look for hardware parts for metal bifold door

Greetings. We believe you have National bi-fold doors. The first photo of the top pivot, we believe you can use our 21-041. The second and fourth photo showing the slider pins, we have parts you can replace: see the 21-113 nylon slider cap, the 21-026B plain 1/4" pin, the 21-252 cone spring and the 21-155 palnut. The third photo showing the bottom pivot pin, you can use the 21-046. Finally, the fifth photo showing the nylon track pivot bracket would be our 21-204. Please review.

To install the National adjusting pin, 21-046, you will first lay down the door on a stable surface, or even just the floor. Remove all fittings from the threaded pin and slide it up from the bottom of the door. As you begin, take the black "C Clamp" and begin screwing it onto the pin with the bottom sleeve facing down into the door hole. Give the pin a few turns and attach the nylon bushing with the bump facing up to the upper door hole.

After you get the black clamp pressing against the bottom hole and the nylon against the top hole, add the steel nut and bushing on top of the door frame loosely. Now bring the door up and place the 21-046 pin into the bottom door track bracket, and the 21-041 spring loaded pivot pin into the top track bracket and snap the top and bottom guide pins into the track. With a screwdriver, turn the threaded 21-046 pin to adjust the door so that it will perform smoothly and square to the wall. When you have the door in the proper position, turn the top steel nut with washer tighter to lock the pivot pin in place.