J Top Mount Heavy Duty Bifold Barn Door Hardware Kit | 4 Door One Way

Panel weight: Up to 200 lbs per panel with the standard steel wheels. Four panels works out to 800 lbs across the system, though that's the per-panel rating multiplied out rather than a separate limit. With the Delrin wheel upgrade, the limit is 100 lbs per panel — check your panel weight against that before selecting it.

Maximum panel size: 48 in wide × 108 in tall per panel.

Panel thickness: 1-3/8 in to 2-1/4 in. Because the hangers fasten to the top edge rather than through the panel face, one kit covers the whole range — there's no thickness variant to select. For thinner panels, 1-1/4 in to 1-3/8 in, standard duty is the right tier.

Wheels: Color-matched steel ships standard and carries the full 200 lbs per panel. Delrin is available as an upgrade for quieter operation, in black only, rated to 100 lbs per panel.

Panel width: Sized on total panel width — all four panels combined — rather than the rough opening. See the sizing section below for formulas and worked examples.

Panel height: Opening height + 1 in. That leaves 5/8 to 1-1/4 in of floor clearance, adjustable at the wall-mounted pivot during installation — useful over uneven flooring or thick carpet.

Ceiling clearance above door: 6-1/2 in required between the top of the door panels and the ceiling — 1 in more than standard duty, because of the heavier pivot and hanger assembly. Measure before committing to a tier.

Wall clearance on stack side: For a fully clear opening, 10 in of clear wall — the four panels fold into two 2-panel folds, each 5 in deep. On the pivot side, a minimum of 1/2 in between the track end and any adjacent wall or trim, so the pivot panel can rotate freely. No stacking space is needed there.

Room depth on the stack side: When the panels fold open they swing perpendicular to the wall, so the folded stack reaches into the room by the panel width plus 1/2 in — on 27 in panels that's 27-1/2 in. At heavy duty panel sizes this is a real footprint. Check that nothing occupies it: a hallway, an appliance door, or a swinging cabinet on the stack side can rule the configuration out.

Wall header: A 1×6 hardwood header board is the minimum for every installation — oak, maple, or poplar, not pine. It spreads the load and decouples the track's bolt spacing from your stud spacing, since the track's mounting holes rarely line up with studs. At 200 lbs per panel across four panels this matters more than anywhere else in the bifold line, and the board must run continuously across any track joint. Extend it past the track to the next stud or structural support point on each side. Never mount to drywall alone. Ceiling mount is not compatible with bifold hardware, so a solid header is the only mounting route.

Trim beside the opening: Casing, baseboard, or other trim projecting up to 1/2 in is already handled — the kit ships spacers that stand the track off the wall, with nothing extra to buy. If your trim projects more than 1/2 in, email us with the measurement before ordering.

Origin: Colorado — made to order by Goldberg Brothers in Littleton

Lead time: 10-15 business days

Finishes: All 17 Goldberg Brothers colors

Weight capacity: 200 lbs per panel with steel wheels — 800 lbs across four panels · 100 lbs per panel with the Delrin upgrade

Panel thickness: 1-3/8 in to 2-1/4 in — one kit covers the full range

Maximum panel size: 48 in wide × 108 in tall

Track lengths: 48 in, 56 in, 60 in, 64 in, 72 in, 80 in, 84 in, 96 in, 112 in, 120 in, 128 in, 144 in, 168 in, 192 in

Track sections: Anything over 7 ft 6 in ships in multiple sections with joining plates included

Hanger style: J top mount only — required for one-way stacks of more than two panels

Hanger mount: Top edge of panel — no hardware on any door face

Wheels: Color-matched steel standard · Delrin available as an upgrade, black only, 100 lbs per panel

Track centerline height: Door height + 1-5/8 in + your floor gap (5/8 to 1-1/4 in) — unlike sliding hardware, the bifold figure doesn't already include the floor gap

Ceiling clearance: 6-1/2 in above door panels

Door-to-wall clearance: 1/2 in

Floor gap: 5/8 to 1-1/4 in — adjustable at the pivot during installation

Stack depth: 10 in on the stack side, 1/2 in minimum on the pivot side

Pivot type: Wall-mounted sidewall bracket and plate (included)

Pull handle: One 7 in pull handle included, for the outermost panel

Trim clearance: Spacers included — clears trim projecting up to 1/2 in

Soft close: Not available for any bifold configuration

Ceiling mount: Not compatible with bifold hardware

Returns: The listed track lengths are stock sizes and return under the standard window — 25 days from delivery with pre-approval and a 25% restocking fee. Designer colors are custom orders and can't be returned, which leaves 8 of the 17 colors returnable. See our return policy

Warranty: Limited lifetime warranty against manufacturing defects. Hardware is sold as rustic-finished, so minor marks and patina are characteristic rather than defects.

For bifold sizing across all six configurations see our bifold measuring guide. For general pre-order measurements see our measuring guide.

