Kwikset 663 Unkeyed One-Sided Deadbolt
- No exterior key: locks only from inside
- Doors 1-3/8 to 1-3/4 inch thick
- Adjustable backset, 2-3/8 to 2-3/4 inch
- Grade 3 BHMA security, durability and finish
- Lifetime mechanical and finish warranty
- Screwdriver install, hardware included
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A one-sided deadbolt that adds a locked-from-inside bolt to an entry door with only a screwdriver. It has no key cylinder, so it cannot be opened from outside.
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ASIN: B0087YZF24Model: 663Category: Deadbolts
Overview
Homeowners who want an extra bolt that only works from inside get a single-sided deadbolt with a round satin nickel thumb turn. It fits standard doors, the latch adjusts with a twist, and every screw and plate you need comes in the box.
Extra security without another key to carry is the reason to buy it, since nobody outside can attack a cylinder that does not exist. It pairs with an existing keyed lock. The product description contradicts the bullets about a key outside, so confirm the unkeyed version is what you are getting.
Who it's for
Front, side or garage entry doors that people leave by another route suit it, along with rooms that need a privacy bolt. A sole exterior entry needs a keyed deadbolt so you can lock it on the way out.
Pros and cons
- No outside cylinder to attack
- Adjustable latch backset
- Fits standard door thicknesses
- Microban treated hardware
- Cannot be locked from outside
- Grade 3 is the entry BHMA level
- Description conflicts with unkeyed bullets
Performance notes
Security depends on the strike and its screws reaching into the frame, so screw length and door jamb condition matter as much as the bolt. The adjustable latch sets backset with a twist. With no outside cylinder, picking and bumping are not possible.
Specifications
| Brand | Kwikset |
|---|---|
| Model | 663 |
| Dimensions & fit | |
| Item dimensions | 7.25 x 3.5 x 1.75 inches |
| Construction & materials | |
| Finish Types | Satin Nickel |
| Compatibility & installation | |
| Handle Compatibility | Doors 1-3/8 to 1-3/4 inch thick |
| Included components | |
| Included Components | Interior turn piece, adjustable latch, screws, strike plate, adapter, installation hardware, install guide |
| Warranty & support | |
| Manufacturer Warranty Description | Lifetime mechanical and finish warranty |
| Other details | |
| Lock Type | Unkeyed deadbolt, interior thumb turn only |
| Shape | Round |
| Backset | Adjustable 2-3/8 to 2-3/4 inch |
| Additional Features | Microban treated |
| Certified Security & Outdoor Durability | Grade 3 BHMA security, durability and finish |
Frequently asked questions
What tools do I need to install the Kwikset 663 deadbolt?
Just a screwdriver. All installation hardware and directions are included.
Can the Kwikset 663 be locked from outside?
No. The unkeyed version locks and unlocks only from the interior using the thumb turn.
What door thickness fits the Kwikset 663?
Standard doors 1-3/8 to 1-3/4 inch thick, with a backset adjustable from 2-3/8 to 2-3/4 inch.
What security grade is the Kwikset 663?
Grade 3 BHMA certified for security, durability and finish.