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
Where a tube plug pushes inside the leg, this cap slides over the outside to finish and seal a square tube end. The friction-fit PE interior holds it on lightweight furniture, shelving, and display fixtures with 16 × 16 or 25 × 25 mm legs. Black 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 ↓
Square tube plugs press inside the tube. Square end caps slide over the outside. When you need to finish a square tube or solid bar end and there is no hollow interior to press into, or when you want external coverage that wraps around the tube end instead of sitting flush inside it, these plugs are the answer. The cap slides over the outside of the square tube or bar, grips through friction, and creates a clean, finished endpoint. External coverage for square profiles that plugs cannot reach or where an outer shell is the preferred approach.
PE construction with a friction-fit interior that grips all four outer walls of the tube or bar. Square end caps are external square tube caps for 16 × 16 and 25 × 25 mm square tubing and solid bar stock. End caps for square tube legs on lightweight furniture, wire shelving, display fixtures, racks, and any application with small to mid-size square profiles. Black and white.
One measurement: the outside dimension of the square tube or bar. Square end caps slide over the outside, so the outside dimension is all that matters. Wall thickness is irrelevant because the cap does not enter the tube interior. This makes these plugs simpler to size than internal tube plugs.
Use calipers or a ruler across one side of the square tube or bar, outside edge to outside edge. Confirm both sides are equal. Square end caps are available for 16 × 16 and 25 × 25 mm.
The cap adds to the outer profile at the endpoint (22 × 22 mm on the 16 × 16 cap, 28 × 28 mm on the 25 × 25 cap). Confirm this wider dimension does not interfere with adjacent legs, brackets, or stacking geometry.
The 16 × 16 cap inserts 16 mm. The 25 × 25 cap inserts 26 mm. The tube or bar must extend at least that far beyond any obstruction for the cap to seat fully.
Push on with corner alignment. Square end caps must slide onto the tube with corners aligned to corners, the same way square tube plugs require corner alignment during insertion. Once aligned, the cap slides down and grips through friction along the full insertion depth.
The same problems as square tube plugs, but from the outside. The National Wood Flooring Association (NWFA) recommends protective measures on all furniture legs, and these plugs provide that protection on small to mid-size square tubes and bars where internal plugs are impractical or where external coverage is preferred.
An open square tube end exposes the hollow interior, any internal rust, weld marks, or manufacturing residue. A bare square bar end looks industrial and unfinished. Square end caps cover both with a smooth PE shell that signals a complete, intentional design. The cap wraps around all four outer faces, hiding the raw tube or bar end completely. Push-on square leg caps that finish the look without any tools.
A bare square tube puts four sharp metal edges and four sharp corners on the floor. These plugs replace that contact with a smooth PE cap that distributes weight across a broader area (22 × 22 mm for the 16 × 16 cap, 28 × 28 mm for the 25 × 25 cap). The broader base compared to the bare tube means less pressure per square millimeter. Unlike leaving metal edges unprotected, the PE cap prevents scratching. For dedicated PA6 scratch protection, apply a square self-adhesive furniture pad to the cap base.
Exposed square tube and bar ends have four sharp corners that concentrate impact risk. On shelving at knee height, on furniture frames at hand level, and on display fixtures in public spaces, an uncapped square end is a cut and puncture hazard. Square end caps cover all four corners with rounded PE edges. In retail environments, schools, healthcare facilities, and homes with children, capping every exposed square end is basic safety practice. These are the square tube end caps PE external coverage that safety-conscious environments require.
On hollow square tubing, these plugs cover the open end from the outside and prevent moisture, debris, and insects from entering. The cap wraps around the tube rather than sealing from inside like a plug. On steel tubing, this external coverage still protects against internal corrosion. On solid bars, moisture sealing is not relevant, but the finished appearance and safety benefits still apply.
The fundamental choice: external or internal. Here is how square end caps compare to square tube plugs and other options.
Square tube plugs press inside the tube with ribbed walls. They sit flush and are invisible from the side. Square end caps slide over the outside and are visible. Tube plugs do not change the outer profile. The caps add 6 mm (16 × 16) or 3 mm (25 × 25) per side to the endpoint footprint. Choose tube plugs for a flush finish on larger hollow tubing. Choose these plugs for small profiles, solid bars, or when external coverage is preferred.
Generic square rubber tips are difficult to find in precise sizes. They stretch, deform, and fall off. Square end caps are precision-molded for 16 × 16 and 25 × 25 mm with a specific friction fit engineered for long-term retention. The PE does not stretch out, crack, or degrade with UV exposure or cleaning chemicals.
