High security lock installation in Bucks County, PA
Residential and commercial
Restricted key systems
Medeco, Mul-T-Lock, ASSA ABLOY
Licensed and insured
Your neighbor’s house was broken into last month. The police report said the door was forced. You looked at your own front door lock afterward and realized it is a builder-grade deadbolt that has been there since 2009.
Or you watched a video that showed someone opening a standard deadbolt with a bump key in under five seconds and now you cannot stop thinking about the lock on your back door.
Or you run a business and a manager left six months ago. The key came back, but you have no way to verify it was not copied first, and a restricted key system would have meant that copy was impossible without your authorization.
High security locks exist for exactly these situations. They are engineered to resist the attack methods that defeat standard locks, and they give you control over key duplication that standard keyways cannot provide. Doylestown Locksmith installs high security lock systems for homes, offices, retail properties, and commercial facilities throughout Bucks County.
Call 267-440-6484 or request a free quote to discuss what your property needs.
What standard locks cannot do
A Grade 2 or Grade 3 deadbolt from a home improvement store will stop someone from walking through a door. It will not stop someone who knows what they are doing.
Bump keys are widely available and work on most standard pin tumbler cylinders. A bump key inserted into the lock and struck lightly causes the pins to jump momentarily, allowing the cylinder to rotate. The whole process takes a few seconds and leaves no sign of forced entry. Standard locks are almost universally vulnerable to it.
Lock picking requires more skill but is effective against standard cylinders. Picking tools are inexpensive and legal to own. A lock that has never been tested against a pick set is almost certainly pickable by anyone with basic training.
Drilling is slower and more destructive but works when picking and bumping fail. Standard lock cylinders have no meaningful resistance to a drill bit once it contacts the shear line.
Key duplication is the quieter vulnerability. A standard key can be copied at any hardware store or self-service kiosk in under two minutes, with no ID, no verification, and no record. For homeowners who have had contractors, housekeepers, or previous tenants with access, there is no reliable way to know how many copies exist or where they are.
High security locks address all of these. Not by making unauthorized entry theoretically impossible, but by making it difficult enough and slow enough that most attempts fail or are abandoned.
What actually makes a lock high security
The term gets used loosely, so it is worth being specific about what the hardware actually does differently.
Pick and bump resistance
High security cylinders use pin configurations that do not respond to standard bumping. Medeco cylinders use rotating pins with angled keyways that require both vertical and rotational movement to align, which bump keys cannot replicate. Mul-T-Lock uses a telescoping pin system with an additional inner pin layer that adds a second line of resistance to picking. These are not marketing claims, they are mechanical designs that have been independently tested and certified.
Both Medeco and Mul-T-Lock hold ANSI Grade 1 ratings and UL listings for pick and drill resistance. The certification process involves sustained attack testing under controlled conditions. A Grade 1 rating on a standard deadbolt means the lock body is structurally sound. The same rating on a Medeco or Mul-T-Lock cylinder means the cylinder has been specifically tested against picking, bumping, and drilling.
Drill resistance
High security lock cylinders contain hardened steel inserts at the shear line that deflect or destroy drill bits before they can reach the pins. Some systems also include anti-drill plates behind the cylinder face. A standard deadbolt cylinder typically contains no anti-drill material beyond the brass or zinc of the housing itself.
Restricted keyways and key control
This is the component that matters most for anyone managing employee access, rental properties, or any situation where key copies are a security concern.
Restricted key systems use proprietary keyway profiles that are protected by active patents. The key blank for a Medeco or Mul-T-Lock system cannot be purchased at a hardware store, a key kiosk, or most locksmith shops. Copies can only be cut at authorized dealers with documentation confirming the requester is an authorized key holder on record. If a key leaves your control, you know it cannot be duplicated without your authorization.
For a business owner with employee turnover, this changes the security equation significantly. With a standard keyway, every former employee with a copy of the key is a potential vulnerability indefinitely. With a restricted keyway system, the only question is whether the physical key was returned, not whether copies exist somewhere.
For situations where key management is the primary concern rather than physical attack resistance, access control installation is worth comparing. Access control replaces the key with a credential you can revoke instantly, with no physical key to track. We can help you determine which approach fits your situation during an assessment.
Who gets high security locks and why
Homeowners upgrading from builder-grade hardware
Most new construction in Bucks County ships with Grade 2 or Grade 3 deadbolts selected for cost, not security. They meet the minimum requirement for the door and nothing more. Homeowners who have researched what their current lock actually resists, or who have had a security incident in the neighborhood, frequently want to upgrade without replacing the entire door or moving to a smart lock system.
A high security deadbolt in Medeco or Schlage Primus drops into the same footprint as a standard deadbolt on most doors. The door does not need modification, the installation looks identical from the outside, and the security profile changes substantially. For homeowners who want the upgrade without eliminating the physical key entirely, this is the right direction. For those considering going keyless, our smart lock installation service covers that option.
Businesses with key control concerns
A retail operation, medical office, or professional services firm with any history of employee turnover has a key management problem whether they know it or not. Standard keys have been copied, distributed informally, and left in circulation long past the tenure of the employees who held them. A restricted keyway system establishes a clean baseline: a documented chain of custody for every key, and the assurance that no unauthorized copies exist or can be made.
