1. Product Overview
This manual provides instructions for the KOTARBAU Metal Door Knob, Model 5907465908344. This rotatable ball knob is designed for various door types, offering a secure and functional solution for opening and closing doors. It features a durable powder-coated finish for enhanced longevity and rust resistance.

Figure 1: KOTARBAU Black Metal Door Knob and included screws.
2. Package Contents
- 1 x KOTARBAU Metal Door Knob (Black, Powder Coated)
- Mounting Screws
- Rosette (integrated or separate, depending on design)

Figure 2: Components of the KOTARBAU Door Knob set.
3. Specifications
| Model Number | 5907465908344 |
| Brand | KOTARBAU |
| Material | Metal |
| Colour | Black |
| Exterior Finish | Powder-coated |
| Handle Type | Knob (Rotatable Ball Knob) |
| Knob Diameter | 55 mm |
| Item Weight | 107 Grams |
| Special Features | Rust-resistant (Rostfrei) |
| Specific Uses | Commercial and personal use |

Figure 3: Technical dimensions of the KOTARBAU Door Knob.
4. Setup and Installation
The KOTARBAU Door Knob is designed for quick and straightforward installation on most apartment and house door types. No specialized tools or extensive prior knowledge are required.
Required Tools (Not Included):
- Screwdriver (appropriate for the provided screws)
- Measuring tape (optional, for precise placement)
- Drill (if creating new holes for a fresh installation)
Installation Steps:
- Prepare the Door: If replacing an existing knob, remove the old hardware. For new installations, ensure the door is properly prepared with the necessary boreholes for the knob and spindle mechanism. Refer to the dimensional drawing (Figure 3) for hole spacing if needed.
- Assemble the Knob: The door knob typically consists of two halves that connect through the door. Insert the spindle (if separate) through the door's latch mechanism.
- Position the Rosettes: Place the rosettes (base plates) on both sides of the door, aligning them with the spindle and screw holes.
- Attach the Knobs: Secure the knob halves to the spindle and rosettes.
- Secure with Screws: Use the provided mounting screws to firmly attach the door knob assembly to the door. Ensure the screws are tightened securely but do not overtighten to avoid damaging the door or hardware.

Figure 4: Example of mounting screws provided with the door knob.
5. Operating Instructions
The KOTARBAU Door Knob is designed for simple and reliable operation.
- To open a door, grasp the ball knob and rotate it in either direction (clockwise or counter-clockwise) to retract the latch mechanism.
- Push or pull the door open.
- To close the door, simply push it shut. The latch will automatically engage with the strike plate, securing the door.
The smooth rotation ensures convenient and safe access.
6. Maintenance
The KOTARBAU Door Knob is constructed from robust metal with a powder-coated finish, making it rust-resistant and durable. Minimal maintenance is required to keep it in optimal condition.
- Cleaning: Wipe the surface regularly with a soft, damp cloth to remove dust and fingerprints.
- Avoid Harsh Chemicals: Do not use abrasive cleaners, solvents, or harsh chemicals, as these can damage the powder-coated finish.
- Check Fasteners: Periodically check the mounting screws for tightness. If the knob feels loose, gently tighten the screws to ensure secure attachment.
7. Troubleshooting
If you encounter any issues with your KOTARBAU Door Knob, refer to the following common troubleshooting tips:
- Knob is Loose: If the door knob feels wobbly or loose, check the mounting screws on both sides of the door. Tighten them gently with a screwdriver until the knob is secure.
- Knob is Stiff or Hard to Turn:
- Ensure the knob was installed correctly and is not binding against the door surface or the latch mechanism.
- Check for any obstructions around the spindle or latch.
- A small amount of silicone-based lubricant can be applied to the internal mechanism if stiffness persists, but avoid oil-based lubricants that can attract dust.
- Door Does Not Latch Properly:
- Verify that the strike plate on the door frame is correctly aligned with the latch bolt. Adjust the strike plate if necessary.
- Ensure the latch bolt extends fully when the knob is released.
8. Warranty and Support
KOTARBAU products are known for their quality and precision. All items undergo multiple tests to ensure reliability. While specific warranty details are not provided in this manual, KOTARBAU stands by the quality of its products.
For further assistance, technical support, or inquiries regarding your KOTARBAU Door Knob, please contact KOTARBAU customer service through their official channels or the retailer where the product was purchased.