It's quite useful to have two locks in the door separating the house/apartment from the surrounding world but use just one of them. Locks happen to break, although that's quite rare. If one of the locks starts malfunctioning you can just stop using it and use the other one until you fix the first one.
A deadbolt lock will secure your door from would-be thieves. Every exterior door should have at least two locks to deter them.
Double lock means that all opening handles are released mechanically when locking from the outside, which makes it impossible to open the doors from the inside.
Security. Having a dead bolt that has a one inch throw (the part of the lock that engages into the jamb of the door when locking) is generally recommend for exterior doors of homes for security purposes. Basically a dead bolt provides much better security than just a regular latch on a door.
Exterior doors.
To be truly secure, any exterior door needs a dead bolt. You have a choice of separates—a deadbolt and a lockset mounted separately—or a handle set that incorporates both features.
While the single-cylinder deadbolt only features a locking mechanism requiring a key on one side, the double-cylinder deadbolt has it on both. This means that a key will be required to turn the lock both on the inside of the door and the outside.
Double-cylinder locksets are keyed on both sides; they function with a key from both the exterior and the interior of the door. This means that a home or business owner would need to use a key to engage or retract the lock bolt even from the inside.
A double cylinder door knob is a door knob that is keyed on both sides of the door, or in a place where the door that needs the option of locking on either side of the door.
In the U.S., there is no single comprehensive law against dual-cylinder deadbolts. Individual cities and states have local property and fire codes that may prohibit the use of dual-cylinder deadbolts. The code may prohibit the use of dual-cylinder deadbolts in some buildings and allow them in others.
Generally speaking, deadbolts are sturdy locks that can withstand kick in and other forced entry attempts. However, a door with a deadbolt can still be kicked down if the door itself is not solid. So, to protect your door against kick in, you want to make sure both the lock and door are of high-quality grade.
The major benefit of double cylinder deadbolts is that they are designed to offer high security level. This makes doors that have them more difficult for intruders to pick or unlock. Double cylinder deadbolts are the safest choice for homeowners.
Deadbolts come in two versions. Double Cylinder Deadbolts have a keyed cylinder on both sides. This is a good option for doors with glass or windows since an intruder can't break into the door even if the glass/window is broken.
First, let's define a double-keyed deadbolt. It's a deadbolt that locks from the inside and the outside with a key. This means if the door is locked, there's no getting in or out without a key.
Half dummy door knobs are non-locking door knobs that don't have to be rotated or turned when opening or closing a door. Instead, you simply pull on the door to open it. Half dummy door knobs are mainly used on double doors that close side-by-side, such as on cabinet and wardrobe doors.
By definition, privacy locks are locksets that can be locked by a button or a turn piece on the inside with no key function. There are 3 types of privacy locks: turn button, privacy pushpin/button lock, and privacy bolt with a lever or knob.
In lock: Development of modern types. … in England, patented a double-acting tumbler lock. A tumbler is a lever, or pawl, that falls into a slot in the bolt and prevents it being moved until it is raised by the key to exactly the right height out of the slot; the key then slides the bolt.
Simply install the cups of the passage lock on one door and a privacy lock on the other. Mount the strike for the privacy on the edge of the passage door, and you're done! The latch from the privacy will hold the two doors together when the lock is engaged.
Deadbolt door locks are the most secure type of key lock and are usually used on a home's exterior door. Available in single- and double-cylinder styles, deadbolts are rated according to their strength from Grade 1 to Grade 3. A Grade 1 is the highest grade and provides the most security.
Single cylinder locks are usually less costly to purchase and install than double cylinders. They are also more convenient, since there's no need for a key to operate the lock from the inside. A simple thumb turn locks and unlocks the door.
Also in the non-forced entry category, there is no doubt Schlage is better. With a better, more precise manufacturing process and 2 additional security pins than the Kwikset deadbolt, Schlage locks are significantly harder to pick, bump or compromise in non-destructive ways.
Having a single sturdy lock on your door is perfect. However, two locks could add extra protection to your door/home or place of business. So one or two sturdy locks are okay for a front door lock.
The best way to reinforce your frame is by adding a layer of steel to prevent them from splitting. This makes your door kick proof. Installation entails placing high-gauge steel over the door jamb and securing it with long screws. The screws should penetrate through to the wall studs on all sides of the doorway.