What you're replacing and why it matters

Bifold door hardware includes the track (the metal channel the doors roll on), the rollers (the wheels that sit inside the track), the pivot brackets (which anchor the doors at top and bottom), and the handles. When a bifold door sticks, won't close flush, or hangs unevenly, the problem is usually worn rollers or a bent track. Replacing hardware is simpler than replacing the doors themselves, and you can do most of it with basic tools.

The hardware you buy must match your door width and weight. A standard interior bifold door is 24 to 36 inches wide per panel; exterior or heavier doors need heavier-duty hardware. Before you start, measure your door opening and check the existing hardware for a brand name or part number — that tells you what replacement kit to buy.

Key Takeaways

  • Bifold door hardware includes the track, rollers, pivot brackets, and handles, and worn rollers or a bent track are the most common reasons doors stick or hang unevenly.
  • Measure your door opening and find the brand name or part number on existing hardware so you buy the correct replacement kit.
  • You will need to remove the doors from the frame before replacing track or rollers, which takes a screwdriver, adjustable wrench, and a helper to hold the door steady.
  • Pivot brackets and handles can often be replaced without removing the doors, but track and roller replacement requires the doors to come out.
  • If the track is bent or the frame is out of square, replacing hardware alone will not fix the problem — you may need to call a carpenter.

Measuring and buying the right hardware kit

Bifold hardware comes in kits matched to door width and weight. Measure the opening width (the distance between the left and right frame sides) and the height from floor to header. Write down both numbers. Then look at the existing hardware — the track usually has a brand stamped on it, or the pivot bracket has a part number. Take a photo of any markings you find.

Go to a home center or order online using that brand and part number. If you cannot find the original brand, measure the track width (the distance across the channel opening) and the roller diameter (usually 1 to 1.5 inches). Tell the hardware supplier your door width, height, and whether the doors are interior or exterior. They will tell you which kit fits. Do not guess — mismatched hardware will not roll smoothly and may damage the doors.

Removing the doors safely

Close the doors and look at the pivot brackets at the top and bottom of the leading edge (the edge that closes last). You will see a screw or bolt holding each bracket to the door frame. Open the doors fully and prop them there with a wooden wedge or shim under each door so they do not swing closed while you work.

Loosen (but do not remove) the adjustment screws on the top pivot bracket — these are usually on the side of the bracket facing the room. Loosen them just enough that the door lifts slightly off the track. Have a helper hold the door steady while you remove the bottom pivot bracket bolt completely. Lift the door straight up and out of the track, then set it flat on a padded surface like a blanket or cardboard. Repeat for the second door if you have one.

Replacing the track

If the track is bent, dented, or the doors were rubbing inside it, you need to replace it. The track is bolted or screwed to the header (the horizontal beam above the opening). Look inside the track channel for bolts or screws every 12 to 16 inches. Use an adjustable wrench or socket set to remove them. Slide the old track out of the frame.

Clean the header surface where the track sat — remove dust and any old caulk. Lay the new track in place and align it so it is level (use a spirit level). Start all the bolts or screws by hand first, then tighten them in a crisscross pattern so the track sits evenly. Do not over-tighten; you only need the track snug against the header. If the frame is visibly out of square (the opening is wider at the top than the bottom, or leans to one side), the track will never sit right — call a carpenter before you go further.

Replacing rollers and adjusting the pivot brackets

With the doors out, look at the bottom of each door where the rollers sit. The rollers are usually held in a bracket by a bolt or pin through the axle. Remove that bolt or pin and slide the old roller out. Slide the new roller in (it must be the same diameter and width as the old one) and reinstall the bolt or pin. Spin the roller by hand — it should turn freely with no grinding or resistance.

Check the pivot brackets at the top and bottom of the leading edge. If they are bent or cracked, replace them now — unbolt the old bracket and bolt the new one in the same location. The bracket must be perpendicular to the door edge, or the door will hang at an angle. Use a small square to check before you tighten the bolts fully.

Reinstalling the doors and adjusting them

Lift the first door and guide the bottom roller into the track. The roller should sit in the channel with the wheel touching the bottom of the track. Lower the door gently and align the top pivot bracket with the top pivot socket (the hole or cup in the header). Push the door up into the socket until it seats fully. The door should hang freely without binding.

Tighten the top pivot bracket adjustment screws gradually — a quarter turn at a time — while watching the door. If the door tilts away from the frame, tighten the screw on the side it is tilting toward. If it tilts toward the frame, tighten the opposite screw. The goal is for the door to hang plumb (straight up and down) and parallel to the frame. Repeat for the second door. Close both doors and check that they meet in the middle without rubbing or leaving a gap. If they do not, adjust the bottom roller bracket forward or backward slightly until they close flush.

Replacing handles and catches

Handles and magnetic catches are the easiest hardware to replace. The handle is usually bolted through the door from the inside. Remove the bolts, slide the old handle off, and slide the new one on. Tighten the bolts snugly but not so hard that you crack the door. The magnetic catch is bolted to the frame at the top or bottom where the doors meet. Remove the bolts, slide the old catch out, and bolt the new one in the same spot. Make sure the magnet faces the door so it pulls the door closed.

After you install the new catch, test it by closing the doors and listening for a click. The catch should hold the doors closed without you having to push them. If the catch does not hold, move it slightly closer to or farther from the door edge until it grabs firmly.

When to call a professional

If the frame is out of square, the header is sagging, or the doors are warped, hardware replacement alone will not fix the problem. A carpenter can check the frame with a level and square, and can shim or adjust the frame so the doors hang correctly. If you replace the hardware and the doors still stick, bind, or hang unevenly after adjustment, stop and call a carpenter — forcing the doors can damage them further.

If you are not comfortable removing the doors or working with bolts and brackets, a handyperson or door specialist can do the work in an hour or two. The labor cost is usually less than the cost of new doors, so it is worth the call if you are unsure.

Frequently Asked Questions

Can I replace just the rollers without removing the doors?

No. The rollers are bolted to a bracket underneath the door, and you cannot reach that bolt while the door is hanging in the track. You must remove the doors first. The job takes longer if you have to take the doors out, but it is the only way to do it right.

What if the new hardware does not fit the old holes?

If the new bracket holes do not line up with the old ones, you can drill new holes in the door or frame. Mark the new hole locations with a pencil, use a drill bit slightly smaller than the bolt diameter, and drill straight through. Fill the old holes with wooden toothpicks and wood filler if they are in visible wood, or leave them if they are in the frame behind the door.

How do I know if the track is bent or just dirty?

Run your finger along the inside of the track channel. A bent track will have a ridge, dent, or flat spot you can feel. A dirty track feels rough but smooth out when you wipe it with a damp cloth. If the doors roll smoothly after you clean the track, you do not need to replace it. If they still bind or stick after cleaning, the track is bent and needs replacement.

Do I need to replace both doors if only one is sticking?

Not necessarily. If one door has worn rollers or a bent bracket, replace just that door's hardware. If the track is bent, it affects both doors, so you should replace the track. Check both doors for wear before you buy parts.

What is the difference between interior and exterior bifold hardware?

Exterior hardware is heavier and uses larger rollers and thicker track to handle the weight of solid wood or composite doors. Interior hardware is lighter and designed for hollow-core or thin doors. Using interior hardware on an exterior door will cause the rollers to wear out quickly and the track to bend. Always match the hardware to the door type.