Lock and Cylinder Changes at Bolt Locksmith (Up to 50% Off). Two Options Available.
May be repurchased every 120 days. Valid only within 20 miles of zip code 11224. Appointment required. Limit 1 per person, may buy 1 additional as gift. Valid only for option purchased. Offer does not include opening the door to which keys have been lost * Requires making an appointment during regular business hours, otherwise there is an addition service fee.
Professional locksmith offers a variety of services including lock changes, cylinder inspections of all doors as well as key duplicates
Choice of:
- Lock Change with Mul-T-Lock Cylinder Inspection of All Doors in the Household
- Mul-T-Lock Cylinder Change with Two Additional Key Duplicates
Pin-and-Tumbler Locks: Lining Up for Entry
The seemingly random ridges on your keys are actually a code that tells a lock how to open. Read on to learn more about how a common type of lock lets you in—and keeps burglars out.
Since its invention in the 19th century, the average pin-and-tumbler door lock has remained remarkably trustworthy: put the right key in and the lock grants you entry. Put the wrong key in and no dice—like clockwork, every time. The lock works through a feat of simple mechanical engineering. Inside the lock is a cylinder that rotates to move the deadbolt in and out. The purpose of a lock is to keep that cylinder from turning when it isn’t supposed to—an obstacle it achieves via five or six spring-loaded pins that block the cylinder’s rotation. At rest, with no key in the lock, the pins cascade into the keyhole at varying lengths. The length of these pins correspond precisely to a key’s serrated ridges, which, when inserted into the keyhole, align the pins so that they form a single, seamless gap known as the shear line. Only then will the cylinder be able to rotate and disengage the lock. With the wrong key, the pin heights won’t align correctly, preventing the cylinder from turning and keeping intruders from watching your parents’ cable while they’re out of town.
Of course, the pin-and-tumbler mechanism is just one of many varieties of locks, and in fact its design wasn’t even particularly groundbreaking. The inventor, Linus Yale, drew inspiration from a large wooden version used in ancient Egypt some 4,000 years prior.
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