What are lock grades ?

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The AL lock is a Grade 2 lock ANSI/BHMA Certified A156.2-2003, Series 4000, Grade 2, UL Listed for 3-hour fire door.
The B250 is Grade 2 but has no UL listing due to the holdback rose.
The B500 deadbolts meet the following certification: ANSI A156.5, 2001, Grade 2. Available UL Listed for 3-hour fire door.
Schlage offers 629 and 630 stainless finishes on levers for the L-Series only.  These levers are made of 303 or 304 grade stainless steel.
The American National Standards Institute (ANSI) and Builders Hardware Manufacturers Association (BHMA) have developed durability, strength and performance standards for every type of door hardware...
The B600, B700, and B800 are all grade 1 heavy duty commercial deadbolts.
Grade 1 locks are tested and certified to be in compliance with the following ANSI/BHMA Standards: Cylindrical, Bored and Preassembled Locks & Latches 800,000 Certified Cycles ANSI/...
Grade 2 locks are tested and certified to be in compliance with the following ANSI/BHMA Standards: Cylindrical, Bored and Preassembled Locks & Latches 400,000 Certified Cycles ANSI...