Sash locks are ideal for
use with external as well as internal doors. They provide extra security
to external doors with its unique deadlock feature. They usually have a
simple latch reversible mechanism and are provided with a flat striking
plate. Sash locks are designed in such a way that they complement the
existing door furniture.
Sash locks are easy to install and come with 2 keys, fixings and
fitting instructions. In some cases the sash locks should be augmented
by mortise rack bolts from the top and bottom of the door into the wood
and operated internally. There can also be surface-mounted locking bolts
for top and bottom. Door sash locks should always be fitted at 90º
to the grain of the wood, thereby minimizing the chances of the wood
splitting when subjected to pressure.
Materials used in Sash Locks
Sash locks are cast of metals like:

Sash
Door Lock are available in various finishes to prevent them from
corrosion and also to enhance their look. Polished brass, satin chrome
edge finish and antique finishes are very popular among sash locks.
3-lever option is the most commonly used variety of sash lock. The
3-lever sash lock come with a flat striking plate and provide additional
security to the internal doors. They have a spring strength adjustment
and a simple latch reversible mechanism.
One of the striking feature of sash locks is that they are available in
more than a thousand different key options making it extremely difficult
to duplicate them. This unique feature of sash lock makes them the first
preference of customers when security of the home is concerned.