Fixing and buying guide
JL-HDB76GM 76mm Gun Metal Heavy Duty Tubular Dead Bolt
What this product is and who it is for
This is a tubular dead bolt mechanism with a 76mm backset measurement. It is intended for external door security on residential and light commercial properties. The heavy duty construction and gun metal material make it suitable for exposed or coastal locations where standard finishes would corrode. Trade customers, property managers, and experienced DIYers installing or replacing door locks will find this appropriate for their needs.
- 76mm backset (distance from door edge to bolt centre)
- Gun metal finish for corrosion resistance
- Heavy duty tubular design for strength and security
- Suitable for external timber and composite doors
Compatibility and sizing
Before purchasing, confirm your door's backset measurement is 76mm. This is the critical dimension that determines whether the bolt will align correctly with your existing door preparation or new door blank. Measure from the edge of the door to the centre of the existing lock hole, or check your door manufacturer's specifications. The tubular format means it will fit standard cylindrical lock housings on most UK doors.
- Check your door backset is exactly 76mm
- Verify door thickness is suitable for tubular mechanism
- Confirm door material (timber or composite) is compatible
- Check existing lock housing if replacing an old bolt
What is included and pre-installation checks
Inspect the bolt mechanism on arrival for any damage to the gun metal finish or moving parts. Test the bolt operation by hand before installation to ensure smooth extension and retraction. Check that all fixings and components are present. Examine your door for any damage, warping, or rot that could affect secure installation. Ensure the lock housing is clean and free from debris.
- Test bolt movement before fitting
- Inspect gun metal finish for transport damage
- Check door is sound and not warped
- Verify lock housing is clean and correctly sized
Fixing and installation
Position the bolt mechanism into the door's lock housing, aligning it so the bolt extends and retracts smoothly without binding. Secure using the fixings provided, ensuring they are tightened firmly but not over-tightened, which could crack the mechanism or distort the door. The gun metal finish requires no special treatment after installation. Test operation from both sides before final use to confirm the bolt engages fully with the strike plate on the frame.
- Insert bolt into lock housing with care
- Align bolt so it operates smoothly
- Use provided fixings and tighten securely
- Test full extension and retraction before use