Rectangular Internal Tube Plugs — Flat Head create a tight, secure seal inside rectangular tubing — no glue, no screws, no wobbling. Built with flexible ribbed walls that compress and lock into varying wall thicknesses, these plugs deliver a clean finish while protecting floors, equipment, and tubing interiors from wear, moisture, and debris. Perfect for furniture legs, metal frames, storage racks, and heavy-use structures.
Not sure what size? See the size chart ↓
📦 Sold in packs of 4 — quantity adjustable at checkout
Rectangular Internal Tube Plugs — Flat Head are designed to seal open rectangular tubing, eliminate noise, and protect floors, frames, and hands from exposed metal edges. Uncapped rectangular tubes allow dirt and moisture inside, scratch floors, and leave furniture or equipment looking unfinished. And because rectangular tubing often varies in wall thickness, basic caps loosen, shift, or fall out with movement.
Instead of rigid inserts that don’t adapt, Rectangular Internal Tube Plugs — Flat Head use a flexible compression-fit body that conforms to the inside of the tube. Ribbed sidewalls flex outward to grip securely, creating a tight, rattle-free hold with no glue, screws, or tools required — just a clean, durable finish that stays put.
Cheap caps loosen. Flat inserts shift. And once they do, noise and wear return.
Rectangular Internal Tube Plugs — Flat Head provide a long-term solution for sealing rectangular tubing in furniture, fixtures, and heavy-use applications.
If your tubing needs a clean internal-fit plug…
If loose caps rattle or wear out quickly…
If you want a reliable, long-lasting seal —
These rectangular tube plugs are built to deliver.
Your tubing stays sealed. Your equipment runs quieter. And your floors and hands stay protected.
Flexible ribs expand to match wall thickness variations, creating a strong, slip-free grip that stays locked in place under movement and pressure.
A smooth outer face caps the tube cleanly, protecting against scratches, vibration, and premature wear while improving appearance.
Press the plug in by hand or tap lightly with a rubber mallet. No glue, screws, or special hardware required.
Lightweight yet tough material designed to handle everyday use and heavier loads without cracking.
Resists cleaning agents, oils, and moisture exposure in commercial and light industrial environments.
Maintains fit and flexibility from –25 °C to 65 °C without deforming or hardening.
Available Dimensions:
Each plug is precision-molded for a snug, rattle-free fit with no trimming required.
Choose a finish that matches your equipment or use color-coding for quick identification.
✔ Rectangular tube furniture legs
✔ Industrial racks, steel trolleys, and equipment bases
✔ Retail fixtures, displays, and workstations
✔ DIY, commercial, and architectural metal structures
✔ Any rectangular tubing that needs a secure internal end plug
Measure the inner width, inner length, and wall thickness of your tubing before selecting a size. For a fully flush seat, tap lightly with a rubber mallet to compress the ribs and lock the plug securely in place.
| Specification | Details |
|---|---|
|
Product Type
|
Tube Plug – Inner with Ribs
|
|
Shape
|
Rectangular Tube
|
|
Materials
|
PE (Polyethylene)
|
|
Fit Style
|
Ribbed friction-fit compression
|
|
Floor Compatibility
|
All hard and soft floors
|
|
Furniture Compatibility
|
Chairs, benches, frames, racks, carts, retail fixtures
|
|
Leg Compatibility
|
Metal and plastic rectangular tubing
|
|
Sizes Available
|
10×20 mm to 60×120 mm, fits 0.8–4.5 mm wall thickness
|
|
Color Options
|
Black, Grey, White
|
|
Installation Type
|
Press-fit by hand or rubber mallet
|
|
Key Benefits
|
End protection, noise reduction, fast install, no trimming required
