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“ what grade is L series? ”

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Answer
What grade is the AL lock?
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.
What are ANSI BHMA hardware grades?
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...
What grade is our B600 series of deadbolts?
The B600, B700, and B800 are all grade 1 heavy duty commercial deadbolts.
What grade of stainless steel do we use in the levers on L9000 locks?
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.