Mul-T-Lock is the other end of the high-security spectrum from Medeco - Israeli engineering, telescoping pin system, and a track record on the toughest commercial and coastal-residential PSL accounts. We install MT5+ deadbolts, Hercular padlocks for marine and warehouse use, and Interactive+ on the higher-security PSL business work. Restricted keyway - cuts only by authorized dealers like us.
Mul-T-Lock locksmith in Port St. Lucie - authorized dealer for Mul-T-Lock MT5+, Hercular padlocks, MTL400 series, Interactive+. Restricted-keyway high-security install, rekey, and authorized key cutting.
Heavy presence on Florida coastal commercial (Treasure Coast plazas, marine / boat-yard accounts) and high-security residential where pick + bump + drill resistance is non-negotiable.
Mul-T-Lock keys are not duplicable at kiosks or non-authorized locksmiths - that is the protection. We cut authorized copies on-site with keyholder permission.
Mul-T-Lock customers in PSL are usually people who already understand high-security and asked for it specifically. The patented MT5+ keyway (patent protection through 2034) is the current top of the line: telescopic pin technology, alpha spring inside the key, three independent security elements. Most homeowners with MT5+ in PSL have it on a Tradition or PGA Verano front door, a beachfront Hutchinson Island main entry, or a small commercial property where the owner specifically wanted "the lock the consulate uses."
The pain point: they have the locks, they have one key, and they need a second or third copy. Big-box won't touch it. Mall kiosk laughs at it. The Mul-T-Lock distributor in Miami quotes a 7-10 day turnaround and a $60 cut fee plus shipping. We cut Mul-T-Lock MT5+, Interactive+, and Junior keys on-site in PSL with the proper authorization.
The commercial pain point: a fleet yard, storage facility, or contractor outfit with twenty Mul-T-Lock HyperLink padlocks, all keyed alike, and they need them re-keyed because an employee left with keys. Or an ENTR smart lock has dropped its Bluetooth pairing and the customer is locked out of the app but the mechanical key still works.
We service Mul-T-Lock MT5+, Interactive+, Junior, HyperLink padlocks, and ENTR smart deadbolts in PSL. Cut authorized restricted keys on-site, rekey commercial padlock fleets, troubleshoot ENTR Bluetooth pairing. Call (772) 284-5142.
Mul-T-Lock MT5+ restricted keys cut in-van with your platinum signature card or registered-keyholder permission. No 7-10 day Miami distributor wait.
MT5+ patent protection runs until 2034, meaning unauthorized key duplication is legally restricted nationwide. Real key control, not just marketing.
Mid-tier Interactive+ and entry-level Junior cylinders on the van for upgrades where MT5+ is overkill but Schlage Primus isn't enough.
Per cylinder, includes on-site cut keys and authorization registration. Hardware ($180-340 per cylinder MSRP).
Fleet yards, storage facilities, contractor outfits with 10-50+ HyperLink padlocks rekeyed to a new master in one visit.
ENTR app pairing lost after phone upgrade or factory reset? We re-pair the smart module and re-share with authorized users.
Mul-T-Lock is the brand customers ask for by name when they've done the research. It's also the brand most PSL locksmiths can't cut keys for because the restricted distribution is tight and the cutting equipment is specific. We are equipped, authorized, and stock the cylinders.
Owning the install is easy. Owning the cutting equipment for the MT5+ telescopic pin profile is what separates an authorized Mul-T-Lock locksmith from a generic one. We have both.
Mul-T-Lock keys are restricted by platinum card. We have the customer registration process running smoothly so you walk away with your additional keys today, not after a 10-day mail-in.
Twenty HyperLink padlocks back to the factory takes weeks. We rekey them in your yard in one afternoon with a new master and document the bitting.
ENTR is Mul-T-Lock's smart-lock line. We've done enough of these in PSL to know the Bluetooth pairing quirks, the phone-OS upgrade re-link sequence, and the mechanical-key bypass when the app stalls out.
Mul-T-Lock's catalog centers on the telescoping pin tumbler - pins inside pins, each with their own internal pin chamber. The system creates a far higher number of possible key cuts and resists picking by requiring simultaneous correct setting of pin and inner pin.
