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First Watch Security 1120 Single Cylinder Interlocking Deadbolt

First Watch Security 1120 Single Cylinder Interlocking Deadbolt

First Watch Security 1120 Single Cylinder Interlocking Deadbolt


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Product Description

Available while supplies last.
This Single Cylinder Interlocking Deadbolt from First Watch Security is offered in a polished brass finish. Part of the Replacement Knobs & Roses collection.
Single Cylinder Interlocking Deadbolt, Brass Tone
  • 5-pin tumbler with hardened steel pins
  • Single cylinder locking unit and strike
  • Locks door to jamb to prevent forced entry
  • Requires a 1-1/4" hole
  • Includes tamper-resistant shutter guard
Finish:Polished Brass
helpBoxDeadbolt Type
Choose between either a Double Cylinder, a Single Cylinder or an electronic deadbolt. A Double Cylinder is keyed on both the inside and outside, while a Single Cylinder is keyed on the outside but a thumb turn on the inside.

Deadbolt Type:Single Cylinder
helpBoxDoor Thickness
Knowing the thickness of the door is crucial when installing door hardware.

Door Thickness:1 1/4-in to 2-in

Dimensions & Weights 

Width:2.85 inches
Projection:1¾ inches
Length:4½ inches
Height:2.85 inches
Depth:1.79 inches


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First Watch Security 1120 Single Cylinder Interlocking Deadbolt
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Average Customer Review
2.5 out of 5
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Interlocking deadbolt
By from Portland, ME on Jan 12, 2015
Avid Do-It-Yourselfer
Had hoped it would be a drop-in replacement of existing lookalike deadbolt that had internal broken part. Deadbolt part matched screw holes and key tang from outside key (so I didn't have to replace original key) but the moving deadbolt pins were just enough different that they wouldn't mate with old fixed strike portion on the door frame. Replaced strike and luckily the screw patterns matched (although 2 fewer screw holes where they shortened up an edge to save money) but again was just enough off that the pins wouldn't engage. With a lot of fiddiling and shimming and some filing of the strike holes to help guide the entering pins I got it to work. Also did find that the internal mechanism must be pretty crude and rough since it tended to bind up requiring rocking the knob back and forth to get it to actuate.

The price was right but certainly not a sterling example of US manufacturing prowess from Granville Michigan from whence it came!
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Cylinder Lock
By from Denton, TX on Aug 10, 2014
Casual Do-It-Yourselfer
Product works fine. It's useful if you have a French door or other type that will no longer lock.
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Poor Design, Poor Choice
By from on Feb 08, 2011
Front key plate on outside of door is made from paper thin metal. I accidentally punctured it merely HAND TURNING the screws from the other side of the door, and I didn''t even get the plate snug to the door frame, which is a standard size and guaranteed to fit. Hardly a security feature. Someone could just pop it in w/ a screwdriver or quickly drill it out. Lowe''s does not have a very good selection of single cylinder dead bolts. Buy this product if you want a paper weight.
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Additional Details

Mfr Part #:
UPC #:
Group #: 806082
Category: Deadbolts - 718
Style: - 0
Sales Rank: 2

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