Welding a steel plate over the square tube end provides a sealed end but requires welding equipment, grinding, and refinishing. It is not removable. Square end caps push on by hand in seconds, are removable and replaceable, and cost a fraction of welding labor.
Round end caps fit round tubes and rods. These plugs fit square tubes and bars. Always match the cap shape to the tube shape. A round cap will not grip a square profile and a square cap will not grip a round profile.
When used on floor-contact legs, the PE base of the cap contacts the floor directly. PE is smoother and softer than bare metal, making it adequate for basic floor protection on most surfaces. The PE base works on hardwood, laminate, vinyl, tile, polished concrete, and cork without scratching under normal use. However, PE is harder than PA6 fiber. On scratch-sensitive floors like engineered hardwood or luxury vinyl, apply a square self-adhesive furniture pad to the cap base for dedicated PA6 protection.
On rough hard surfaces like textured tile, stamped concrete, or slate, the PE base may catch on surface irregularities. For those floors, furniture slides with ABS surfaces handle the texture better. On carpet, the caps provide adequate contact without any additional treatment. The broader cap footprint (22 × 22 mm or 28 × 28 mm) compared to the bare tube dimension means the caps distribute weight across a larger area than the bare tube alone, which reduces floor pressure regardless of floor type.
Square end caps are designed for small to mid-size square tubes and bars that need a finished, safe, protected endpoint. The external fit means they work on both hollow and solid profiles.
Two mounting methods for the same goal: finishing, sealing, and protecting square tube ends.
Press inside the tube. Flush, invisible from the side. Requires hollow tube. 13 × 13 to 100 × 100 mm. Black, grey, white.
Slide over the outside. Visible from the side. Works on hollow and solid. 16 × 16 and 25 × 25 mm. Black and white.
| Fits Tube (W) | Width (W1) | Fits Tube (L) | Length (L1) | Insert Depth (H) |
|---|---|---|---|---|
| 22 mm (0.87″) | 16 mm (0.63″) | 22 mm (0.87″) | 16 mm (0.63″) | 16 mm (0.63″) |
| 28 mm (1.10″) | 25 mm (0.98″) | 28 mm (1.10″) | 25 mm (0.98″) | 26 mm (1.02″) |
Tube wall thickness is a fit requirement, not a tolerance.
| Specification | Detail |
|---|---|
| Material | Polyethylene, a tough low-friction plastic |
| Sizes | 2 sizes |
| Width (W) | 22 to 28 mm (0.87″ to 1.10″) |
| Width 1 (W1) | 16 to 25 mm (0.63″ to 0.98″) |
| Length (L) | 22 to 28 mm (0.87″ to 1.10″) |
| Length 1 (L1) | 16 to 25 mm (0.63″ to 0.98″) |
| Height (H) | 16 to 26 mm (0.63″ to 1.02″) |
| Head height (H1) | 3 mm (0.12″) |
| Mounting | Pushes into the tube, held by ribs |
| Colors | Black, White |
| Floor compatibility | Hollow tube legs |
| Minimum order | Sold in a minimum of 4, then any quantity you need |
Square end caps slide over the outside of the tube. Square tube plugs press inside the tube. End caps are visible from the side and add to the outer dimension (22 × 22 mm for the 16 × 16 cap, 28 × 28 mm for the 25 × 25 cap). Tube plugs sit flush and are invisible from the side. Choose based on appearance preference and whether the tube interior is accessible.
Yes. Because square end caps slide over the outside, they work on both hollow tubes and solid bars. The cap grips the outer surface regardless of whether the profile is hollow or solid. This is a key advantage over tube plugs, which require a hollow interior.
Friction fit. The cap’s inner dimension is slightly smaller than the tube’s outer dimension, so it grips the outside walls. The insertion depth (16 mm for the 16 × 16 cap, 26 mm for the 25 × 25 cap) provides substantial contact area. For additional security on high-traffic furniture, a small drop of adhesive inside the cap provides a bond.
The 16 × 16 mm size comes in black and white. The 25 × 25 mm size is currently black only. For white or custom colors in the 25 × 25 mm size, contact Business Solutions. Custom color runs are possible with minimum order quantities.
Yes. The cap creates a PE floor-contact surface broader than the tube itself (22 × 22 mm contact area for a 16 × 16 mm tube). For additional scratch protection on smooth, hard floors, apply a square self-adhesive furniture pad to the cap base.
Square End Caps
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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