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
For an exposed tube end where you want the finish to stand out, a flat plug is too plain. This one rises into a full half-sphere, the most pronounced decorative head in the range. The ribbed PE body press-fits like any flat plug. Black, grey, and white.
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 ↓
Flat heads are invisible. Domed heads are subtle. The half-sphere is deliberate. Half-sphere head round tube plugs give hollow round furniture legs a bold, fully rounded decorative finish that turns an exposed tube end into an unmistakable design feature. The hemisphere extends above the tube edge as a smooth, symmetrical dome, creating the most pronounced decorative profile in the range. On chair backs, armrest ends, exposed frame tops, and display fixtures, the half-sphere communicates that every detail was considered.
Same PE construction and flexible ribbed body as the flat head range. Same press-fit installation. The only difference is the head: a full hemisphere instead of a flat disc. Half-sphere head round tube plugs are hemisphere decorative tube plugs for furniture where maximum visual impact on exposed tube ends is the goal. from Ø 16 mm to Ø 30 mm. Wall thickness 1 to 1.5 mm (Ø 16 also available in 1.5 to 2 mm). Black, grey, and white.
Same two-measurement process as all tube plugs: outside diameter (OD) and wall thickness. Half-sphere head round tube plugs are available in Ø 16, 20, 22, 25, and 30 mm, all with 1 to 1.5 mm wall thickness (Ø 16 also available in 1.5 to 2 mm). If your tube does not match these specifications, check the other head styles for a compatible size.
Use calipers or a ruler across the widest point of the tube opening. Outside edge to outside edge. Match to one of the 5 available diameters for these plugs.
Use calipers at the tube end, or calculate: (OD minus ID) / 2. Most sizes require 1 to 1.5 mm wall. Ø 16 mm is also available in 1.5 to 2 mm for thicker-walled tubing.
Both OD and wall thickness must fall within the listed range. A half-sphere head round tube plug sized for Ø 25 mm / 1 to 1.5 mm wall will not grip properly in a Ø 25 mm tube with 2.5 mm walls.
Same press-fit installation as all our tube plugs. The half-sphere head does not change the process. At 1 to 1.5 mm wall thickness, most sizes press in by hand. A rubber mallet provides extra seating force on snug fits. Half-sphere head round tube plugs install in seconds per tube end.
Every benefit of a standard tube plug, plus the boldest decorative profile in the range. The National Wood Flooring Association (NWFA) recommends protective measures on all furniture legs, and these plugs contribute by sealing the tube end even on non-floor-contact applications.
The primary reason to choose half-sphere over any other head style. The full hemisphere protrudes above the tube edge as a smooth, symmetrical ball shape that catches light and draws the eye. On retail fixtures, restaurant seating, hospitality furniture, showroom displays, and exhibition frames, visible tube ends finished with these plugs communicate careful attention to detail. These are the decorative round tube plugs with a hemisphere profile bold enough for the most design-conscious environments. Available in black, grey, and white to match or contrast with the frame finish. The decorative round tube plugs hemisphere profile that design-forward environments demand.
Same sealed end as flat head plugs. The hemisphere does not affect the seal. Moisture, debris, and insects are kept out of the tube interior. On steel tubing, this prevents the internal corrosion that weakens the structure from the inside out. Half-sphere head round tube plugs protect the tube interior regardless of orientation. Unlike leaving furniture hardware unprotected, sealed ends extend the life of the frame.
Same resonance reduction as flat head plugs. The PE body fills the tube opening and absorbs the vibration that hollow, open tubes amplify. In environments with many metal-framed chairs, every sealed tube end reduces the cumulative metallic noise. Half-sphere head round tube plugs provide the same acoustic benefit as flat head plugs with the most impactful visual upgrade in the range.
The hemisphere concentrates floor contact at a single point. This causes instability, rocking, and floor marking under furniture weight. For floor-contact legs, use flat head round tube plugs that spread load evenly. For floor contact with dedicated scratch protection, use pad slot round tube plugs with a PA6 pad insert. Half-sphere tube end plugs are designed for the visible tube ends that do not touch the floor.
All head styles share the same PE body and ribbed grip. The choice comes down to appearance, floor contact needs, and how much decorative impact you want on the exposed tube end. Here is how these plugs compare to every other option.
Flat head round tube plugs sit flush with the tube end. No protrusion, no visual accent. Half-sphere head round tube plugs add the maximum protrusion and the boldest decorative effect. Choose flat for floor-contact legs and utilitarian applications. Choose half-sphere for the most visible, most design-critical tube ends on the furniture.
