Smooth fit rectangular tube plugs are designed for wide rectangular tubing where standard ribbed plugs may not seat evenly. PA (polyamide) construction provides a flush, precise insertion body that slides into wide profiles without the binding or gapping that PE ribs can cause on high-aspect-ratio tubes. 4 sizes: 15 × 80, 20 × 80, 20 × 100, and 25 × 100 mm. Wall thickness 1 to 2 mm (15 × 80 is 1.5 to 2 mm). PA rectangular tube plugs for wide commercial furniture bases, display fixtures, and industrial frames. Black, grey, and white. Sold in multiples of 4.
Not sure what size? See the size chart ↓
📦 Sold in packs of 4 — quantity adjustable at checkout
Standard rectangular tube plugs use PE ribs that compress during insertion. That works perfectly on most sizes. But on wide, shallow rectangular tubing (80 to 100 mm on the long side), the aspect ratio creates a problem: ribs that compress evenly on a 30 × 50 mm tube do not compress evenly on a 20 × 100 mm tube. The wide wall flexes differently than the narrow wall, leading to gaps, binding, or uneven seating. Smooth fit rectangular tube plugs solve this with a different material and a different insertion geometry.
PA (polyamide) construction instead of PE. A flush, precise insertion body instead of flexible ribs. The PA body slides into wide profiles with even contact across the entire cross-section. Smooth fit rectangular tube plugs are PA rectangular tube plugs engineered for the 4 specific wide-profile sizes that standard ribbed plugs cannot handle cleanly: 15 × 80, 20 × 80, 20 × 100, and 25 × 100 mm. Black, grey, and white. Sold in multiples of 4.
Smooth fit rectangular tube plugs are available in 4 sizes, all featuring the wide aspect ratio that defines this product. The right smooth fit plug matches your tube’s width, length, and wall thickness.
Wall: 1.5 to 2 mm. The narrowest width with 80 mm length. For slim, wide structural members. Black only.
Wall: 1 to 2 mm. Standard width for commercial table bases and fixture frames. The most popular smooth fit size. Black, grey, and white.
Wall: 1 to 2 mm. Extra-wide profile for heavy-duty table bases and industrial frames. Black and grey.
Wall: 1 to 2 mm. The widest and deepest smooth fit profile. For the heaviest commercial and industrial structural members. Black and grey.
For standard rectangular profiles up to 60 × 120 mm that do not require smooth fit, use rectangular tube plugs (32 sizes, PE with ribs). For square profiles, use square tube plugs. For custom smooth fit sizes, contact Business Solutions.
Same three measurements as standard rectangular tube plugs: width (short side), length (long side), and wall thickness. Smooth fit rectangular tube plugs require one of the 4 specific size and wall combinations listed above. If your tube does not match, check standard rectangular tube plugs for a compatible size.
Use calipers or a ruler across each side of the rectangular tube, outside edge to outside edge. Record the short side (width) and the long side (length). Smooth fit rectangular tube plugs are available for widths of 15, 20, and 25 mm with lengths of 80 and 100 mm.
Use calipers at the tube end. Most smooth fit sizes require 1 to 2 mm wall. The 15 × 80 size requires 1.5 to 2 mm. The smooth PA body needs precise dimensional contact, so wall thickness accuracy matters more than with standard ribbed plugs.
Width, length, and wall thickness must all match. The smooth fit body has tighter dimensional tolerances than ribbed PE plugs because it relies on surface contact rather than rib compression for its grip.
Simpler than ribbed plugs. The smooth PA body slides into the tube with even contact across all surfaces. No ribs to compress means less insertion resistance and more even seating. Orientation still matters: match width to width and length to length.
The specific problem of wide-aspect-ratio rectangular tubing that standard ribbed plugs cannot handle evenly. The National Wood Flooring Association (NWFA) recommends protective measures on all furniture legs, and smooth fit rectangular tube plugs provide that protection on the wide structural tubing that standard plugs miss.
The primary advantage. On a 20 × 100 mm tube, the long wall is 5 times wider than the short wall. Standard PE ribs compress differently on each wall, creating uneven seating: the plug may gap on the long wall while binding on the short wall, or vice versa. Smooth fit rectangular tube plugs eliminate this problem with a flush PA body that contacts all four walls evenly. Wide profile tube plugs that seat correctly the first time. Rectangular tube plugs wide enough for commercial and industrial structural members.
