Tube plugs and end caps for hollow metal furniture legs. Three product types: inner plugs press inside the tube and grip the tube wall, external end caps slide over the outside, and threaded-insert plugs add a metal nut for adjustable leveling feet. Hundreds of sizes across round, square, rectangular, and specialty profiles. PE, PA, and TPE materials. No adhesive, no tools required.
Press-fit, no adhesive required·Inner plugs, end caps, and threaded inserts·Hundreds of sizes in stock
Tube plugs and end caps come in three different formats. The right product depends on how your tube is built and what you need it to do. Inner plugs grip from inside; end caps slide over the outside; threaded-insert plugs add a metal nut for leveling feet. The choice comes down to tube wall thickness, the look you need, and whether you need adjustable leveling feet.
INNER PLUGS
Ribbed body presses inside the tube; ribs compress and grip the tube wall mechanically. The standard solution for all hollow furniture legs with a wall thickness of 1 mm or greater.
END CAPS
Slide over the outside of the tube for a clean exterior cap appearance. The right choice when the tube wall is too thin for inner ribs to grip securely.
THREADED INSERTS
A PA body with a hot-dip galvanized iron (Fe HDG) threaded nut molded in. Press the plug into the tube, then thread in an adjustable leveling foot. The cleanest way to add leveling feet to tube-leg furniture.
Inner plugs are the most common form of tube plugs and end caps in the catalog. Match the plug shape to your tube profile. The plug outer dimension must equal the tube outer dimension; the wall-thickness range (T) must contain your measured tube wall. When in doubt between two T ranges, choose the tighter fit — a plug that grips firmly is better than one that fits loosely.
The most common profile for chair and table legs. Ribbed walls grip the inside of round hollow steel tubing used in dining chairs, barstools, cafe furniture, and hospitality seating. Multiple wall-thickness (T) options per size, covering thin-wall pressed tubing up to heavy-gauge structural round tube.
Also available: Ø 17.2, 27, 33.7, 35, 45, 48.3, 60.3, 63, 77 mm. Black, Grey, White.
For square-section steel legs common in dining chairs, stools, benches, and commercial tables. The four-sided ribbed body prevents rotation inside the tube. Multiple wall-thickness options for the most common sizes.
Also available: 18 × 18, 22 × 22, 70 × 70 mm. Black, Grey, White.
For sled-base frames, H-frame tables, bench frames, and any furniture leg with a rectangular tube cross-section. The most versatile group in the plug catalog: 40+ standard sizes from 10 × 30 mm to 60 × 120 mm. Versions with an integrated PA6 pad are available for select sizes.
Also available with integrated PA6 pad: Rectangular Tube Plugs with Pad. Smooth-fit versions without ribs: Smooth Fit Rectangular Tube Plugs. Plus 15 × 40, 15 × 80, 18 × 30, 20 × 25, 20 × 60, 20 × 80, 20 × 100, 25 × 35, 25 × 60, 25 × 100, 30 × 40, 30 × 70, 30 × 80, 30 × 100, 30 × 110, 40 × 50, 40 × 100, 50 × 70 mm. Black, Grey, White.
Designer and contemporary furniture often uses non-standard tube profiles. Oval and ellipse plugs cover round-edged rectangular tubes used in premium chair frames. Half-oval plugs fit the D-profile sections common in sled-base and cantilever frames. Angled plugs are used when the tube meets the floor at an angle. Anti-slip TPE plugs provide a non-slip rubber contact surface for legs that must stay in place.
Press the plug into the tube leg, then thread in an adjustable leveling foot. The PA body grips the tube wall; the hot-dip galvanized iron insert provides the threaded socket. No additional hardware needed. Stainless steel inserts available for outdoor and wet environments.
For thin-wall tubing where inner ribs cannot grip, or when a smooth exterior cap look is preferred. The external cap body slides over the tube end and rests against the outer surface. Also includes rubber feet with a pad for square legs that need floor protection built into the cap.
Fits Ø 10 mm and Ø 12 mm tube openings. Outer body diameter 15.5 mm. Height 35 mm. PE material. Black.
Available in 16 × 16 mm and 25 × 25 mm. PE material. Black and White. The 16 × 16 mm cap has an outer body of 22 × 22 mm. The 25 × 25 mm cap has an outer body of 28 × 28 mm.
WITH FLOOR PAD
A rubber external cap for square tube legs with a PA6 pad on the floor contact surface. Slides over the outside of the leg. No tools, no adhesive. The rubber body dampens vibration. The PA6 pad protects hard floors from scratching. 38 × 38 mm. Black. For square tube legs where the cap also serves as the primary floor contact.
All tube plugs and end caps fit by precise measurement. Two measurements determine the correct plug: the outer dimension of the tube and the wall thickness. Both must match the plug specification for a secure press fit.
| What to Measure | How to Measure | What It Determines |
|---|---|---|
| Outer Diameter (round) or L × W (square / rectangular) | Measure across the outside of the tube with calipers or a ruler. | The plug size. Must equal the tube outer dimension. |
| Wall Thickness (T) | Use calipers at the cut end of the tube. Measure the actual wall, not the manufacturer spec. | The T range. Your wall must fall within the plug’s listed T range. |
| Head Style (oval and ellipse) | Decide whether the cap should sit flush, slightly raised, or barely visible above the tube face. | Flat, rounded, or thin head variant. |
| Thread Size (threaded inserts) | Check the shank of the leveling foot you plan to use — not the tube. | M6, M8, M10, or M12 insert. |
Tip: when your measurement lands between two T ranges
Choose the tighter range. A plug that grips firmly is always better than one that fits loosely. A loose plug can fall out under vibration or when the furniture is moved.
Need measurement help? Read the full measurement guide →
Tube plugs and end caps use three materials across the range. Most plugs use PE for residential and light-commercial applications. PA is specified for higher loads, threaded inserts, and wider temperature ranges. TPE is available for applications that need rubber characteristics with full plastic recyclability.
STANDARD
Flexible, tough, water and chemical-resistant. Rated from −25°C to +65°C. The standard material for all ribbed inner plugs and external end caps. Suitable for recycling.
HIGH LOAD
Higher tensile and impact strength than PE. Resistant to acids and alkalis. Low friction coefficient. Rated from −40°C to +85°C. Required for threaded-insert plugs, angled plugs, and high-load applications.
SPECIALTY
Combines rubber characteristics with plastic processability. Excellent abrasion resistance. Rated from −51°C to +124°C. Available in 40–90 Shore A hardness. Used in anti-slip plug variants.
Tube plugs and end caps seal and finish the tube end. They are not designed as a primary floor-protection system for furniture that moves frequently. If your tube-leg furniture slides across hard floors, pair tube plugs with self-adhesive furniture glides or slides on the floor-contact points. For leveling, pair threaded-insert plugs with adjustable leveling feet.
Get the right plug before you order.
Selection Guide
Inner plug or end cap? PE, PA, or TPE? Threaded insert? Walks through every decision point with examples from common furniture types.
Measurement Guide
How to measure outer diameter, wall thickness, and head height for round, square, rectangular, and specialty tube profiles.
Installation Guide
Step-by-step press-fit installation, including how to remove and replace worn plugs without damaging the tube.
Browse other product categories: Furniture Glides · Furniture Slides · Furniture Pads · Adjustable Leveling Feet · Sled Base Glides
Other product guides: Glide Guide · Slide Guide · Pad Guide · Leveling Feet Guide · Sled Base Glides Guide
Business accounts: Business Solutions for volume pricing, B2B accounts, hospitality fit-outs, and commercial orders.
