Choosing Secure Door Knob Locks and Deadbolts for Your Home

Walk into any hardware store and you will see grades, ratings, and certifications printed on every door knob with lock packaging. ANSI/BHMA grading is the most meaningful standard to know. Grade 1 is commercial-grade, built to withstand the highest cycle counts and impact forces. Grade 2 is residential heavy-duty. Grade 3 is the entry-level category that covers most budget door knobs sold in big-box stores. A Grade 3 lock knob may look identical to a Grade 1 on the shelf, but it can fail under far less force. Always look for the ANSI/BHMA grade printed on the box, not just the brand name or a vague claim like 'heavy duty.'

Two other terms matter: keyed entry and privacy. A door knob with lock and key on the exterior is called a keyed entry function — it requires a key to unlock from outside and a turn button or thumb-turn from inside. A privacy function has no key cylinder at all; it locks with a push or turn button and is intended for interior rooms like bathrooms. For bedrooms, a door knob with lock for bedroom use typically means a privacy function knob, though some homeowners upgrade to a keyed entry function for added security. Knowing the difference before you shop saves a wasted trip back to the store.

A standard door knob lock — even a Grade 1 model — has a spring latch bolt that retracts when the knob is turned. Spring latches can be defeated with a credit card or shim in seconds; this is a well-documented vulnerability, not a trade secret. A deadbolt, by contrast, throws a solid steel bolt into the door frame that does not retract without the correct key or thumb-turn. This is why every residential security standard recommends pairing a deadbolt with your exterior door knob. The knob handles the convenience of day-to-day entry; the deadbolt handles the actual security load.

For even stronger protection, consider a double lock door knob configuration or a double-cylinder deadbolt on doors with glass panels nearby. A double-cylinder deadbolt requires a key on both the interior and exterior, which prevents an intruder from breaking a glass pane and reaching in to unlock the door by hand. Important note: if you install a double-cylinder deadbolt, keep a key accessible to household members at all times for emergency egress — fire safety is a real consideration. A trained locksmith can walk you through the right application for your specific door and layout before any hardware is installed.

If you have spent time researching high-security options, you have likely encountered the term mortise lock. Unlike a cylindrical door knob lock or a standard deadbolt that mounts through a bored hole, a mortise lock is installed into a deep rectangular pocket — the mortise — cut into the door edge. This gives the lock body full structural contact with the door, not just a small cylindrical bore. The result is a mechanism that is significantly harder to kick in, pry, or manipulate because the entire door edge is engaged, not just two small bore points.

Mortise locks are a core specialty for our team at Green Township Locksmith. We install, rekey, and repair mortise locks on both residential and commercial doors throughout Warren County. Because mortise installation requires precise door preparation and the right box strike plate in the frame, this is not a DIY project we recommend attempting without experience. Improper mortise installation can actually weaken a door. If you are considering a mortise lock upgrade — especially on a front entry door or a rental property door in the Green Township area — call us at (973) 457-4482 and we will assess your door and recommend the right hardware before any cutting begins.

Lock quality and terminology vary significantly depending on which country's standards a product was designed for, and understanding this helps you avoid buying hardware that sounds impressive but was not built for North American applications. In the United States, the ANSI/BHMA grading system (Grades 1, 2, and 3) is the primary residential and commercial benchmark, and it is what locksmiths and building codes here in New Jersey reference. Some imported locks carry European or British ratings that do not translate directly — a lock rated to a European standard may perform very differently than a U.S. Grade 1 lock under the same force test.

In the United Kingdom, the primary standard is BS 3621, which governs thief-resistant key-operated deadlocks. UK locks conforming to BS 3621 are commonly required by insurance companies there, and they often feature double-throw deadbolts and anti-drill, anti-pick, and anti-saw protections as baseline requirements. Many U.S. homeowners who research lock security online encounter UK-centric advice that recommends five-lever mortise locks — a configuration common in Britain but less standardized in American residential construction. When you see UK-specific advice, cross-reference it with ANSI/BHMA grades before purchasing. Your locksmith can tell you exactly which standards apply to a specific product and whether it suits your door type and local building code requirements in New Jersey.

