Security door locks are a vital element of home security. Choosing the right lock can be confusing particularly if you don’t understand the jargon. In this article, we explain the different types of locks and also what lock quality is.
Different Types Of Locks
Frank Security Locks in Cambridge, MA has the most extensive variety of Security door locks. But before being able to identify different types of locks, it is important to understand the basic parts of a lock. The cylinder of a lock refers to the place where the key goes in. If you insert the wrong key in a cylinder and the pins inside the cylinder do not unlock the lock.
- Single cylinder
- Double cylinder
- Doorknob lock
- Lever handle lock
Each one of these locks is used for a different purpose.
Single Cylinder Lock
A single-cylinder lock opens with a key from the outside. On the inside, there is a turning thumb-knob. The reason why this is called a single-cylinder lock is that there is only a keyhole on the outside of the lock. This is not one of the most secure security door locks because intruders can reach in somehow and turn the thumb-knob to open the door.
Double Cylinder Lock
Double-cylinder locks are security door locks similar to the single-cylinder lock with one key difference. Instead of the thumb-knob on the inside, the same key is used to unlock the lock from the inside. These are some of the most effective security door locks on glass doors and windows. This is because the intruder must have a key or needs to break the glass to get inside. The glass can be armed with an alarm.
A doorknob lock is one of the most common locks on doors inside a home. A doorknob lock features a doorknob on both sides of the door. These are not very secure as far as security door locks are considered. This is the reason why you will most often see them on bathroom doors. Eventually, everyone needs to be able to open that door from the outside.
Lever Handle Lock
A lever handle lock has a handle which will open the door. These security door locks can easily be opened with one hand if you are carrying groceries in the other hand. A lever handle lock has a keyhole on both sides. Lever handle locks are often the target of torque attacks. A torque attack is when excessive pressure is applied to the handle to force the lock open. Some lever handle locks also have a clutch installed. This means that instead of applying pressure to the lock the handle will simply turn.
Deadbolts come in three principal variations. The first is the single cylinder deadbolt which has a keyhole on the outside and a thumb turn on the inside. The second is a double cylinder deadbolt. The double cylinder deadbolt has a key cylinder on both sides and will not open unless you have the key. These security door locks can have serious implications in the event of an emergency. The third is called the lockable thumb turn. It has a thumb turn on the inside with a key. The key can be used to lock the thumb turn in either position. Deadbolts are the most secure security door locks.
Making The Grade | Understanding Lock Quality
When you buy high-security door locks from Frank Security Locks in Cambridge, MA you will see a rating on every lock. The American National Standards Institute grading system for locks was developed in conjunction with the Builders Hardware Manufacturers Association (BHMA). National hardware manufacturers need to comply with and maintain certain standards to achieve these grades.
These are the best industry-standard locks. Grade 1 locks are manufactured to withstand one million open and close cycles. A grade 1 lock can withstand 10 blows with a 75 ft-lbf (foot per pound-force). These locks are used if security is of prime importance.
These locks are good locks which are not the best. Grade 2 locks are manufactured to withstand 800,000 open and close cycles. A grade 2 lock can withstand 5 blows with a 75 ft-lbf (foot per pound-force). These locks are often used on the front door of houses and for commercial purposes.
This is the lowest standard of locks. Grade 3 locks are manufactured to withstand 800,000 open and close cycles. A grade 3 lock can only bear 2 blows with a 75 ft-lbf(foot per pound-force) before it gives. These locks are the locks that are usually used inside homes and living spaces.
At Frank Security Locks in Cambridge, MA we have locks from all different types of makers and grades. High quality security door locks come with instructions as well, if you are planning to install the locks by yourself.