Wide rectangular tubing is often used for table bases and fixture frames where the tube end contacts the floor with a broad footprint. The smooth PA head covers the full rectangular cross-section. Unlike leaving metal edges unprotected, the PA surface prevents scratching. PA has a lower coefficient of friction than PE, so smooth fit plugs actually glide more quietly on hard floors. For additional scratch protection, apply a rectangular self-adhesive furniture pad to the plug head.
Same complete seal as ribbed plugs. The smooth PA body fills the tube opening and prevents moisture, debris, dust, and insects from entering. On wide structural tubing that sits at floor level, the large tube opening is especially vulnerable to water, cleaning solution runoff, and tracked-in debris. Smooth fit rectangular tube plugs seal the full opening.
PA (polyamide) brings properties that PE does not. Higher tensile strength: the body maintains shape across the full 80 to 100 mm width without flexing. Better chemical resistance: tolerates industrial cleaning agents, solvents, and commercial kitchen chemicals. Wider temperature range: stable from -40 °C to 85 °C compared to PE’s -25 °C to 65 °C. Lower friction coefficient: smoother floor contact. These are the smooth fit plugs for furniture and fixtures in demanding commercial and industrial environments.
PA (polyamide) throughout. This is the key difference from every other tube plug in the range, which uses PE. Smooth fit rectangular tube plugs are molded from a single piece of PA with no joints, seams, or separate components.
The entire plug, head and body, is PA. The body slides into the tube with a flush profile that relies on precise dimensional contact rather than rib compression. PA provides the rigidity needed to maintain shape across wide profiles without flexing during insertion or under load.
Instead of flexible ribs, smooth fit rectangular tube plugs use a precisely dimensioned body that grips through surface contact. The PA body is machined to tight tolerances so it slides in with consistent friction across all four walls. On wide profiles, this even contact is what makes the difference: every square millimeter of the body contributes to the grip rather than relying on discrete rib points.
If your furniture has wide rectangular tubing in the 80 to 100 mm length range, here is how smooth fit rectangular tube plugs compare to the alternatives.
Standard rectangular tube plugs use PE with flexible ribs. On profiles up to about 60 × 120 mm, they work well. On wide, shallow profiles like 20 × 100 mm, the ribs compress unevenly. Smooth fit rectangular tube plugs solve this with PA and flush geometry. Use standard ribbed for most rectangular sizes. Use smooth fit for the 4 specific wide-profile sizes.
Rectangular tube plugs with pad have integrated PA6 floor protection but are available in different sizes (13.8 × 27.5 and 20 × 30 mm). No overlap with smooth fit sizes. The two products serve different tube dimensions.
An open 20 × 100 mm tube presents 240 mm of exposed sharp metal edge at the tube end. That is more than twice the exposed edge of a typical chair leg tube. Smooth fit rectangular tube plugs seal the entire opening with a single press-fit plug.
Welding a plate over a wide tube end is more common at these sizes than on smaller tubes, but it requires equipment, refinishing, and is not removable. Smooth fit rectangular tube plugs push in by hand, are removable, and preserve the tube finish.
Smooth fit rectangular tube plugs are designed exclusively for wide rectangular tubing where standard ribbed plugs cannot seat evenly. The 4 available sizes cover the most common wide-profile specifications in commercial and industrial furniture.
Match the plug shape to your tube shape. Every shape uses the same press-fit concept with material and geometry optimized for the profile.
4 wide-profile sizes, 80 to 100 mm. PA.
Anywhere wide rectangular tubing has open ends that need finishing, sealing, and floor protection with even seating across the full profile width.
Conference tables, training tables, dining tables, and desks with wide rectangular tube bases. The 20 × 80 and 20 × 100 mm sizes cover the most common commercial table base tubing. Smooth fit rectangular tube plugs seal and finish these wide profiles cleanly where ribbed plugs would gap. Available in bulk for manufacturing runs and facility fit-outs. For commercial pricing, visit Business Solutions.
Heavy-duty workbenches, industrial equipment frames, retail fixture bases, and architectural structural elements. The 25 × 100 mm size handles the heaviest wide-profile tubing. In industrial environments, the PA material’s superior chemical resistance and wider temperature range make smooth fit plugs more durable than PE alternatives. For floor-contact bases that also need PA6 scratch protection, pair with rectangular self-adhesive furniture pads. For rough hard floors like textured tile or stamped concrete, furniture slides with ABS surfaces handle the texture better than PA or PE on floor contact. In environments where the furniture must stay in place rather than slide, consider adding anti-slip pads to the plug base after installation.
