1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your Defiant Single Cylinder Antique Brass Deadbolt. Designed for security and durability, this deadbolt offers robust protection for your home or property. Please read these instructions carefully before beginning installation or use to ensure proper function and safety.

Figure 1: The Defiant Single Cylinder Antique Brass Deadbolt assembly, showing the exterior cylinder, interior thumb turn, and the latch mechanism.
2. Safety Information
- Always wear appropriate safety gear, such as safety glasses, during installation.
- Ensure all components are present and undamaged before beginning installation.
- Do not force components during assembly; if parts do not fit, re-read the instructions.
- Keep small parts away from children to prevent choking hazards.
- If you are unsure about any step, consult a qualified locksmith or professional installer.
3. Package Contents
Verify that all the following components are included in your package:
- Exterior Cylinder Assembly (with keyway)
- Interior Thumb Turn Assembly
- Deadbolt Latch Mechanism (with adjustable backset)
- Strike Plate
- Mounting Screws
- Keys (typically 2)
4. Setup and Installation
Follow these steps for proper installation:
- Prepare the Door: Ensure your door has standard bore holes (typically 2-1/8 inch for the lock body and 1 inch for the latch).
- Install the Latch: Insert the deadbolt latch mechanism into the edge bore hole of the door. Ensure the latch bolt faces the door frame. Adjust the backset if necessary (2-3/8 inch or 2-3/4 inch) and secure with screws. The deadbolt features an all-metal Optimum latch with interchangeable faceplates for drive-in or traditional installations.
- Install Exterior Cylinder: Insert the exterior cylinder assembly into the larger bore hole from the outside of the door. Ensure the tailpiece aligns with the slot in the latch mechanism.
- Install Interior Thumb Turn: Place the interior thumb turn assembly onto the door, aligning its posts with the holes in the exterior assembly and the tailpiece.
- Secure the Assemblies: Fasten the interior and exterior assemblies together using the provided mounting screws. Tighten screws evenly to prevent binding.
- Install Strike Plate: On the door frame, align and install the strike plate where the deadbolt latch will extend. Secure with screws.
- Test Operation: With the door open, test the deadbolt using both the key from the outside and the thumb turn from the inside. Ensure the bolt extends and retracts smoothly without obstruction. Close the door and test again to ensure proper alignment with the strike plate.
5. Operation
To operate your Defiant Single Cylinder Antique Brass Deadbolt:
- To Lock from Exterior: Insert the key into the keyway and turn it clockwise until the deadbolt fully extends into the strike plate. Remove the key.
- To Unlock from Exterior: Insert the key into the keyway and turn it counter-clockwise until the deadbolt fully retracts. Remove the key.
- To Lock from Interior: Rotate the thumb turn clockwise until the deadbolt fully extends.
- To Unlock from Interior: Rotate the thumb turn counter-clockwise until the deadbolt fully retracts.
6. Maintenance
Proper maintenance ensures the longevity and smooth operation of your deadbolt:
- Cleaning: Wipe the exterior surfaces with a soft, damp cloth. Avoid abrasive cleaners or solvents, as they may damage the antique brass finish.
- Lubrication: For optimal performance, apply a small amount of graphite lubricant (powdered graphite) into the keyway annually. Do not use oil-based lubricants, as they can attract dirt and dust, leading to keyway blockage.
- Screw Tightness: Periodically check and tighten all mounting screws to ensure the deadbolt remains securely fastened to the door. Do not overtighten.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Key is difficult to turn or remove. | Lack of lubrication; debris in keyway; bent key. | Apply graphite lubricant to keyway; clean key; use original, undamaged key. |
| Deadbolt does not extend or retract fully. | Misalignment with strike plate; loose screws; internal mechanism issue. | Adjust strike plate position; tighten mounting screws; if issue persists, contact support. |
| Deadbolt feels loose on the door. | Loose mounting screws. | Tighten all mounting screws evenly. |
8. Specifications
- Brand: Defiant
- Model Number: DL81
- Lock Type: Key Lock
- Special Feature: Key Lock
- Material: Brass
- Style: Antique
- Color: Antique Brass
- Finish Type: Antique, Antique Brass
- Number of Pieces: 1
- Item Weight: 1.15 pounds
- Package Dimensions: 7.36 x 4.13 x 3.66 inches
- Manufacturer: Taiwan Fu Hsing Industrial Company
- UPC: 050134061576
9. Warranty and Support
The Defiant Single Cylinder Antique Brass Deadbolt comes with a Lifetime Guarantee, ensuring protection against drills, saws, picking, and prying. This warranty covers defects in material and workmanship under normal use.
For warranty claims, technical assistance, or further inquiries, please refer to the contact information provided on the product packaging or the official Defiant website. Please have your model number (DL81) and proof of purchase ready when contacting support.



