This article will explain what Lockset Grading and Functions are and why this should be important to you.
To start with who sets the Grades? The answer; in the Unites States the grading systems for locksets was developed by the Builder’s Hardware Manufacturers Association (BHMA) in conjunction with the American National Standards Institute (ANSI). This is why you will see ANSI/BHMA written when grading, finishes, functions, etc. are talked about.
So what is Grading? Grading comes in three steps from Grade 1 (the highest) to Grade 3. With performance doubling as you from Grade 3 to Grade 2 and from Grade 2 to Grade 1.
Grade 1: Used in Commercial and Industrial Applications, such as schools, offices, shopping centers. Tested to withstand at least 1 million opening and closing cycles. Latches on door locks to extend 3/4″ from the door, and the deadbolt to project at least 1″ from the door. Can withstand at least 10- 75 ft. lbs. strikes to the knob or lever. Sounds confusing check your front door…it’s make sense.
Grade 2: Used for heavy residential and light commercial such as interior office doors, closet doors, etc. Tested to withstand 800,000 opening and closing cycles. Latches on door locks to extend 1/2″ from the door and the deadbolt to extend 5/8″ from the door. Can withstand at least 5- 75 ft. lbs. strikes to the knob or lever.
Grade 3: Used primarily for residential applications. Tested to withstand 800,000 opening and closing cycles. Latches on door locks to extend 1/2″ from the door and the deadbolt to extend 5/8″ from the door. Can withstand at least 2- 75 ft. lbs. strikes to the knob or lever.
What are Lock-Set Functions? This is the ANSI/BHMA standard that defines what the Lockset is used for. I will explain the most popular.
Entry Lock: Outside knob/lever can be locked by push or turn button inside. Key outside or push button inside releases push or turn button unlocking outside knob/lever, except when push or turn button has been rotated to keep outside knob/lever locked. Inside push or turn button must be manually operated to unlock outside knob/lever. Inside knob/lever always operated outside latchbolt.
Privacy Lock (Bedroom, Bathroom,Office) Latchbolt operated by knob/lever from either side. Outside knob/lever is locked by push button and unlocked by emergency release outside, operating inside knob/lever or closing door.
Passage (Closet) Latchbolt operated by knob/lever from either side at all times. Non locking function.
Storeroom: The latch can be opened by using a key from outside or using the knob/lever from the inside. A key is required to open the lock from the outside.
There are additional functions, however these are the most common. ANSI/BHMA also provide standards for locks finishes, but that is a subject for another article.
Locking Systems International can provide Locksets and Deadbolts in ALL grades and functions for information go to our WEB SITE or call 800.657.LOCK (5625).