A latch is a device that is fitted into the door that allows a door handle or door knob to retract it.
- Latches are generally not sold with door handles. They need to be ordered separately
- Latches come complete with striker plate and screws
- Latches come in three backsets; 45mm, 60mm and 70mm. 60mm backset is the standard and by far the most common.
The quality of latches can vary greatly.
- One of the more common issues is the quality of the hub. This is the square part where the spindle goes through. The 3 main materials used are nylon, zinc alloy and brass. The best quality ones are made of brass and the least best are nylon.
- Many latches today are double sprung. This means that they have springs to help keep a lever handle up as well as return the latch to the outward position.
- Double sprung latches can be too stiff for round knobs. Round knobs are harder to turn as there is no leverage. If you wish to install round knobs, make sure that the latch you use does not give too much resistance.