Busse's Lock Service, LLC: 
                        2003 Wake Forest Rd, Raleigh, NC 27608

Glossary

Function

This refers to the specific features available in different door locks. A passage lockset is one with free access in both directions (non-locking). A privacy lock is commonly found on bathrooms, bedrooms and dressing rooms. An entry lockset is the familiar type with a button on the inside and a keyhole on the outside. Storeroom locks are always free from the inside, but are always locked from the outside. (Building codes typically specify storeroom locks on rooms used to store toxic chemicals.) There are dozens of varieties that professional locksmiths can recommend and supply. Whatever your security needs, there is probably a lock function designed to address it!

Grade (1, 2, 3)

This is a durability and security rating that is issued by ANSI. Specific security features and the durability of the product (the expected number of “cycles” or operations the product endures before wearing out) determine its grade. Grade 1 locks are very heavy-duty and are the only ones suitable for high-traffic public areas. Think of Grade 1 locks as “industrial strength.” Grade 2 locks are “commercial strength.” They are suitable for areas with moderate traffic, such as the employee-only areas of an office. Grade 3 locks are suitable only for residential applications. They will only last in a low-traffic area where people are not likely to abuse the product or treat it roughly. Professional locksmiths can be sure that you get the correct grade of hardware for your particular application. Higher grade locks cost more, of course, but no professional locksmith (nor any hardware manufacturer) will warranty a lock installed in an inappropriate setting.

High-security

This term typically refers to any lock that uses patented or unconventional design features to thwart the most common types of attacks on locks--picking and drilling. There are high-security cabinet locks, door locks, and padlocks. Even some cars are equipped with special high-security lock systems which are especially resistant to vandalism and conventional means of fitting a key. Some, but not all high-security locks also come with restricted keys. Professional locksmiths are the best source for high-security locking devices.

Impression

This refers to a method of fitting a key without disassembling it. It involves repeatedly inserting a key blank into the lock and gradually filing the key to fit. This is not a do-it-yourself project! Locksmiths spend years cultivating a knack for impressioning locks. Some locks are not suitable for this procedure no matter what the skill level of the locksmith.

Interchangeable Core

This term refers to locks that are designed to facilitate frequent rekeying without disassembling the lock. A special key called a control key is used to remove and replace the cylinder or core. Common uses for this type of lock are college campuses and retail stores where frequent rekeying is necessary.