Mul-T-Lock MT5+. The current flagship cylinder. Telescoping pins + alpha pins + side-bar elements. Restricted territory - we are an authorized MT5+ dealer for PSL and the Treasure Coast. Used on high-security PSL residential (waterfront Hutchinson Island, PGA Verano top tier) and commercial. The MT5+ key is the iconic Mul-T-Lock dimpled key with paracentric grooves.
Mul-T-Lock Interactive+. The original Mul-T-Lock high-security line, predating MT5+. Still widely deployed and serviced. Telescoping pins + a movable element in the key that interacts with the cylinder. Restricted keyway. We rekey, service, and cut authorized copies for Interactive+ systems that were installed years ago and are still running.
Mul-T-Lock MTL400. Mid-tier restricted cylinder - higher than standard but below MT5+. Used in some PSL multi-family and small-commercial where the budget does not justify MT5+ but key control is still wanted. Cuts authorized only.
Mul-T-Lock Hercular padlock. Heavy-duty padlock built around a hardened steel body, boron-carbide shackle, and the MT5+ or Interactive+ cylinder. The Hercular is the padlock for PSL marine, boatyard, warehouse, gate, and high-value commercial applications. We service the Marina at Sandpiper Bay, several Stuart boatyards, and the Treasure Coast self-storage facilities using Hercular padlocks.
Mul-T-Lock TopGuard / Cronus deadbolt body. Mul-T-Lock's residential and commercial deadbolt body. Hardened steel anti-saw insert, anti-drill plates, the MT5+ or Interactive+ cylinder. Grade 1 ANSI. The actual answer when 'high-security deadbolt' has to mean what it says.
Mul-T-Lock Junior cam locks. Cabinet, file, and equipment cam locks with restricted keyway. Used by PSL medical, legal, and pharma offices that want chain-of-custody on cabinet keys without the cost of CLIQ programmable.
Florida coastal corrosion resistance. Mul-T-Lock's brass and stainless cylinder bodies and Hercular padlock construction hold up to PSL salt air better than most. We have Hercular padlocks on boatyards in Stuart and Jensen Beach that are 10+ years out and still functional. For coastal applications, this matters more than the marginal pick-resistance differences between high-security brands.
Hercular for marine / boatyard / dock-box use. The Hercular padlock is widely regarded as the best-in-class padlock for coastal marine use. PSL and Stuart boatyards, the docks at Sandpiper Bay, and the storage applications at the marinas all use Hercular. We are the local authorized service for these.
Telescoping pin pick resistance. The pin-inside-a-pin system is mechanically different from Medeco's angled-pin approach and is widely considered the most pick-resistant mainstream mechanical cylinder system. Demonstrated picking attacks on MT5+ in security-research settings exist but require specialized tools and hours of attempt time - not relevant to any real-world burglary.
Restricted keyway. Same protection model as Medeco - blanks distributed only to authorized dealers, signature-card keyholder system, no key copies at kiosks or non-authorized locksmiths. The system works because the supply chain works.
PSL use cases where Mul-T-Lock is the right pick. Coastal marine applications (Hercular padlocks), high-value waterfront residential (MT5+ deadbolts), multi-tenant commercial where one-key-per-tenant matters (Interactive+ master systems), self-storage facilities, and pharma / medical cabinet locks (Junior cam locks).
Mul-T-Lock vs Medeco honest comparison. Both are at the top of the residential / commercial high-security market. Differences: (1) Mul-T-Lock has the better padlock line (Hercular) - Medeco's padlocks are good but Hercular is heavier and built for marine; (2) Medeco has the better mass-market commercial mortise retrofit (M3 cylinders drop into more existing bodies); (3) Mul-T-Lock MT5+ is generally considered the more pick-resistant cylinder; (4) pricing is similar within $50-100 per door. We install both and tell you which fits the use case.
