Patio Door Hardware
Hook style
surface mount handles
Patio door hardware items such as surface mount patio door locks are used on wooden, aluminum and vinyl patio doors. The locks pictured below are universal because they all share the same 4-15/16 inch center dimension that is commonly used in the patio door industry. 4-15/16 inch center dimension universal locksThe first one has a very low profile inside and outside handle or pull. This is used when there is very little space between the patio door and the screen door on the outside. It also helps if your curtains or blinds are close to the door on the inside and you dont want to snag them. 
This lock has a thicker wooden handle and uses an anti lift feature. The metal tab, just above the hook sticks out so that when the door is locked, the patio door cannot be lifted up from outside to make the door unlock. 
Another lock with the anti lift feature, this one has an all metal handle. 
6.575 inch center dimension universal locksThe next pair of locks use a 6.575 inch center to center dimension. These could be used to retrofit a lock on your patio that share this same dimension. 
The picture above shows a typical surface mount patio door handle with a hook style lock built into the inside handle. This lock has a grab handle on the outside as well. 
This lock is almost identical to the previous picture except that it has a pull instead of an outside handle. The Pull is smaller than a grab handle and is used on the majority of patio doors with this style of patio door hardware. 2-11/16 inch center dimension universal locksAnother surface mount type lock with a center to center dimension of less than 4 inches. 
When it comes to patio door hardware, there are not really many parts used in your average sliding patio door. Apart from the frames of the sliding doors themselves, there are panel clips, rollers, locks and perhaps a handle or two
Panel ClipsPanel clips are a kind of patio door hardware more often seen on aluminum patio doors. The panel clips hold the window panels into the door frame. They are supposed to be mounted on the inside. I've seen some patio door installations where the panel clips were mounted on the outside. This is dangerous because any intruder can take the panel clips off with a screwdriver and slide the glass panel over and get entrance to your house. Keep the panel clips on the inside where they cant be tampered with. They can be plastic or steel. Plastic clips often have rubber bumpers molded into them so they act as door stops for the sliding door. Metal clips are the most secure because they are much more difficult to break than plastic. Panel clips have been made in all sorts of shapes and sizes over the years. But you can often find one thats close enough to fit when you are replacing a broken clip.
Patio Door RollersPatio door rollers are not usually visible on a patio door since they are recessed into the bottom of the sliding door and protected by weatherstrips. Aluminum patio doors usually have one roller on each side of the door. Wooden Doors are heavier and often have a pair of rollers on each side. All rollers need periodic adjustment to keep the door square in the frame and to prevent the door from scraping on the bottom track. Usually there are adjustment holes one each end of the door. On wooden doors, the height adjustment is covered by a plastic cap on both sides of the bottom rail of the sliding door.
Patio Door Handles and LocksOn a patio door the handles are often part of the locks and are mounted on the door as one assembly. Some doors though have separate plastic or wooden handles screwed into the patio door frames. Aluminum doors have most often have locks that are built into the sliding door frame and have locks that operate by pushing a sliding latch up or down. This sliding latch has a latch hook attached to it by a screw. This screw often comes loose or falls out entirely. These latch hooks are very easy to replace simply by disassembling the two screws that hold the lock in place. Once the lock is removed its easy to tighten the latch hook screw or replace the latch hook entirely.
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