Hospitality-grade floor protection · Sizing help before you order · Apply for a business account
Sizing help · Apply for a business account
Hospitality-grade floor protection · Sizing help before you order · Apply for a business account
Sizing help · Apply for a business account
A D-shaped leg, flat on one side and curved on the other, won’t take a round, square, or oval plug. This one matches that half-oval profile, its flexible PE walls gripping both the flat and the curved interior. For hollow half-oval furniture legs. Black.
We make this size in production runs, so there is none on the shelf today. Tell us how many you would want and you go on the list for it. When enough people ask for a size, we run it, and the people who asked hear about it first.
We stock a limited range of tube sizes and wall thicknesses. Tell us the size you need and we will confirm availability and pricing by email.
Buying in volume? See business pricing & samples ↓
Round plugs fit round tubes. Square plugs fit square tubes. But furniture that uses D-shaped tubing needs a plug that matches a profile with one flat side and one curved side. Half-oval tube plugs are that match. The plug body mirrors the half-oval cross-section exactly: flat where the tube is flat, curved where the tube is curved. One plug seals the tube end, protects the floor, dampens noise, and gives the D-shaped leg a clean, finished appearance that no other plug shape can provide.
PE (polyethylene) construction with flexible internal walls that grip both the flat and curved interior surfaces simultaneously. Half-oval tube plugs are D-shaped tube plugs for furniture with half-oval tubing. Press-fit installation with no adhesive, no screws, and no tools beyond an optional rubber mallet. : 20 × 40, 30 × 40, and 30 × 60 mm. Wall thickness 1 to 2 mm. Black.
Three measurements: width (flat side), depth (flat side to curve peak), and wall thickness. The D-shaped cross-section means these two dimensions are measured differently than on symmetrical tubes. The width is straight across the flat side. The depth is perpendicular from the flat side to the highest point of the curve.
Use calipers or a ruler across the flat side of the D-shape, outside edge to outside edge. This is the first number in the size designation (20 or 30 mm for half-oval tube plugs).
Measure from the flat side to the peak of the curved side, outside edge to outside edge. This is the second number (40 or 60 mm). On a 30 × 60 mm half-oval, the flat side is 30 mm wide and the curve extends 60 mm from the flat side.
Use calipers at the tube end. All require 1 to 2 mm wall. Check both the flat wall and the curved wall, as manufacturing tolerances can create slight differences between the two.
Same press-fit concept as all our tube plugs, with orientation alignment. The flat side of the plug must match the flat side of the tube. Half-oval tube plugs only fit one way. If the plug does not slide in, rotate it 180° so the flat and curved sides align correctly.
The same four problems as every other tube plug, applied to a cross-section that no other plug shape can handle. The National Wood Flooring Association (NWFA) recommends protective measures on all furniture legs, and these plugs provide that protection on D-shaped hollow metal profiles.
An open half-oval tube end puts a sharp metal edge on the floor that combines a straight line (the flat side) with a curve (the rounded side). This mixed geometry creates uneven floor contact that no round, square, or rectangular plug can address. Half-oval tube plugs cover the entire D-shaped opening with a smooth PE head that distributes weight across the full asymmetric area. Unlike leaving metal edges unprotected, the plug eliminates the damage at the source.
An open D-shaped tube collects moisture, debris, and insects just like any other open tube. On steel tubing, trapped moisture causes internal corrosion. Half-oval tube plugs seal the entire asymmetric opening. The flexible walls grip both the flat and curved interior surfaces for a complete seal. No gaps at the flat-to-curve transition. Half-oval tube end plugs that seal the full cross-section.
Hollow D-shaped tubes resonate just like any other hollow profile. The mixed geometry can actually amplify certain frequencies because the flat and curved walls vibrate at different rates. Half-oval tube plugs fill the opening with PE, absorbing the vibration from both the flat and curved surfaces. D-shape furniture leg plugs that silence the rattle.
D-shaped tubing is a deliberate design choice. The flat side mounts flush while the curved side creates a rounded visual. An open tube end undermines that design intention by exposing the hollow interior. Half-oval tube plugs cover the opening with a clean PE head that maintains the D-shaped profile’s design language. The plug head mirrors the tube cross-section so the finished end reads as intentional. These are the half-oval plugs for furniture legs where the D-shaped profile is a visible design element that deserves a finished endpoint.
If your furniture has D-shaped tubing, only half-oval tube plugs fit correctly. Here is why other shapes do not work and when to use them instead.
Rectangular tube plugs have four flat sides. A half-oval tube has one flat side and one curved side. The rectangular plug cannot conform to the curved wall, leaving a gap along the entire curved surface. No seal, no grip on the curved side, no floor protection at the curve.
