Deadlocks: Strong Security for External Doors

Deadlocks provide a simple and robust form of security by locking the bolt into the door frame without a spring mechanism. They are commonly used on external doors and garages where extra resistance to forced entry is required.

Choosing the right deadlock

Select a deadlock with suitable bolt throw and material strength for the door type. Consider whether a single- or double-cylinder model is appropriate — double-cylinder locks require a key both sides and add security, while single-cylinder options allow emergency egress from the inside.

Key characteristics to look for

• Solid steel or brass bolts for enhanced strength.
• Certification to recognised security standards where required.
• Weather-resistant finishes for external use.
• Compatibility with existing strike plates and frames.
• Keyed-alike options for convenience across multiple doors.

Proper alignment between the bolt and strike plate is essential for reliable operation. For added protection, combine deadlocks with other measures such as reinforced doors and hinges. When budget is a concern, inspected refurbished units or clearance items may offer savings, but prioritise certified, quality parts for primary security doors.