Deadbolt Locks
Deadbolt Locks
Deadbolt locks provide a higher level of security than standard locks, which are generally unreliable for securing a home or business. These locks exist as an added level of protection against break-ins that cannot easily be breached through forced entry; they are, therefore, of special interest to those who want more protection against any illegal invasion on their premises. Deadbolt locks are operated with either a key from outside or a thumb-turn from inside. This makes them less vulnerable to illegal entry with the torch-light trick most commonly used by burglars.
At Locksmith Guaranteed, we encompass the installation, repair, and upgrading of deadbolt locks to optimize the security of undercover property. If you need a new deadbolt installed or an existing deadbolt reinforced, we can assist you with our fully equipped team of locksmiths.
What is a Deadbolt Lock?
A Dead Lock Mechanism is a commonly used locking device that uses a solid metal bolt on the door frame, which makes the door more secure than a simple latch. Deadbolts have been just a straight bar of metal projecting into the door frame and are unable to be forced open because they extend into the door frame. Since deadbolts don’t use a spring mechanism operating on a rotation principle based on a key, they are less susceptible to picking, bumping, or being forced open.
✔ Single Cylinder Deadbolt – Operated with a key from the outside and a thumb turn from the inside.
✔ Double Cylinder Deadbolt – Requires a key for both sides, offering extra security but requiring a key for exit.
✔ Vertical Deadbolt – Mounted on the door’s surface to resist prying and force attacks.
✔ Smart Deadbolt – Allows keyless entry via codes, Bluetooth, or Wi-Fi for modern convenience.
Why Go For a Deadbolt Lock?
🔹 Enhanced Security – Deadbolts are much stronger than traditional locks, offering resistance against forced entry.
🔹 Burglary Prevention – A majority of break-ins involve forced door entry, and deadbolts make this much more difficult.
🔹 Versatile Application – Residential homes, condos, and commercial properties.
🔹 Cost-Effective Protection – An affordable and easy upgrade for better protection.
Need Help Regarding Deadbolt Locks?
Deadbolt Lock Installation and Repair in Maryland
Professional deadbolt installation, replacement, and repair for residential and commercial properties across Montgomery County and Prince George’s County.
Call (240) 931-0762 Get a Free QuoteA deadbolt is the primary mechanical barrier between your door and forced entry. Unlike a spring latch, which can be bypassed with a credit card or shimming tool, a deadbolt extends a solid steel bolt into the door frame and holds it there without a spring mechanism. To retract it, you need the correct key or thumb turn. This makes deadbolts significantly more resistant to the most common forced entry methods, including kicking, prying, and shimming.
Most homes in Maryland were originally fitted with builder-grade deadbolts during construction. These locks carry an ANSI Grade 3 rating, the lowest classification in the residential scale, and are designed to meet minimum code rather than provide meaningful security. Over time, the internal pins wear down, the cylinder becomes gritty, and the bolt throw may no longer engage fully with the strike plate. At that point, the lock provides the appearance of security without much of the substance.
At Locksmith Guarantee, we install, replace, and repair deadbolts for residential and commercial properties across Maryland. Every job includes a check of the door alignment and strike plate condition, because a properly installed deadbolt on a misaligned door is still a compromised entry point.
ANSI Grade Ratings Explained
The American National Standards Institute rates residential and commercial locks on a three-grade scale. Grade 1 is the highest classification and is required to withstand 10 door strikes of 75 pounds and 250,000 key cycles without failure. It offers the best resistance to picking, drilling, and forced entry. Grade 2 is a moderate rating suited for interior doors and lower-traffic applications. Grade 3 is the minimum standard and is what most builder-grade hardware meets. For any exterior door in a Maryland home or business, Grade 1 is the baseline we recommend.
Installing a deadbolt correctly involves more than drilling a hole and mounting hardware. The bolt throw depth, strike plate placement, screw length, and door-to-frame alignment all affect how well the lock actually performs. A deadbolt installed on a door that has settled out of square will feel stiff, wear reliableer, and may not fully engage the strike plate. Our residential locksmith team checks the door condition before and after installation.
One of the most frequently overlooked parts of a deadbolt installation is the strike plate. Most residential strike plates come with short screws that anchor only into the door casing, not the structural framing behind it. A kick-in attack transfers force directly to those screws, and short ones pull free efficiently. We install strike plates with 3-inch screws that reach the wall stud, which significantly increases the resistance of the door to a forced kick regardless of the deadbolt grade.
For homeowners across Montgomery County and Prince George’s County moving into previously owned homes, we also offer a combined deadbolt replacement and rekey service that addresses both the hardware condition and key accountability in a single visit.
Not every deadbolt issue requires a full replacement. Many problems can be resolved with a targeted repair that restores the lock to proper function without the cost of new hardware. We diagnose and repair the following deadbolt issues.
| Problem | Likely Cause | Our Solution |
|---|---|---|
| Stiff or hard-to-turn cylinder | Worn internal pins, dry cylinder, or door misalignment preventing smooth bolt travel | Lubricate and assess cylinder wear; adjust door or strike plate if misalignment is the cause |
| Bolt does not extend fully | Strike plate misaligned with bolt hole, or internal actuator worn | Reposition strike plate or replace actuator component |
| Key turns but bolt does not move | Broken cam or tailpiece inside the cylinder connecting key rotation to the bolt | Replace cylinder or internal cam assembly |
| Bolt retracts but does not hold | Worn spring or detent mechanism allowing bolt to creep back under pressure | Replace spring assembly or full cylinder depending on extent of wear |
| Key difficult to insert or remove | Worn keyway pins, debris in cylinder, or key worn down on one side | Clean and lubricate cylinder; rekey if pin wear is causing binding |
| Lock damaged after forced entry attempt | Cylinder punched, drilled, or otherwise compromised during break-in | Full lock change with strike plate and frame inspection |
Commercial deadbolts serve different demands than residential ones. Entry doors at offices, retail locations, and facilities see far higher daily use, and the hardware needs to match that load. We install commercial-grade deadbolts rated for high-cycle use, including mortise-style deadbolts and cylindrical deadbolts with hardened steel cylinders.
