Discontinued and limited to existing inventory - Replace with 40521 or 40522

2 Inch Backset Double Cylinder Dead bolt.
Key on Both Sides
This Atrium style Door Dead Bolt is a replacement for Amerock and National Dead bolts with 2 Inch Back Set.
Has Double Cylinders and is keyed on both sides.
The Dead Bolt projects 1 inch outside and 1 inch inside.

Available in Polished Brass

Related 2" Backset Deadbolts:
40502 - Single Cylinder Deadbolt
40521 - Single Cylinder, Heavy Duty Deadbolt
40522 - Double Cylinder, Heavy Duty Deadbolt

Articles:
How to Install Deadbolt for Doors with 2 in Backset (Atrium, Morgan, etc) 

NOTE: Because there are safety concerns of exiting a house fast in case of Fire, Earthquake, etc. and needing a key to unlock the door from inside some cities and counties do not allow double cylinder deadbolts.
Check with your community services for your application.

 
Installing a Double Cylinder Deadbolt with a Two-Inch Backset (for Atrium Doors, Morgan Doors, etc)