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WD-40 can temporarily silence a squeaky door hinge, but it is not recommended as a long-term solution. While it is effective at breaking down rust and grime, it contains very little lubricant and evaporates quickly. Using WD-40 can also attract dirt and dust to the hinges, which may cause more wear and tear over time. For a more lasting fix, after cleaning the hinge, apply a true lubricant. Better options include silicone spray, white lithium grease, metal or plastic lubricants, or oil-based products like petroleum jelly.

The difference between a mortise latch and a tubular latch is how they're mounted. A mortise latch has a single integrated lock body. One long rectangular space is cut into the door to contain it. A single keyhole is used to unlock both the dead bolt and latch from the outside. A tubular latch is a standard setup with a dead bolt separate from the regular spring bolt latch.

To maintain commercial doors and prolong their lifespan, regularly inspect and tighten hinges, lubricate locks and moving parts, and check weatherstripping for air leaks. For automatic doors, it is also important to clean the sensors to prevent costly repairs.

Continuous hinges are some of the sturdiest hinges available, which makes sense, given that they provide support along the entire side of the door. These hinges are often used for heavy commercial doors, but are impractically expensive and unnecessary for residential use. Among the hinges commonly used in homes, the ball-bearing hinge is the strongest, and it reduces friction to help heavy doors open more smoothly.