For businesses that need to manage key access across multiple staff members or departments, we can set up a restricted keyway system alongside the deadbolt installation. Restricted keys cannot be duplicated without authorization, which gives business owners control over how many working keys exist for each door. This pairs well with a commercial master key system where one key opens multiple locks while individual staff keys are limited to specific access points.
For businesses reviewing their overall entry point security, our security consultation service covers deadbolt grade assessment alongside door alignment, strike plate condition, and key accountability as part of a full property review.
| Brand | ANSI Grade | Best For | Key Duplication |
|---|---|---|---|
| Schlage B60N / B62N | Grade 1 | Standard residential exterior doors. Reliable, widely available, solid value. | Standard — duplicable at most hardware stores |
| Kwikset 980 | Grade 1 | Residential use. SmartKey models allow owner rekeying without a locksmith. | Standard — duplicable at most hardware stores |
| Schlage B80 Series | Grade 1 | Commercial and high-traffic residential. Heavier duty construction than the B60 line. | Standard Schlage keyway |
| Medeco Maxum | Grade 1 (High Security) | High-value residential and commercial. Patented keyway, pick and drill resistant. | Restricted — requires authorization for duplication |
| Mul-T-Lock MT5+ | Grade 1 (High Security) | Commercial master key systems and properties requiring strict key control. | Restricted — requires authorization for duplication |
| Schlage Encode / Yale Assure | Grade 1 | Smart deadbolts for app-connected access, temporary codes, and activity logging. | No physical key required; backup key cylinder available |
Door and Frame Assessment
Before touching the existing hardware, we check the door alignment, measure the gap between the door and frame, and inspect the current strike plate and surrounding frame condition. Any issues here affect how we approach the installation and whether additional work is needed alongside the new deadbolt.
Hardware Selection
We confirm the backset measurement (the distance from the door edge to the center of the existing bore), the door thickness, and your preference for finish and security grade. We carry Grade 1 hardware from Schlage, Kwikset, Medeco, and Yale on every service vehicle for same-visit installation.
Removal of Existing Hardware
We remove the old deadbolt and inspect the bore and door edge for any damage or enlargement from previous installations. If the existing bore is oversized, we note this and address it before mounting the new hardware to ensure a solid seat.
Installation and Strike Plate Upgrade
We mount the new deadbolt and replace or reposition the strike plate using 3-inch screws reaching the structural framing. We test the bolt throw, cylinder operation, and thumb turn multiple times before calling the installation complete.
Key Cutting and Handover
We cut your new keys on-site and test each one. For smart deadbolts, we complete the app pairing and code programming before we leave. If you want the new deadbolt keyed to match other locks in the home, we handle that in the same visit.
Locksmith Guarantee provides deadbolt installation and repair throughout Maryland. Our mobile technicians serve the following communities and surrounding areas:
What is the difference between a single cylinder and double cylinder deadbolt?
A single cylinder deadbolt uses a key on the exterior and a thumb turn on the interior. A double cylinder requires a key on both sides, which prevents entry through a broken glass panel but also means you need a key to exit in an emergency. We do not recommend double cylinder locks on primary egress doors.
What ANSI grade deadbolt should I use for my home?
Grade 1 is the highest classification and the one we recommend for all exterior doors in Maryland homes. It offers the best resistance to forced entry, picking, and drilling. Grade 3 builder-grade hardware, which is what most homes were originally fitted with, meets only the minimum standard and is worth upgrading when the opportunity arises.
How do I know if my deadbolt needs to be replaced rather than repaired?
If the cylinder is stiff even after lubrication, the bolt does not extend fully, the lock has been forced or drilled, or the hardware is more than 15 to 20 years old, replacement is usually the better option. Rekeying a worn cylinder does not fix the underlying mechanical issues. Our technicians assess the hardware on-site and give you a clear recommendation before any work begins.
Can you rekey a deadbolt instead of replacing it?
Yes, if the deadbolt is in good mechanical condition. Rekeying changes the internal pin configuration so old keys no longer work and new keys are cut. It is a cost-effective option when moving into a new home or after a key is lost. If the hardware is worn or a lower security grade, we may recommend a full replacement instead.
Do smart deadbolts provide the same physical security as keyed deadbolts?
The physical bolt mechanism on a quality smart deadbolt is equivalent to a standard Grade 1 deadbolt. The security of the bolt depends on the hardware grade, not the electronic component. Smart deadbolts add convenience through app control and temporary codes, but the bolt itself performs the same mechanical function as a traditional keyed deadbolt.
Why does my deadbolt feel stiff or hard to turn?
Stiffness usually comes from a misaligned door that has shifted in its frame, worn internal pins or springs, or a strike plate no longer aligned with the bolt throw. In older Maryland homes, seasonal wood movement and general settling are common causes. We identify the exact cause before recommending a repair or replacement.
From Grade 1 residential deadbolts to high-security commercial hardware, our licensed technicians serve properties throughout Maryland. Written estimates provided before work begins.
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