difference between 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 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.
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.