Find the keyhole. If your doorknob is accompanied by a lock, you should see a jagged slit on the outward-facing knob of the door. There should be a locking button on the inside part of the knob. The jagged slit is the keyhole. If you have a key for this door, it should fit perfectly into the keyhole and will allow anyone with that specific key to enter the premises.

Make sure that your key fits. Slide the key into the keyhole of the outer doorknob. If the key will not fit, flip it…

1. Disassemble the spherical door lock first. The sphere that can be inserted into the keyhole is the outer sphere, and the sphere without the keyhole is the inner shape. Find the small hole of the door lock, and poke the inner ball with a sharp object to take the inner ball. Unscrew the two large and small rings to align the door hole and insert the spherical door lock. The one with the keyhole should be on the outside.

2. The lock tongue is buckled with the lock body. Check whether…

Ordinary hinge: One side of the hinge is fixed on the frame, and the other side is fixed on the fan. It can be turned to open. It is suitable for wooden doors and windows and general wooden furniture.

Lightweight hinges: The hinge plates are thinner and narrower than ordinary hinges, and are mainly suitable for light wooden doors and windows and general wooden furniture.

Core-pulling hinge: The hinge axis (pin) can be pulled out. After being pulled out, the door and window sash…

A latch bolt is the part of a door that keeps the door from coming open. In order to be a latch bolt, the item needs to slide into place. This separates the latch bolt from chain locks or hooks, where the fastening mechanism is simply placed in a holder. The actual bolt may be in any number of forms, from a standard door knob fastener to a deadbolt. Latch bolts are one of the oldest forms of door-securing technology and are still very common.

Bolts were used as a way to keep doors…