A 4-door one-way kit is a heavy duty 2-door set with an extra rolling hanger and a second set of hinges — one continuous chain of four panels rather than two independent stacks.

• Pre-punched track (1), in your selected length — supplied in multiple sections with joining plates on lengths over 7 ft 6 in
• Fixed top-mount hanger (1) · Loose top-mount hangers (2) — three hangers total, all attaching to the top edge of the panels
• 2-1/2 in wood screws for top-edge hanger attachment
• Hex bolts, 3/8 in spacers, and flange nuts for the roller assemblies
• Hinges (12) · 1 in hinge screws — four hinges at each of the three fold points, with three of the four used on panels 7 ft tall or under
• Sidewall bracket (1) · sidewall pivot plate (1) — wall-mounted heavy duty pivot assembly at the fixed end
• Door bottom plate (1) · pivot pin (1) · 5/16 in lock washer (1) · 5/16 in nut (1)
• Track stops (2) · rubber bumper band (1) · felt strips (1)
• 5 in hex lag bolts, fender washers, and 1-5/8 in wood screws for track mounting — quantity scales with your track length
• 1/2 in and 1-1/4 in spacers for the track standoff
• Wrench (1)
• 7 in pull handle (1), for the outermost panel

The fixed hanger goes on the pivot-side panel, which attaches to the wall-mounted pivot. The two loose hangers travel freely along the track as the panels fold. The outermost panel carries the pull handle and is the one you grip to open and close.

Trim clearance spacers are included — 1/2 in and 1-1/4 in, for standing the track off the wall to clear projecting casing or baseboard up to 1/2 in. Nothing extra to select.

Fastener finish: clear zinc with Raw Steel, Silver Metallic, and PC Chrome; black oxide with Matte Black Texture, Bronze Texture, Black, and Arch Bronze; powder coated to match on the remaining ten colors — Jacob's Gold, Rustic Brown, Regal Red, Rocket White, Blue Ribbon, Flint Gray Texture, Dark Gray Texture, White Bronze Texture, Silver Vein, and Copper Vein. Because the hangers mount to the top edge, none of it lands on the panel faces. The lag bolts securing the track to the wall do sit on the track face and are visible after install, so on the seven finishes that don't ship matched, the touch-up paint option lets you paint them.

A latch and flush pull are not included — add them before ordering to avoid a second shipment. Soft close is not compatible with bifold hardware.

This kit includes one 7 in pull handle and trim clearance spacers for trim up to 1/2 in. A latch and flush pull are not included:

• Latch: Keeps the door closed deliberately — browse our latches collection
• Flush pull: For the wall-facing side if the door is operated from both sides — browse our flush pulls collection
• Delrin wheel upgrade: Quieter than the standard steel wheels, black only, and limited to 100 lbs per panel — select it above if your panels are within that
• Touch-up paint: For painting the visible track bolt heads on finishes that don't ship matched — select it in the options above

4-door one-way sizing is based on total panel width — all four panels combined — not the rough opening. The track length you select equals your total panel width. For a full walkthrough of all six configurations see our bifold measuring guide.

Minimum coverage (doors close over the opening with a small overlap on each side):

Total panel width = opening + 3 in · Each panel = (opening + 3 in) ÷ 4

Example: 96 in opening → total = 99 in → each panel = 24.75 in, round up to 25 in

Fully clear, symmetrical (recommended — the panels extend equally past both sides of the opening, so the closed doors look centered):

Total panel width = opening + 20 in · Each panel = (opening + 20 in) ÷ 4

Example: 96 in opening → total = 116 in → each panel = 29 in

The +20 in constant is the stack depth doubled: 10 in of folded panels on the stack side, matched on the other side so the closed doors sit centered over the opening. It scales with panel count rather than opening size — a 2-door needs +10 in, a 6-door +30 in.

The track lengths listed in the options above are stock sizes, 48 in through 192 in. They ship as ordered and return under the standard 25-day window. Note that 192 in of track is four 48 in panels, which is this kit's maximum panel width — if your calculation runs past 192 in total, you need more panels in a larger configuration rather than a longer track. Lengths over 7 ft 6 in ship in multiple sections with joining plates included, and your header board needs to run continuously across the joint.

For a length outside those options, email us at info@thebarndoorhardwarestore.com — priced the same as the next standard size, but a track cut to order is a custom order and can't be returned, so confirm your measurement first.

Goldberg Brothers hardware uses sealed bearings that run dry. Do not lubricate the track or rollers. Silicone spray, WD-40, and white lithium grease all attract dust, build up in the channel, and make the doors harder to fold, not easier. If the panels start to drag or squeak, the cause is almost always debris in the track or a pivot that needs adjusting — wipe the track channel with a dry cloth and check that the hardware is still tight. On a four-panel stack, also check the hinge screws at all three fold points, since folding puts repeated load on them — and more so at these panel weights.