The locksmith trade covers a wide range of specializations, and choosing the right type of professional matters for your project. A residential locksmith focuses on home entry systems — rekeying, deadbolt installation, mortise lock work, and lockout response. A commercial locksmith handles higher-volume applications like master key systems, access control panels, panic hardware, and high-security lock installations for businesses. Our team at Green Township Locksmith works across both residential and commercial locksmith services, which means we bring commercial-grade installation knowledge to residential projects — a meaningful difference when you are upgrading to a mortise lock or a Grade 1 high-security cylinder.

Our full service list covers everything a Green Township homeowner or business owner might need: residential lockout assistance, commercial lockout response, mortise lock installation and repair, deadbolt installation, door knob lock replacement, rekeying any lock brand including Schlage and Kwikset cylinders, master key system design, high-security lock upgrades, mailbox lock replacement, garage door lock service, sliding door lock installation, window lock installation, safe opening, safe combination changes, safe lock repair, car lockout service, auto key cutting, transponder key programming, key fob replacement, broken key extraction from any lock type, lock repair after a break-in attempt, door frame reinforcement assessment, padlock and hasp installation, cabinet lock installation, storage unit lock changes, and 24-hour emergency locksmith response throughout the Green Township area and surrounding Warren County communities. Whether the job is a quick rekey or a full mortise lock retrofit, we carry the tools and parts to handle it on-site in a single visit.

One of the most common questions we hear — right alongside 'how to pick a door knob lock when locked out' — is about pricing. We do not publish flat rates because several real factors shape what any locksmith job actually costs: the type and brand of lock or hardware involved, the time of day the call comes in, travel distance to your location, and the specific parts or cylinders needed to complete the work. An emergency locksmith call at 2 a.m. for a mortise lock on a steel door is a different scope than a daytime deadbolt installation on a standard wood door. What we can promise is that we confirm an exact price before any work begins — no surprise charges after the fact.

We also want to address some questions we see searched frequently by homeowners trying to budget for locksmith work: 'How much does an emergency locksmith cost,' 'How much does a local locksmith charge,' and 'Who is the cheapest locksmith' are all understandable things to wonder. Our honest answer is that the lowest-priced quote is not always the best outcome — a lock installed incorrectly or a door frame left weakened is a security liability, not a savings. We focus on doing the job right the first time, and we are transparent about what the work involves before we start. One question we occasionally get that falls outside our core service area: 'Is there a 24-hour locksmith in Richmond, VA?' — we are proudly rooted in Green Township, NJ and the surrounding Warren County region, and that local focus is what lets us respond quickly when you need us most. And yes, another common question — 'Can a locksmith reprogram my key fob?' — the answer is yes; our team handles transponder key and fob programming for a wide range of vehicle makes as part of our automotive locksmith services. Call (973) 457-4482 any time, day or night — we answer 24/7.

Start by identifying the door type and its current bore configuration. A standard cylindrical bore is 2-1/8 inches in diameter, which accepts most door knob with lock and deadbolt combinations sold at hardware stores. Measure your door thickness — most residential doors are 1-3/8 to 1-3/4 inches, and locks are spec'd to fit a specific range. If you are retrofitting an older Green Township home with original doors, those dimensions may not match modern off-the-shelf hardware, and a locksmith can mill or adapt the door as needed.

Next, look at your strike plate. The strike plate is the metal piece mortised into the door frame that receives the bolt. Most builder-grade strike plates are secured with 3/4-inch screws that barely reach the stud behind the frame — a strong kick can pull them out. Upgrading to a heavy-duty box strike plate secured with 3-inch screws that anchor into the structural stud is one of the single most effective security improvements you can make, and it costs very little. Finally, check the door frame and jamb for splits or gaps — a perfectly graded lock on a compromised frame offers little real protection. Our team assesses the full door system, not just the lock hardware, every time we do an installation.