Smooth fit rectangular tube plugs require minimal maintenance. PA is more durable than PE under chemical exposure and temperature variation, so these plugs outlast standard PE plugs in demanding environments. Check periodically that the plug remains seated flush with the tube edge. The smooth body is less likely to work loose under vibration than ribbed plugs because the grip is distributed across the full surface rather than concentrated at rib points. On wide profiles, the large contact area provides a stable, even hold that resists both pull-out and rocking forces.
On commercial furniture that gets moved frequently, inspect every 6 months. On static industrial equipment and fixtures, an annual check is enough. The PA surface does not stain, discolor, or absorb cleaning products or industrial solvents. In commercial kitchens, laboratories, and manufacturing facilities where aggressive cleaning chemicals are used daily, PA holds up where PE would degrade over time. These plugs are sold in multiples of 4, so keeping spares on hand is practical for commercial and industrial environments. If a plug becomes damaged or no longer seats securely, replace it with a new smooth fit plug. The PA body does not crack like PE under repeated stress; instead it maintains its shape until the dimensional tolerance loosens enough to affect grip.
Rectangular Tube Plugs: PE with ribs, 32 sizes from 10 × 30 to 60 × 120 mm. For all rectangular sizes outside the smooth fit range.
Rectangular Self-Adhesive Furniture Pads: PA6 for scratch protection on hard floors. Apply to the plug head or along the tube base.
Rectangular Self-Adhesive Furniture Glides: PA6 on ABS platform for glide performance.
| Specification | Details |
|---|---|
Product Type |
Tube Plugs – Inner (Type 2) |
Shape |
Rectangular Tube |
Materials |
PA (Polyamide) |
Fit Style |
Smooth, rib-free compression fit |
Floor Compatibility |
All hard and soft flooring |
Furniture Compatibility |
Chairs, benches, industrial frames, carts, trolleys, storage systems |
Leg Compatibility |
Metal and plastic rectangular tubing |
Sizes Available |
15 × 80 mm to 25 ×100 mm, fits 1–2 mm wall thickness |
Color Options |
Black, Grey, White |
Installation Type |
Press-fit by hand or rubber mallet |
Key Benefits |
Flush finish, chemical resistance, impact resistance, fast install |
Indoor/Outdoor Use |
Indoor | Covered Outdoor | Uncovered Outdoor |
Recyclable |
Yes |
| Tube Dimensions (L x W) | Tube Wall Thickness (T) | Head Height (H1) | Insert Depth (H) |
|---|---|---|---|
15 x 80 mm (0.59" x 3.15") |
1.5 – 2 mm (0.06" – 0.08") |
5 mm (0.19") |
14 mm (0.55") |
20 x 80 mm (0.79" x 3.15") |
1 – 2 mm (0.04" – 0.08") |
5 mm (0.19") |
14 mm (0.55") |
20 x 100 mm (0.79" x 3.94") |
1 – 2 mm (0.04" – 0.08") |
5 mm (0.19") |
14 mm (0.55") |
25 x 100 mm (0.98" x 3.94") |
1 – 2 mm (0.04" – 0.08") |
5 mm (0.19") |
14 mm (0.55") |
Standard rectangular tube plugs use PE with flexible ribbed walls that compress during insertion. Smooth fit rectangular tube plugs use PA (polyamide) with a flush-profile body engineered for wide tubes. On profiles 80 to 100 mm long, standard ribs may not compress evenly across the full width, leading to gaps on one axis or binding on the other. The smooth PA body provides more even seating across the entire cross-section.
The hold mechanism is different. Smooth fit rectangular tube plugs rely on precise dimensional matching between the PA body and the tube interior rather than rib compression. The fit is firm and sufficient for all standard furniture applications. For environments with extreme vibration or pull-out force, standard ribbed plugs in a matching size would provide stronger retention.
PA (polyamide) has higher tensile strength and rigidity than PE. On wide profiles, the body needs to maintain its shape across 80 to 100 mm without flexing or warping during insertion. PA holds its geometry. PE would flex too much at these widths. PA also handles a wider temperature range and has better chemical resistance than PE.
Standard rectangular tube plugs are available up to 60 × 120 mm, but none cover the specific 15 × 80, 20 × 80, 20 × 100, or 25 × 100 dimensions. These sizes are only available as smooth fit. Even if a close standard size existed, the wide aspect ratio would make ribbed insertion uneven.
Commercial table bases, conference table frames, heavy-duty display fixtures, industrial workbenches, retail shelving supports, and architectural structural elements. The wide, shallow profile distributes load across a broad footprint. These are not typical chair legs. They are structural members on larger, heavier furniture and fixtures.
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