J Top Mount cabinet barn door hardware kit in matte black with a single track, shown installed on a small wooden cabinet door.

An instructional diagram titled 'How to Calculate Single Door Track Length'. The primary formula shown is: Track Length = 2 x Door Width. Additional formulas are provided to determine door size: Door Width = Opening Width + (2 x Molding Width, or 4 inches if no molding). Door Height = Opening Height + (Molding Height, or 2 inches if no molding) - 1/2 inch.

An instructional diagram showing a closed barn door and titled 'How to Calculate Single Door Track Length'. The primary formula is: Track Length = 2 x Door Width. Additional formulas for door size are: Door Width = Opening Width + (2 x Molding Width, or 4 inches if no molding). Door Height = Opening Height + (Molding Height, or 2 inches if no molding) - 1/2 inch.

Instructional diagram: 'How to Calculate Double Door Biparting Track Length'. The main formula is: Track Length = 4 x Door Width. To find the size for each of the two doors, the formulas are: Door Width = [Opening Width + (2 x Molding Width, or 4 inches if no molding)] / 2. The Door Height formula is: Door Height = Opening Height + (Molding Height, or 2 inches if no molding) - 1/2 inch.

Instructional diagram showing a pair of closed biparting doors, titled 'How to Calculate Double Door Biparting Track Length'. The main formula is: Track Length = 4 x Door Width. To find the size for each door, the formulas are: Door Width = [Opening Width + (2 x Molding Width, or 4 inches if no molding)] / 2. The Door Height formula is: Door Height = Opening Height + (Molding Height, or 2 inches if no molding) - 1/2 inch.

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J Top Mount Cabinet Barn Door Hardware Kit | Matte Black

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Starts at:

$94.99

Track Length: 24in

Door Hardware: Hardware for 1 Cabinet Door

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The J top mount cabinet barn door hardware kit in matte black is a compact sliding hardware system designed for cabinet doors, pantry doors, TV stands, and other small-scale applications — with no hardware visible on either door face. Where a J-strap hanger mounts to the front face of the door, the J top mount roller attaches to the top edge of the panel, leaving both door faces completely clear while the J-style roller arm remains visible above. A floor-mounted T-guide is included to keep the bottom of the door tracking straight.

This is a quick-ship kit — in stock and ships in 2–3 business days. Track lengths are available from 24 in to 120 in. The 2-door option configures the hardware for a biparting setup — two panels sharing one track, splitting from the center.

If the J-strap curve across the door face is part of your design intent, see our J-strap cabinet kit in the same finish. For custom track lengths, all 17 Goldberg Brothers powder coat finishes, or doors heavier than 50 lbs, see our Goldberg Brothers mini top mount cabinet kit, made to order in 10–15 business days.

Door weight: Up to 50 lbs total system. For heavier doors see our Goldberg Brothers mini top mount cabinet kit (75 lbs capacity).

Door width: Opening + 4 in for standard coverage (2 in overlap each side); opening + 6 in for more coverage. Minimum overlap is 1/2 in per side. For biparting, each panel = (opening + 4 in) ÷ 2. See the track length section below for worked examples.

Door height: Opening height + 1 in. Leaves approximately 1/2 to 1 in of floor clearance.

Door thickness: 1/2 in to 1-1/4 in.

Clearance above cabinet door: 4 in required between the top of the door panel and any obstruction above — cabinet frame, shelf, or ceiling.

Backing above opening: A solid backing above the opening is required for track mounting — typically the cabinet frame, a reinforced header, or a hardwood board. If there is no solid backing, install a minimum 1×6 hardwood board (3/4 in thick × 5-1/2 in wide) that extends past the track to the next structural support point on each side.

Lead time: Ships in 2–3 business days

Finish: Matte black

Weight capacity: 50 lbs total system

Door thickness: 1/2 in to 1-1/4 in

Track width: 1 in

Track thickness: 3/16 in

Clearance above cabinet door: 4 in

Track lengths available: 24 in · 30 in · 36 in · 39 in · 42 in · 48 in · 54 in · 60 in · 66 in · 72 in · 78 in · 84 in · 90 in · 96 in · 102 in · 108 in · 114 in · 120 in

Floor guide: Floor-mounted T-guide included

Hardware quantities vary by track length — check the included instruction sheet before installation.

Flat track (1) — in your selected length
Mini steel J top mount hangers/rollers (2) · hanger/roller screws (4) — attach to the top edge of the door panel
Anti-jump pads (2)
Floor-mounted T-guide (1)
Door stoppers (2)
Hex wrench (1)
Junction plate (1) — for joining track segments on longer spans
Spacers · lag bolts · washers — quantities vary by track length

No hardware mounts to either door face. For the 2-door biparting option, select "Hardware for 2 Cabinet Doors." Hanger/roller sets, anti-jump pads, floor-mounted T-guides, and door stoppers are all doubled — both panels share the single track.

