Long throw bolt see buying a deadbolt.
How to make a 2 way lock on a door.
After a bit of research i found a device in which you can use the door latches hole.
Twist to lock deadbolt lock keyless twin lock keyed alike with 10keys lathe finish after 304 stainless steel casting front door lock single cylinder deadbolt and door knob with keyless locking design.
Check all exterior doors.
Remove the two screws from the latch plate on the edge of the door and remove the latch from the opening.
In some cases door latch plate mortises might need to be cut or enlarged.
Begin by removing the screws from the door knob on the interior side of your door.
Most external doors are pre drilled for deadbolts making installation easy.
I needed to lock a toilet door from the inside the other day and there was no lock.
Not being able to wait for shipping i improvised using a bit of kitchen hardware.
Designed as extra security for exterior doors.
For use in combination with a door knob lever lock.
A secure entry starts with a solid door and a grade 1 or grade 2 deadbolt with a solid 1 in.
Any exterior door that only has a lock in the doorknob isn t secure.
Mark the center of the barrel hole on the edge of the door with an awl then mark center of the hole for the deadbolt on the face.
Models are available with single and double cylinder functions.
Electronic door locks use an electronic keypad instead of a key.