Buying a new deadbolt?
Here's the specifications you should look for:
 Bolt should be 1" thick with a 1 ½" throw (bolt extended).
Bolt should be constructed to include a hardened steel core.
When installed, bolt should lock into place when extended. You should not be able to push the bolt back by hand.
Lock cylinder should be constructed of 100% brass (some manufacturers use a combination of brass and plastic).
Screws that anchor rear thumb-turn plate to front lockset should be heavy-duty at least ¼" or larger in diamater.
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Deadbolt face should be 2 pieces (outer slip ring with separate lock face - manufacturers may join both pieces together).
Outer slip ring should be free moving when NOT installed.
Outer slip ring should contain a tempered or hardened interior ring. (it shouldn't be hollow)
Deadbolt should be of a 6 or 7 pin construction. (Available ONLY through locksmiths)
Deadbolt should contain pick-proof pins. (Available ONLY through locksmiths)
When mounted to the door surface, the deadbolt face should be able to sit flush to the door to help defeat crowbar attacks.
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