How does this deadbolt differ from from the 665?
This is the Smart Key version which allows you to re-key the lock yourself! Just insert the original key along with the included Smart Key tool and then insert your new key.

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From Kwikset's Security series this double cylinder deadbolt, locking and unlocking from a key on both sides, would make any door more secure. Now Featuring the SmartKey Cylinder so you can re-key your locks without needing a locksmith.
This product is listed under the following manufacturer number(s):
*Denotes a finish or option that has been discontinued
This is the Smart Key version which allows you to re-key the lock yourself! Just insert the original key along with the included Smart Key tool and then insert your new key.
Yes, this can be left in the unlocked position. You will need to use the key on both sides to lock and unlock the dead bolt.
The Kwikset 665-S will need to be taken to a locksmith to reset the pins unfortunately.
The Kwikset 665-S can be keyed alike to non-smart key cylinders.
Yes, all can be keyed the same.
| ADA | Yes |
|---|---|
| ANSI Certification | A156.2 |
| BHMA Certification | Grade 3 |
| Backset | 2-3/4", 2-3/8", Adjustable 2-3/8" or 2-3/4" |
| Cross Bore | 2-1/8" |
| Cylinder | SmartKey 5 Pin |
| Door Thickness | 1-1/2", 1-3/4", 1-3/8", 1-5/8" |
| Function | Double Cylinder |
| Handing | Left, Reversible, Right |
| Height | 2.5 |
| Latch Faceplate | Drive-In, Round Corner, Square Corner |
| MasterFinish | Brass Tones, Bronze Tones, Chromes, Nickel Tones |
| Product Class | Residential |
| Projection | 1.125 |
| Width | 2.5 |
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