Kwikset 660SQT-15S.DS Square Single Cylinder Deadbolt with SmartKey Satin Nickel

Part Nr: 660SQT-514S.DS



Single Cylinder


Adjustable 2-3/8 or 2-3/4 Inches




2-1/8 Inches



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Product Summary

The largest-selling deadbolt in America, the 660 SQT series deadbolt provides tough, effective protection at an affordable price.

Single Cylinder Deadbolt for 2-1/8” Bore Hole. Kwikset is America’s #1 selling lock. This Kwikset 660 SQT single cylinder deadbolt is intended for doors with a 2-1/8”" bore hole. This Kwikset deadbolt features a 1” bolt and meets ANSI Grade 3 requirements. Please call (866) 259-8901 if you have any question or would prefer to order by phone. We are here to help!


  • Features adjustable latch & deadbolt to fit all standard door preparations
  • ANSI/BHMA Grade 3 Security
  • Add to a keyed knob or lever for additional security
  • Lifetime mechanical and finish warranty
  • Featuring SmartKey® Re-key Technology. The lock you can re-key yourself in seconds


  • Door Prep: Cross Bore 2-1/8", Edge Bore 1"
  • Backset: Adjustable to 2-3/8" or 2-3/4"
  • Door Thickness: 1-3/8" - 1-3/4" (Kit Available for 2-1/4" Thick)

Product Identifiers


Technical Documents

Instructional Videos

How to Re-Key a SmartKey Security Lock
How to Re-Key a SmartKey Security Lock

Questions & Answers (1)

Question: How do I find the key code for my existing locks? I am trying to key this one the same as the others. DC

Asked by David Campbell on June 17, 2021

Answer: David, On the original keys there should be five digits stamped on the key head. That is the key code. If you do not have the originals you would need to take your key to a locksmith and they would be able to tell you the key code after putting it into a key code reader.

Answer provided by Michael on June 17, 2021

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Kwikset 660 SQT SMT Square Single Cylinder Deadbolt with SmartKey
Kwikset 660 SQT SMT Square Single Cylinder Deadbolt with SmartKey
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