A mortise door lock is a lock that is inserted into a door's hole or pocket.This kind of lock is more prevalent in the UK market and can be found with various price tags.
Door lock types
Since Chubb has emerged as the market leader for this particular style of lock over the past several decades, a mortice lock is sometimes referred to as a "Chubb" type lock by individuals in the UK. Mortice locks come in two different types—deadlocks and sash locks, which are often used on rear doors and contain a handle and latch mechanism. Mortice Lever Locks Mortice cylinder locks Mortice Lever Locks The majority of lever mortice locks operate quite similarly, making them the most popular form of mortice lock installed in household buildings in the UK. When a key is twisted to turn the lock, levers are raised to the proper height, allowing the bolt to be locked and unlocked. Refer to the diagram. Depending on the use and thickness of the doors, lever mortice locks may have a varying number of levers; in general, the thicker the lock is, the more levers are stacked in the lock case. There is less chance that one key will open more than one lock since there are more levers, which implies more key variations. Additionally, a lock with five levers is more secure than one with, say, two levers. The most typical types of lever locks are: 2 lever mortice locks - This kind of lock has two levers and is thin enough to be used in interior doors that are less than 45 mm thick and need a modest degree of security. Not advised for exterior doors' security. a three-lever mortise lock is more extensively used, has more manufacturers to pick from, and is more secure than a two-lever mortise lock. Also appropriate for interior doors with a thickness under 45 mm. Not advised for exterior doors' security. 5 lever mortice locks may be used on thinner interior and exterior doors when a medium degree of security is required. Lock cases range in size. The majority of locks have a box strike. British Standard (BS 3621) five-lever mortice locks lock has all the same characteristics as a five-lever lock, plus anti-drill plates on each side of the lock case and a bigger, stronger deadbolt. Recommended for exterior doors that demand a high degree of security and compatible inside doors that are at least 45mm thick. Box strike is included by default. Checking for the British Standard kite mark is an excellent method to determine if you presently have a British Standard lock installed since most insurance agencies in the UK now require that all final exit doors be furnished with at least one BS3621 lock. which will be imprinted on the lock's faceplate at the door's edge. 
Door lock parts
These locks vary from lever locks in that a cylinder, rather than a key, is used to throw the bolt. They are more often seen in business buildings, but since they give greater freedom with master suites and limited keys, more individuals are now having them installed in their houses. A euro profile cylinder or an oval profile cylinder, which may be key operated from both sides of the door or from one side of the door and locked and opened with a thumb turn from the other, is often installed in cylinder mortice locks. Compared to cylindrical locks, they provide a greater selection of trim patterns, rose, and escutcheon types. They are available in a selection of finishes and door thicknesses. The backset cannot be adjusted. Mortise locks may also be purchased with occupancy indicators, ornate roses and escutcheons, thumb turns, and detention-grade vandal-resistant features made of stainless steel. A lock chassis with an integrated latch bolt, operable trim, and roses plates behind the trim make up a mortise lock. A mortise cylinder is prepared into the door face for keyed functions. For conventional cylinders, all that must be done to extract the cylinder for rekeying is to remove the locked front. For the whole lock body, mortise locks need a mortise (or "pocket") at the edge of the door. Furthermore, holes for trim and cylinders must be drilled on the door's face. Different lock functions may call for various holes in the door's face. Locks could be difficult to replace out since face preps and latch bolt placements vary amongst lock manufacturers. 
Door locks and handles
They are simple to install, however setting up the lock feature or changing the handling could need a few more steps. Internal or external, new or retrofit construction may all benefit from the usage of mortise locks. Grade 1 mortise locks are the most common. Mortise locks outlast cylindrical locks because of the nature of their design. Deadbolts built into certain devices provide an added layer of protection. Because the latch bolt and deadbolt may be simultaneously retracted while leaving, integrated deadbolts are code compliant. Since there is no need for two distinct boreholes, using locks with integrated deadbolts may also increase the strength and integrity of the door. Mortise locks are a wonderful choice for commercial-grade doors and may withstand years of usage, particularly when a higher degree of security is required. The extensive range of functions and the more secure latch bolt of a mortise lock make them superior to a cylindrical, or bored, lock. The latch bolt on a cylindrical lock was not produced strong enough to be regarded as Grade 1 quality until the last 30 to 40 years. In Grade 1, a mortise bolt has always been accessible. Mortise locks may also have an integrated deadbolt for further security and privacy. Because of the way a mortise lock is constructed, a broader range of lever and trim types may be produced, allowing you to get or complement almost any aesthetic scheme. The expense of a mortise lock has always been its main drawback. The cylindrical lock is preferred by those who are exceedingly frugal or who don't mind having door hardware with a functional appearance. 