Oval tube plugs have two curved sides. A half-oval tube has one flat side. The oval plug will gap at the flat wall because it expects a curve where the tube is straight. If your tube has curves on both sides, it is oval, not half-oval. Use oval plugs for oval tubes and these plugs for D-shaped tubes.
Round tube plugs are circular and cannot fit a D-shaped opening. The flat side of the half-oval tube would prevent a round plug from entering at all. Shape must match shape.
An open D-shaped tube end exposes sharp metal edges along both the flat and curved portions. The mixed geometry creates an especially awkward visual because the tube is neither fully round nor fully rectangular. Half-oval tube plugs finish the end cleanly, matching the profile exactly.
When D-shaped tube ends contact the floor, the PE head of half-oval tube plugs provides basic floor protection. PE is smoother and softer than bare metal, adequate for most surfaces. The PE base works on hardwood, laminate, vinyl, tile, polished concrete, and cork without scratching under normal use.
On scratch-sensitive floors like engineered hardwood or luxury vinyl, apply a round self-adhesive furniture pad or rectangular self-adhesive furniture pad to the plug head for dedicated PA6 protection. Choose the pad shape that best covers the D-shaped head. On rough hard surfaces like textured tile or stamped concrete, furniture slides with ABS surfaces handle the texture better than PE.
Most half-oval tubing appears on chair backs and armrests rather than floor-contact legs. When the D-shaped tube does contact the floor, the flat side typically faces the mounting surface (upward) and the curved side faces the floor (downward), creating a curved floor-contact profile. The PE head smooths this contact into a consistent, scratch-free surface.
Half-oval tube plugs are designed for any hollow D-shaped furniture tube that needs a finished, sealed, protected endpoint. The D-shape is a specialized profile found in specific furniture designs where a flat mounting surface and a curved visual surface are needed in the same tube.
Match the plug shape to your tube shape. Every shape uses the same PE construction and press-fit concept.
D-shaped. One flat side, one curved side. Black.
| Fits Tube (W) | Fits Tube (L) | Insert Depth (H) |
|---|---|---|
| 20 mm (0.79″) | 40 mm (1.57″) | 14 mm (0.55″) |
| 30 mm (1.18″) | 40 mm (1.57″) | 14 mm (0.55″) |
| 30 mm (1.18″) | 60 mm (2.36″) | 16 mm (0.63″) |
Tube wall thickness is a fit requirement, not a tolerance.
| Specification | Detail |
|---|---|
| Material | Polyethylene, a tough low-friction plastic |
| Sizes | 3 sizes |
| Width (W) | 20 to 30 mm (0.79″ to 1.18″) |
| Length (L) | 40 to 60 mm (1.57″ to 2.36″) |
| Height (H) | 14 to 16 mm (0.55″ to 0.63″) |
| Head height (H1) | 5 mm (0.20″) |
| Tube wall thickness (T) | 1 to 2 mm (0.04″ to 0.08″) |
| Mounting | Pushes into the tube, held by ribs |
| Colors | Black |
| Floor compatibility | Hollow tube legs |
| Minimum order | Sold in a minimum of 4, then any quantity you need |
A half-oval tube has a D-shaped cross-section: one side is flat (like a rectangle) and the opposite side is curved (like an oval). It is the shape you get when you cut an oval tube in half lengthwise along the long axis. Half-oval tube plugs match this asymmetric profile precisely. No other plug shape fits correctly.
No. A rectangular plug has four flat sides. A half-oval tube has one flat side and one curved side. The rectangular plug will not conform to the curve, leaving gaps along the curved wall and a loose, unsealed fit. Use the correct half-oval tube plug for a proper seal and grip.
Match the flat side of the plug to the flat side of the tube, and the curved side of the plug to the curved side of the tube. The plug only fits one way. If it does not slide in, you likely have the flat and curved sides reversed. Rotate 180° and try again.
The in the current range are available in black only. For grey, white, or custom colors, contact Business Solutions with your size requirements and minimum order quantities.
Half-oval tubing appears on chair backs, armrests, and structural members where the flat side mounts flush against another surface (a seat pan, a backrest, a frame member) while the curved side faces outward for a rounded appearance. The D-shape provides a flat mounting surface and a rounded visual profile in one tube.
Half-Oval Tube Plugs
Outfitting a hotel, restaurant, school, healthcare facility, or large furniture build? Superior Glide supports volume orders with bulk pricing tiers, free physical samples, and dedicated quote pricing for accounts placing larger orders.
Bulk pricing tiers, net terms for qualified buyers, and dedicated support for facility managers and procurement teams.
Hold the product, test the fit, check the finish. We ship samples free so you can evaluate before committing to a full order.
For orders above standard volume tiers, we’ll prepare a custom quote with consolidated shipping and your account’s tier pricing.
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