How and where to use guide
JL-HDB76GM 76mm Gun Metal Heavy Duty Tubular Dead Bolt
Typical applications and installation
This heavy-duty tubular dead bolt is ideal for external doors, garden gates, sheds, and commercial premises where security and weather exposure are concerns. The 76mm projection provides substantial throw length for secure engagement with the striking plate. Install on timber or composite doors by drilling a hole to accommodate the tubular mechanism, then secure the bolt body to the door edge using the provided fixings. Ensure the striking plate is properly aligned and securely fastened to the door frame to maximise security and prevent forced entry.
- Suitable for external doors, gates, and outbuildings
- 76mm projection ensures strong bolt throw
- Compatible with standard door frames and timber construction
- Requires drilling for installation — use appropriate hole saw size
- Position at mid-height on door for optimal security and accessibility
Weather resistance and maintenance
The gun metal finish provides excellent corrosion resistance, making this bolt suitable for exposed external locations and coastal environments. To maintain performance, periodically clean the bolt mechanism with a dry cloth to remove dirt and salt deposits. Apply a light machine oil or silicone-based lubricant to the moving parts annually, particularly in harsh weather conditions. Avoid abrasive cleaners that may damage the gun metal finish.
- Gun metal finish resists rust and corrosion
- Suitable for coastal and exposed locations
- Clean regularly with a dry cloth
- Lubricate annually with light machine oil or silicone spray
- Do not use abrasive cleaning materials
On-site fitting tips and limitations
Measure and mark the bolt position carefully before drilling to ensure accurate alignment with the striking plate. Use a sharp hole saw at the correct diameter to prevent splintering on timber doors. Check that the bolt operates smoothly through its full travel before final fixing. This is a manual dead bolt requiring a key for operation — ensure keys are kept secure and spare keys are stored safely. The bolt is not suitable for use on metal doors without appropriate adapters, and cannot be used with electronic locking systems without modification.
- Mark position carefully to ensure striking plate alignment
- Use sharp hole saw to prevent timber splintering
- Test full bolt operation before final installation
- Manual key operation only — keep keys secure
- Not compatible with metal doors without specialist fixings
- Cannot be integrated with electronic locking without modification