Kwikset 663 SQT Square One-Sided Bolt

Part Nr: 663SQT-26D



One Sided










Square Corner


1-3/8 to 1-3/4 Inches


1-5/8 Inches

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Product Summary

Thumb Turn One-Sided Bolt



  • 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


  • Door Prep: Cross Bore 1-5/8",
  • Backset: 2-3/8" or 2-3/4"
  • Door Thickness: 1-3/8" - 1-3/4"

Product Identifiers


Questions & Answers (2)

Question: Can you clarify the lock type? Is it like a regular deadbolt?

Asked by Roland Valle on September 24, 2020

Answer: Roland, One Sided: A one sided deadbolt locks a door from the inside. These are commonly used on patio doors.

Answer provided by Michael on September 25, 2020

Question: I like this deadbolt, except my bore hole is 2 1/8". What deadbolt has this same appearance with a bigger bore hole size?

Asked by Kent Bos on August 2, 2020

Answer: Kent, 258 SQT SMT

Answer provided by Michael on August 3, 2020

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Kwikset 663 SQT Square One-Sided Bolt
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