|
|
Indoor/Outdoor Use
|
Indoor | Covered Outdoor | Uncovered Outdoor
|
|
Recyclable
|
Yes
|
| Tube Dimensions (W x L) | Tube Wall Thickness (T) | Head Height (H1) | Insert Depth (H) |
|---|---|---|---|
|
10 x 30 mm (0.40" x 1.18")
|
1 – 2 mm (0.04" – 0.08")
|
3 mm (0.12")
|
12 mm (0.47")
|
|
15 x 20 mm (0.59" x 0.79")
|
1 – 2 mm (0.04" – 0.08")
|
3 mm (0.19")
|
12 mm (0.47")
|
|
15 x 30 mm (0.59" x 1.19")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
12 mm (0.47")
|
|
15 x 30 mm (0.59" x 1.19")
|
2 – 3 mm (0.0.8" – 0.10")
|
5 mm (0.19")
|
12 mm (0.47")
|
|
15 x 40 mm (0.59" x 1.57")
|
2 – 3 mm (0.08" – 0.12")
|
5 mm (0.19")
|
12 mm (0.47")
|
|
15 x 50 mm (0.59" x 1.97")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
14 mm (0.55")
|
|
18 x 30 mm (0.71" x 1.19")
|
1.5 – 2.5 mm (0.06" – 0.10")
|
5 mm (0.19")
|
12 mm (0.47")
|
|
20 x 25 mm (0.79" x 0.98")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
12 mm (0.47")
|
|
20 x 30 mm (0.79" x 1.19")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
12 mm (0.47")
|
|
20 x 40 mm (0.79" x 1.57")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
14 mm (0.55")
|
|
20 x 40 mm (0.79" x 157")
|
2 – 3 mm (0.08" – 0.12")
|
5 mm (0.19")
|
14 mm (0.55")
|
|
20 x 50 mm (0.79" x 1.97")
|
0.8 – 1.5 mm (0.03" – 0.06")
|
5 mm (0.19")
|
14 mm (0.55")
|
|
20 x 50 mm (0.79" x 1.97")
|
1.5 – 2 mm (0.06" – 0.08")
|
5 mm (0.19")
|
14 mm (0.55")
|
|
20 x 60 mm (0.79" x 2.36")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
25 x 35 mm (0.98" x 1.38")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
13 mm (0.51")
|
|
25 x 40 mm (0.98" x 1.57")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
14 mm (0.55")
|
|
25 x 50 mm (0.98" x 1.97")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
14 mm (0.55")
|
|
25 x 60 mm (0.98" x 2.36")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
15 mm (0.59")
|
|
30 x 40 mm (1.19" x 1.57")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
30 x 50 mm (1.19" x1.97")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
30 x 50 mm (1.19" x1.97")
|
3 – 4 mm (0.12" – 0.16")
|
5 mm (0.19")
|
15 mm (0.59")
|
|
30 x 60 mm (1.19" x 2.36")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
30 x 60 mm (1.19" x 2.36")
|
3 – 4 mm (0.12" – 0.16")
|
5 mm (0.19")
|
14 mm (0.55")
|
|
30 x 70 mm (1.19" x 2.76")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
30 x 80 mm (1.19" x 3.15")
|
2 – 3 mm (0.08" – 0.12")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
30 x 100 mm (1.19" x 3.94")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
30 x 110 mm (1.19" x 4.33")
|
2 – 3 mm (0.08" – 0.12")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
40 x 50 mm (1.57" x 1.97")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
14 mm (0.55")
|
|
40 x 60 mm (1.57" x 2.36")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
40 x 80 mm (1.57" x 3.15")
|
1 – 2 mm (0.04" – 0.08")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
40 x 80 mm (1.57" x 3.15")
|
3 – 4 mm (0.12" – 0.16")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
40 x 100 mm (1.57" x 3.94")
|
3 – 4 mm (0.12" – 0.16")
|
5 mm (0.19")
|
16 mm (0.63")
|
|
50 x 70 mm (1.97" x 2.76")
|
2 – 4 mm (0.08" – 0.16")
|
5 mm (0.19")
|
15 mm (0.59")
|
|
50 x 80 mm (1.97" x 3.15")
|
1.5 – 3.5 mm (0.06" – 0.10")
|
5 mm (0.19")
|
21 mm (0.83")
|
|
50 x 100 mm (1.97" x 3.94")
|
1.5 – 3.5 mm (0.06" – 0.10")
|
5 mm (0.19")
|
25 mm (0.98")
|
|
60 x 80 mm (2.36" x 3.15")
|
1.5 – 3.5 mm (0.06" – 0.10")
|
5 mm (0.19")
|
25 mm (0.98")
|
|
60 x 100 mm (2.36" x 3.94")
|
2.5 – 4.5 mm (0.10" – 0.18")
|
5 mm (0.19")
|
25 mm (0.98")
|
|
60 x 120 mm (2.36" x 4.72")
|
2.5 – 4.5 mm (0.10" – 0.18")
|
5 mm (0.19")
|
25 mm (0.98")
|
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