We install restricted key systems as standalone upgrades on existing commercial doors, and we can coordinate them with master key systems so the restricted keyway functions across multiple access tiers in the same building. A manager key that opens everything, department keys that open designated areas, and a documented record of who holds what.
Landlords and property managers
For landlords managing multiple units or a building with regular tenant turnover, the question of key copies is chronic. Rekeying between tenants is the standard solution, but rekeying a standard lock does not prevent the next tenant from copying the new key before they move out. A restricted keyway means the copy problem is solved at the system level, not managed visit by visit. Our lock rekeying service remains a practical option when the existing hardware is in good condition and a full upgrade is not in the immediate budget.
Brands we install
We work with the hardware brands that hold real certifications and have documented performance histories, not marketing-grade security claims.
Medeco is the benchmark for residential and light commercial high security in the United States. Their cylinders use a patented rotating pin design that resists bumping and picking at a mechanical level, not just through tighter tolerances. The restricted keyway has been under patent protection for decades, and their authorized dealer network is controlled tightly enough that key control is genuinely enforceable.
Mul-T-Lock uses a telescoping pin system with a patented inner core that adds a second challenge layer to picking. Their restricted keyway systems are widely specified for commercial applications where key control across a large employee population is the primary requirement. They are also the brand most commonly specified by security consultants for facilities with high-value assets.
ASSA ABLOY covers a broad range of commercial security hardware, including high security cylinders under the ASSA brand and commercial door hardware across the full ABLOY line. For commercial properties that need high security cylinders integrated into a broader access hierarchy, ASSA products are a frequent specification.
Schlage Primus is the high security line within the Schlage family and the most common upgrade path for homeowners who already have Schlage hardware on their doors. Primus uses a sidebar mechanism in addition to standard pins, adding a secondary challenge that standard lock picks and bump keys do not address.
We recommend the right brand based on your door type, your existing hardware, your key control requirements, and your budget. We do not recommend one brand across every situation.
How the installation works
- Security assessment: We inspect the door, frame, hinge condition, and existing hardware. We look at what the current lock resists and where the gaps are. If the door frame is weak or the strike plate is held by short screws, the best cylinder in the world will not help, and we address that as part of the installation.
- System selection: We recommend the right hardware based on your property type, your security concerns, and your key control requirements. If key control is the priority, we walk through the restricted keyway options. If physical attack resistance is the concern, we focus on cylinder ratings. If both matter, we find the system that addresses both.
- Installation: Most high security deadbolts drop into the same door prep as standard deadbolts. No new drilling is required in most cases. For cylinders being added to existing commercial hardware, we assess compatibility before we start. We install the hardware, align the bolt with the strike, and verify smooth operation with the new key.
- Key control setup: For restricted key systems, we document the initial key issuance and establish the authorization protocol so you know exactly what is required to obtain additional copies. We provide you with the documentation you need to manage the system going forward.
- Final testing: We test the lock through multiple cycles with each key issued, verify the bolt extends and retracts cleanly, and confirm the cylinder is properly set. We do not leave until the hardware functions correctly and you know how to use it.
Common questions about high security locks
Is a high security lock worth the cost over a standard Grade 1 deadbolt?
It depends on why you are upgrading. A standard ANSI Grade 1 deadbolt like the Schlage B60N is a solid lock that resists kick-in and is reasonably difficult to pick. If your primary concern is forced entry through the door, a Grade 1 deadbolt with a reinforced strike plate, covered on our deadbolt installation page, addresses most residential scenarios at a lower cost.
High security locks make the most sense when bump resistance, pick resistance, and key control all matter. For a homeowner who wants maximum physical security on a front door, or a business owner who needs to know with certainty that key copies cannot be made without authorization, the upgrade is justified.
Can restricted keys really not be copied anywhere?
At authorized dealers with active patents, yes. The key blank for a Medeco or Mul-T-Lock system is not available at hardware stores or key kiosks. Cutting a copy requires the correct blank and a cutting machine calibrated for that keyway, both of which are controlled through the manufacturer’s dealer network. The system is not theoretically unbreakable, but unauthorized duplication requires equipment and access that is genuinely difficult to obtain.
Can you install a high security cylinder on my existing lock hardware?
In many cases, yes. Many high security cylinders are available in standard formats that retrofit into existing deadbolt housings or commercial mortise locks. We assess compatibility during the site visit. If your existing hardware cannot accept a high security cylinder directly, we will tell you and explain the options.
What is the difference between high security locks and access control?
High security locks use a physical key with better attack resistance and key control. Access control replaces the key with a digital credential, card, fob, or smartphone, that can be revoked instantly with no physical key to track. High security locks are the right choice when you want to keep a key-based system and strengthen it. Access control is the right choice when the key management overhead itself is the problem. For many commercial properties, the answer is both: high security cylinders on doors where a physical key is appropriate, and access control where revocability and logging matter more. See our access control installation page for how that works.
Do high security locks work with smart home systems?
Some do, and the compatibility depends on the specific hardware. Schlage Primus cylinders can be paired with compatible smart lock bodies in some configurations. For homeowners who want both high physical security and smart home integration, we assess the options during the consultation. See our smart lock installation service for the full range of smart lock options we install.
Ready to upgrade your locks?
Call 267-440-6484 or request a free quote online. We serve Doylestown, Warminster, Warrington, Chalfont, New Britain, Furlong, Jamison, Richboro, Montgomeryville and all of Bucks County.