Under Lock & Key
 Call us: 864-517-6507
HomeResidentialCommercialAutomotiveTestimonialsTech Talk

Full Service Locksmith
Serving  The  Greater  
Greenville  &  Spartanburg  of South Carolina
Tech Talk

Pin and Tumbler Locks, how do they work ?

Rekeying a lock is the term used which refers to removing all the bottom pins from your existing door locks and replacing them with new pins and a new and different cut key. By having this done you have added security to your home because anyone who may have had a key to your home, that key will no longer work.

It is common to find pin and tumbler locks, in most homes today. They are composed of many different parts, a cylinder, chambers, springs, top and bottom pins, a clip and a tail piece. The bottom pins are those which follow the contour or cuts of the key being used. The top pins or driver pins apply downward pressure to the bottom pins via the springs. The cylinder has a series of chambers or holes that are properly measured in diameter and spacing. When the correct key is inserted into the cylinder and the top and bottom pins are aligned to what is known as the shear line the cylinder will turn and allow the latch to be retracted by the tailpiece which allows the door to be opened. A wrong key inserted into the cylinder will cause the pins to be misaligned and will prevent the cylinder from turning. 

Residential Keyed Entry Locks.
Three most common are handle set, knob or lever, and deadbolts.

Handle sets are used mostly on residential front doors and come in a variety of shapes, styles, and finishes. Some have just a thumb latch which allows the latch to be retracted by grabbing the handle and applying downward pressure with your thumb which retracts the latch. Others may have a lock mechanism built into the handle set.

Knob or Lever handle locks are locks used on most doors whether it is used on the front, side or back door. Lever handle locks can be a good choice for those who may find it difficult to grip a knob lock.

Single Cylinder Deadbolts can be added for additional security.  A single cylinder deadbolt requires a key from the outside and has a thumb-turn on the inside to lock and unlock the door. A double cylinder deadbolt requires a key on both sides of the lock to unlock and lock the  door.  You must always use Caution when choosing this type of  lock, because you must always have a key to unlock the door to exit the  room or house.

Interior Doors: Bedroom, Bathroom, Closet, Passage, Office, Storeroom.
Passage door knobs have no locking mechanism they are only used to enter a room and keep the door closed, via the  latch.

Privacy locks are similar to passage locks, however they use a push or turn button from inside of the room to lock the door. They usually come with a device that permits a person on the outside to open the door if needed. These types of  locks are used on bathrooms and bedrooms, where privacy is need.

Entry, Classroom, or Storeroom locks my be a good choice for a home office door. This gives you the opportunity to lock and unlock the door using a key.