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

Panel weight: Up to 200 lbs per panel · 800 lbs total system (4 panels). For panels under 100 lbs each, Delrin wheel upgrade is available (black finish only) for quieter operation.

Panel width: Sized based on how much coverage you need over the opening — see the panel sizing section below for formulas and worked examples.

Panel height: Opening height + 1 in. Leaves 5/8 to 1-1/4 in of floor clearance, adjustable at the wall-mounted pivot during installation.

Panel thickness: 1-3/8 in to 2-1/4 in. For thinner panels (1-1/4 to 1-3/8 in), standard duty hardware is the right choice.

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

Ceiling clearance above door: 6-1/2 in required between the top of the door panels and the ceiling.

Wall clearance on stack side: For a fully clear opening, 10 in of clear wall is needed on the stack side — four panels fold into two 2-panel folds, each taking 5 in of depth, for 10 in total. A minimum 1/2 in clearance is also required between the end of the track and any adjacent wall on the pivot side — this space allows the pivot-side panel to rotate freely during operation.

Wall header: A solid header above the opening is required for track mounting. If there is no existing header or backing in the wall, we recommend installing a minimum 1×6 hardwood board (3/4 in thick × 5-1/2 in wide) that extends past the length of the track to the next stud or structural support point on each side. Ceiling mount is not compatible with bifold hardware.

Brand: Goldberg Brothers — made to order in Colorado, USA

Lead time: 10–15 business days

Finishes available: All 17 Goldberg Brothers powder coat finishes

Weight capacity: 200 lbs per panel · 800 lbs total system

Panel thickness: 1-3/8 in to 2-1/4 in

Maximum panel size: 48 in wide × 108 in tall

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

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

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

Hanger style: J top mount only — required for 4-panel one-way stacks

Pull handle: One 7 in pull handle included — on the outermost panel

Wheels: Steel (standard) · Delrin upgrade available for panels under 100 lbs each, black finish only

Soft close: Not available for bifold hardware

Ceiling mount: Not compatible with bifold hardware

Warranty: Limited lifetime warranty

For bifold-specific sizing formulas see our bifold measuring guide. For general pre-order measurements see our measuring guide.

• Pre-punched track (1) — custom cut to your specified length
• 2 rolling hangers/rollers · 1 fixed pivot hanger (3 hangers total) — all attach to the top edge of the door panels via wood screws
• Anchors and screws for top-edge hanger attachment
• Hex bolts and flange nuts for roller assembly
• Hinges and hinge screws — 3 sets connecting the 4 panels at each fold point
• Sidewall pivot bracket and plate (1 set) — wall-mounted heavy duty pivot assembly
• 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 strip (1)
• 5 in hex lag bolts · spacers · fender washers · wood screws
• Wrench (1)
• 7 in pull handle (1) — for the outermost panel

The fixed panel attaches to the wall-mounted pivot bracket. The outermost panel carries the pull handle and is the one you grip to open and close. All four panels connect in a chain by hinge sets at each fold point. No hardware mounts to any door face.

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. 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: For panels under 100 lbs each — quieter than the standard steel wheels. Available in black finish only.

4-door one-way sizing is based on total panel width — the combined width of all four panels — not the rough opening. The track length you select should equal your total panel width. For a full walkthrough 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: 80 in opening → total = 83 in → each panel = 20.75 in, round up to 21 in

Fully clear — symmetrical (recommended) (equal overlap on both sides):
Total panel width = opening + 20 in · Each panel = (opening + 20 in) ÷ 4
Example: 80 in opening → total = 100 in → each panel = 25 in

The symmetrical layout ensures the installation looks balanced over the opening when closed, even though all panels stack to one side when open. If neither symmetry nor a fully clear opening matters for your installation, the minimum coverage formula is sufficient and uses narrower panels. Goldberg Brothers tracks are custom-cut to your specified length. If the size you need isn't listed, email us at info@thebarndoorhardwarestore.com — custom lengths are priced the same as the next standard size.