| Service | Typical Price | Notes |
|---|---|---|
| Mul-T-Lock MT5+ cylinder install (retrofit) | $200 - $300 | Plus MT5+ cylinder ($160-280). |
| Mul-T-Lock TopGuard deadbolt install (full unit) | $240 - $380 | Plus TopGuard hardware ($260-460). |
| Mul-T-Lock Interactive+ cylinder install | $180 - $280 | Plus Interactive+ cylinder ($140-240). |
| Mul-T-Lock Hercular padlock supply + service | $220 - $480 | Padlock body + cylinder + on-site service. |
| Mul-T-Lock rekey (per cylinder, authorized) | $50 - $90 | Authorization required. |
| Mul-T-Lock authorized key cut (MT5+ / Interactive+) | $30 - $65 | Per key, on-site, with authorization. |
| Mul-T-Lock Junior cam lock install | $80 - $160 | Plus cam-lock hardware. Cabinet / drawer. |
| Decision | Doctor Lockout (authorized) | Non-authorized locksmith | Big-box / kiosk |
|---|---|---|---|
| Cuts authorized MT5+ / Interactive+ keys | Yes (with authorization) | No (cannot get blanks) | No |
| Installs new Mul-T-Lock restricted systems | Yes | No | No |
| Hercular padlock service (coastal marine) | Yes | Limited (no parts) | No |
| UL 437 high-security install | Yes | Limited to non-restricted brands | No |
| Coastal corrosion expertise | Yes (we run these jobs) | Varies | N/A |
Real person on the phone in under 2 rings. Locksmith on-site in 15-30 minutes. Honest price before any tools come out.
Call (772) 284-5142Mul-T-Lock MT5+ TopGuard deadbolt install runs $500-840 all-in per door (install plus hardware). Comparable Schlage B660 Primus deadbolt install runs $300-500 all-in. Mul-T-Lock is roughly 1.6-2x the price of Schlage high-security. The trade-off: MT5+ is generally considered more pick-resistant, has tighter key-control through the restricted dealer system, and the Hercular padlock line is best-in-class. For ordinary PSL residential, Schlage B660 is enough; for coastal marine, jewelry, or top-tier residential, Mul-T-Lock earns the price difference.
No. Mul-T-Lock MT5+ and Interactive+ key blanks are distributed only to authorized Mul-T-Lock dealers and cannot be obtained at consumer retail. That is the protection - the restricted supply chain. We are an authorized dealer for PSL and the Treasure Coast and cut authorized copies on-site, $30-65 per key, with the keyholder's signed permission.
Yes if you run a boatyard, dock-box, or PSL marina application. Hercular is built around a hardened steel body, boron-carbide shackle, and MT5+ or Interactive+ cylinder. We have Herculars on PSL and Stuart boatyards 10+ years out, still functional, still under their own warranty. Generic padlocks corrode out in 2-4 years in marine air. The math works out for any application where the cost of theft exceeds the padlock differential.
Show up with the registered keyholder, signed authorization from the keyholder, or both. The registered keyholder signs a card when the system is set up. To cut copies, the request matches an active keyholder. If the system was set up by a different dealer or owner who is no longer available, your options are (1) trace the original dealer and request release, or (2) rekey the system to a new Mul-T-Lock master that you become the registered keyholder for. We walk through both.
In real-world conditions, effectively no. The telescoping pin system (pins inside pins, each with their own internal chamber) requires simultaneous correct setting at both levels and defeats every conventional picking technique. Demonstrated attacks exist in security-research conferences but require specialized tooling, hours of attempt time, and conditions that do not apply to a normal burglary. For PSL practical purposes, MT5+ is pick-immune.
MT5+ is the current flagship - telescoping pins plus alpha pins plus side-bar elements. Interactive+ is the older generation - telescoping pins plus a movable element in the key. MT5+ has higher pick resistance and the more current factory support. Interactive+ is still serviced, still has key blanks available, and is widely deployed across PSL systems installed 10-20 years ago. For new installs we recommend MT5+; for existing Interactive+ systems we service in-place.
Mul-T-Lock work concentrates at PSL and Stuart marina / boatyard accounts (Sandpiper Bay marina, Jensen Beach boatyards, Stuart waterfront), self-storage facilities, jewelry and high-value retail, and waterfront residential along Hutchinson Island and the Indian River frontage. PGA Verano top-tier residential. Pharma / medical cabinet locks across the PSL medical corridor.
Last updated: 2026-05-18