Domed head round tube plugs have a gentler, lower curve that rises modestly above the tube edge. The half-sphere is a full hemisphere that protrudes significantly more. If you want subtle, choose domed. If you want bold, choose half-sphere. Domed comes in Ø 16 and 26 mm. Half-sphere head round tube plugs come in from Ø 16 to 30 mm, giving you more options.
Conical head round tube plugs taper to a sharp geometric peak. Angular, modern, architectural. Half-sphere head round tube plugs are organic, smooth, symmetrical. The hemisphere and the cone are both bold statements, but in completely different visual languages. Conical is Ø 30 mm only. Half-sphere covers
Anti-slip TPE round tube plugs have a rubber head that grips the floor. Functional, not decorative. Half-sphere head round tube plugs are the most decorative, not functional on floors. On the same piece of furniture, you might use anti-slip on the floor-contact legs and half-sphere on the visible back uprights or armrest ends.
Pad slot round tube plugs have a recessed channel that accepts a PA6 pad for hard-floor scratch protection. Flat profile, functional design. Half-sphere head round tube plugs offer maximum decorative impact with no floor-contact function. For the same piece of furniture, pad slot plugs handle the floor-contact legs while half-sphere heads finish the visible, non-floor-contact ends.
Every variant uses the same internal ribbed PE body. The head determines appearance, floor contact capability, and specialized function.
Flush finish. Ø 10 to 80 mm. Best for floor contact and general use.
Full hemisphere. Ø 16 to 30 mm. Bold decorative effect. Black, grey, white.
| Fits Tube (Ø) | Head Height (H1) | Tube Wall Thickness (T) |
|---|---|---|
| 16 mm (0.63″) | 8 mm (0.31″) | 1 to 1.5 mm (0.04″ to 0.06″) |
| 16 mm (0.63″) | 8 mm (0.31″) | 1.5 to 2 mm (0.06″ to 0.08″) |
| 20 mm (0.79″) | 10 mm (0.39″) | 1 to 1.5 mm (0.04″ to 0.06″) |
| 22 mm (0.87″) | 11 mm (0.43″) | 1 to 1.5 mm (0.04″ to 0.06″) |
| 25 mm (0.98″) | 12.5 mm (0.49″) | 1 to 1.5 mm (0.04″ to 0.06″) |
| 30 mm (1.18″) | 16 mm (0.63″) | 1 to 1.5 mm (0.04″ to 0.06″) |
Tube wall thickness is a fit requirement, not a tolerance.
| Specification | Detail |
|---|---|
| Material | Polyethylene, a tough low-friction plastic |
| Sizes | 6 sizes |
| Diameter (Ø) | 16 to 30 mm (0.63″ to 1.18″) |
| Height (H) | 14 mm (0.55″) |
| Head height (H1) | 8 to 16 mm (0.31″ to 0.63″) |
| Tube wall thickness (T) | 1 to 2 mm (0.04″ to 0.08″) |
| Mounting | Pushes into the tube, held by ribs |
| Colors | Black, Gray, White |
| Floor compatibility | Hollow tube legs |
| Minimum order | Sold in a minimum of 4, then any quantity you need |
The half-sphere is the most dramatic of the three decorative profiles. It extends as a full hemisphere above the tube edge, creating a bold, ball-like endpoint. Domed head plugs have a gentler, lower curve. Conical head plugs taper to a sharp geometric peak. If you want subtle, choose domed. If you want angular, choose conical. If you want maximum decorative impact, choose half-sphere.
The half-sphere is the most popular decorative profile because its symmetrical hemisphere works on the widest range of furniture styles. Five diameters (Ø 16 to 30 mm) and three colors (black, grey, white) cover virtually every common chair back, armrest, and fixture tube end. Not all size and color combinations are available. Ø 25 mm has the full three-color range. Other sizes are limited to one or two colors.
No. The hemisphere concentrates floor contact at a single point instead of distributing weight across a flat surface. This causes instability and floor marking. For floor-contact legs, use flat head round tube plugs. For floor contact with scratch protection, use pad slot round tube plugs. Round tube plugs half-sphere head are designed exclusively for visible, non-floor-contact tube ends.
Yes, in most cases. The full hemisphere protrudes significantly above the tube edge. If furniture stacks by nesting tube ends, the half-sphere will prevent flush stacking. For stackable furniture, flat head plugs are the right choice. Use half-sphere on non-stacking furniture where the decorative profile is visible and valued.
Yes. This is the most common application. Use round tube plugs half-sphere head on chair back uprights, armrest ends, or exposed frame tops where the bold decorative profile is visible. Use flat head plugs on the floor-contact legs where load distribution matters. All head styles use the same PE body and ribbed grip.
Half-Sphere Head Round 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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