A pull handle, latch, and flush pull are not included — add them before ordering to avoid a second shipment.

No pull handle, latch, or flush pull is included with this kit:

Pull handle: For opening and closing the door — browse our barn door handles

Latch: Keeps the door closed deliberately — browse our latches collection

Flush pull: For the wall-facing side if operated from both sides — browse our flush pulls collection

The track must be at least twice the door width to allow the door to slide fully clear of the opening. Select the track length closest to your requirement, rounding up to the next available size.

Door width: Opening + 4 in for standard coverage (2 in overlap each side). Minimum 1/2 in per side.

Track length: 2× door width.

Single door example: 18 in opening → door width = 18 + 4 = 22 in → track = 44 in → select 48 in track.

Biparting (2-door) example: 36 in opening → each panel = (36 + 4) ÷ 2 = 20 in → track = 2 × combined panel width = 2 × 40 = 80 in → select 84 in track.

If the track length you need isn't listed, round up to the next available size. For lengths beyond 120 in or for custom sizing, see our Goldberg Brothers mini top mount cabinet kit, which offers custom lengths up to 144 in.

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Common Questions

What's the difference between this kit and the Goldberg Brothers mini top mount cabinet kit?

Lead time, capacity, and options. This kit ships in 2–3 business days from stock, in matte black only, with fixed track lengths up to 120 in and a 50 lb total capacity. The Goldberg Brothers mini top mount kit is made to order in 10–15 business days but offers all 17 powder coat finishes, custom track lengths up to 144 in, and a 75 lb per door capacity. If your cabinet door is on the heavier side, needs a specific finish, or requires a non-standard track length, Goldberg Brothers is the right choice.

What does the floor-mounted T-guide do?

The floor-mounted T-guide installs directly below the door panel. A small slot in the bottom edge of the door slides over the T-guide, keeping the door tracking straight and preventing it from swinging away from the wall. It is compatible with all door thicknesses in the supported range (1/2 to 1-1/4 in) and does not require adjustment. Installation requires two small screws into the floor. If you have finished flooring you'd prefer not to drill into, see our wall-mounted floor guides as an alternative.

What's the difference between J top mount and J-strap for cabinet hardware?

The hanger attachment point. The J-strap kit mounts to the front face of the door — a straight strap is visible across the door face, with the J-curve wrapping over the roller above and is part of the aesthetic. J top mount attaches to the top edge of the panel, leaving both door faces completely free of hardware. The J-style roller arm is still visible above the door, but the panels look clean from the front. Capacity, track dimensions, and all installation requirements are identical between the two styles.

What's the biparting (2-door) option?

The 2-door option includes hardware for two panels that share one track and split from the center — each panel slides to one side when open. Select "Hardware for 2 Cabinet Doors." The track length must be double the combined width of both panels.

Can I use this for a full-size interior door?

No — this kit is designed for cabinet doors and small panels. The 50 lb total system capacity and 1-1/4 in maximum door thickness rule out most standard interior doors. For full-size applications, see our standard barn door hardware kits.

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info@thebarndoorhardwarestore.com

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Why Thousands Choose The Barn Door Hardware Store

Not all barn door hardware is built the same. Here’s how we compare.

J Top Mount Roller Measurements
Height Above Door	3-3/8 inches
Roller Thickness	1-7/16 inches
Roller Width	4-1/8 inches
Roller Height	3-3/8 inches
Wheel Diameter	1-11/16 inches
First Bolt Drop	N/A
Minimum Clearance between Top of Door and Ceiling	4 inches
Track Width	1 inch
Track Thickness	3/16 inches
Total Track Weight Capacity	50 lbs
Minimum Door Thickness	1/2 inches
Maximum Door Thickness	1-1/4 inches

Roller Type	Height Above Door	Roller Thickness	Roller Width	Roller Height	Wheel Diameter	First Bolt Drop
J-Strap	3-1/2	1-7/16	1	6	1-11/16	3/4
Straight Strap	2-5/8	1-7/16	1	5-1/2	1-11/16	3/4
J Top Mount	3-3/8	1-7/16	4-1/8	3-3/8	1-11/16	N/A
Diamond	3-1/8	1-3/8	3-1/2	6-3/4	1-11/16	1-1/4
Horseshoe	3-1/4	1-7/16	2-3/4	5-1/8	1-11/16	1-1/4
Arrow	3-1/2	1-7/16	1	6	1-11/16	3/4

J Top Mount Cabinet Barn Door Hardware Kit | Matte Black

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