The angled-cut geometry is harder to fake convincingly, and the plainer key profile is a less attractive target for imitation. If you inherited high-security hardware with a property and cannot document where it came from, the safest move is a fresh cylinder rather than a rekey of the existing lock.
How Much Does Each One Cost Installed in South Florida?
A Medeco Maxum deadbolt runs $250 to $450 installed. A Mul-T-Lock Hercular runs $280 to $500. Retrofit cylinders that drop into existing hardware cost less because there is no new deadbolt body and no door prep. Registered keys are priced per key on both platforms.
| Work | Medeco | Mul-T-Lock |
|---|---|---|
| Grade 1 deadbolt, supplied and installed | $250–$450 | $280–$500 |
| Retrofit cylinder into existing hardware | $150–$300 | $160–$320 |
| Additional registered key | $25–$55 | $35–$70 |
| Keying multiple doors alike (per extra door) | $90–$180 | $95–$190 |
| Small master key system (3–6 doors) | $650–$1,400 | $700–$1,600 |
Door condition drives more of the final number than the brand does. A warped slab, a mortise pocket cut for older hardware, or an impact door with a narrow stile all add labor. We quote after seeing the opening. For a wider view of whether the upgrade pays for itself, see whether high-end locks are worth the investment.
Does Coastal Salt Air Change the Answer?
It changes the finish, not the brand. Locks tested to UL 437 must be built from corrosion-resistant material or carry a finish that survives salt-spray testing, and both platforms meet that. What fails on oceanfront doors is the decorative lacquer over polished brass, usually within two or three seasons.
On doors within a few blocks of the water in Miami Beach, Sunny Isles or Hollywood Beach, we specify satin chrome or a stainless-look finish on either brand and budget for a cylinder service every few years. Inland in Plantation or Weston, finish choice is cosmetic.
Which One Should You Actually Choose?
Medeco vs Mul-T-Lock stops being a hard call once you name the problem you are solving rather than compare spec sheets. Four situations cover most South Florida homes and small businesses:
| Your situation | Choose | Why |
|---|---|---|
| Single-family home, worried about break-ins | Medeco | Best force resistance, fastest local service |
| Rental or property you hand keys out for | Mul-T-Lock | Order card makes unauthorized copies impractical |
| House plus gate, shed, pool cabinet on one key | Mul-T-Lock | Padlocks and cam locks share the keyway |
| Condo mortise door with HOA approval needed | Medeco | Broad retrofit range, name boards recognize |
For a business with staff turnover and several openings, the calculation shifts toward a keyed system rather than individual locks. Our commercial locksmith team designs master key systems on both platforms.
Bottom Line
Choose Medeco if the threat you are protecting against is a forced door, or if fast local parts and key service matter to you. Choose Mul-T-Lock if the threat is an uncontrolled copy of your key, or if you want one key running the house, the gate and the padlocks. Both are a genuine upgrade over a standard cylinder; the wrong choice is a $400 lock in an unreinforced frame. US Locksmith is an authorized installer of both across Miami-Dade, Broward and Palm Beach. Call 1-866-776-6062 for an on-site assessment.
Frequently Asked Questions
Mul-T-Lock MT5+ is harder. Duplication requires the physical magnetic order card issued with the system, so even an authorized dealer cannot cut a key without it. Medeco relies on a signature and ID check against the dealer's records, which is strong but depends on the dealer following it.
Yes. Mul-T-Lock builds cylinders, padlocks and cam locks on the same keyway, so a single registered key can run the front door, side gate, pool equipment cabinet and a storage room. Medeco covers most door hardware well but has a narrower padlock and cam-lock range.
The Mul-T-Lock key profile is visually distinctive, which makes it a target for copies. We regularly see cylinders on South Florida doors that carry the look but not the internal pin-in-pin construction or the registered key system. Buying through an authorized dealer is the only reliable check.
Medeco is usually faster. More local supply houses stock Medeco blanks and cylinders, so a replacement key is often same-day or next-day. Mul-T-Lock replacements typically take two to five business days because the order card has to be verified and the blank ordered.
Both perform well when the right finish is specified. UL 437 requires corrosion-resistant construction or a finish that survives salt-spray testing. On oceanfront doors we specify satin chrome or stainless-look finishes over polished brass for either brand, because brass lacquer fails first in salt air.
Get a High-Security Lock Assessment
We install and service both platforms across Miami-Dade, Broward and Palm Beach County. Licensed (#00443LK), bonded and insured.
Call 1-866-776-6062The attack-resistance testing referenced above is defined in UL 437, the standard for key locks.