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Tube Plugs & End Caps

Product Type

Shape

Size

Wall Thickness

Head Type

Feature

Thread Size

Color

Furniture Type

Floor Type

33864
  • 33864
  • 33863
  • 33865
  • 33866

Angled Round Tube Plugs

From $1.09

35457
  • 35457
  • 35456
  • 35458
  • 35459

Round End Caps

From $2.83

97054
  • 97054
  • 97053
  • 97055
  • 97056

Square Tube Plugs

From $0.30

97061
  • 97061
  • 97060
  • 97062
  • 97063

Square End Caps

From $1.56

97068
  • 97068
  • 97067
  • 97069
  • 97070

Rectangular Tube Plugs

From $0.37

97078
  • 97078
  • 97076
  • 97077
  • 97079

Smooth Fit Rectangular Tube Plugs

From $1.23

Tube Plugs & End Caps

Every hollow metal furniture leg ends with an open tube. Left bare, that edge sits directly on the floor, rocking on a sharp rim and scratching hard surfaces with every movement. Commercial-grade tube plugs and end caps seal the opening with a precision press fit, protect the floor, and give the leg a finished look. No adhesive. No tools. Just press in and done. Available in round, square, and rectangular profiles across dozens of sizes, with threaded-insert versions for furniture that needs adjustable leveling feet. External rubber feet with a PA6 pad for square legs that need floor protection at the cap. Sold in multiples of 4.

Inner Plugs vs. External End Caps

The right product depends on how your tube is built. Inner plugs press into the opening and grip the tube wall from inside. End caps slide over the outside of the tube. Both seal and protect. The choice comes down to tube wall thickness and the look you need.

END CAPS

External End Caps

Slide over the outside of the tube for a clean cap appearance. The right choice when the tube wall is too thin for inner ribs to grip securely, or when a flush exterior cap look is preferred. Wider base footprint than most inner plugs.

  • Round external: fits Ø 10 and Ø 12 mm tube openings
  • Square external: 16×16 mm and 25×25 mm
  • Square rubber feet with pad: 38×38 mm — rubber body, PA6 floor contact
  • PE material; Black and White
  • Protective cap for thin-wall tubing that cannot accept inner ribs
  • Also suitable for vertical tube tops to prevent dust entry
THREADED INSERTS

Plugs with Threaded Inserts

A PA body with a hot-dip galvanized iron (Fe HDG) threaded insert molded in. Press the plug into the tube leg, then thread in an adjustable leveling foot. Rated 60–150 kg static load per unit, depending on insert size. The cleanest way to add leveling feet to tube-leg furniture.

  • Available for Round, Square, and Rectangular tubes
  • Thread sizes: M6, M8, M10, M12
  • Stainless steel insert option for wet and outdoor environments
  • Static load capacity up to 150 kg/plug
  • Black, White, and Grey

Inner Tube Plugs by Shape

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.

Round Tube Plugs (Inner with Ribs)

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. Available in 26 diameters and multiple wall-thickness options per size, covering thin-wall pressed tubing up to heavy-gauge structural round tube. Standard height 12–14 mm for most sizes; 14 mm for diameters Ø 45 mm and above.

Round Tube Plugs

Ø 10 mm
T 1–1.5 mm and 1.5–2 mm — Thin tube chair frame spindles
Ø 13 mm
T 1–1.5 mm and 1.5–2 mm — Small frame tubing
Ø 16 mm
T 1–1.5 mm and 2–2.5 mm — Light side chairs
Ø 18 mm
T 1.5–2 mm — Standard dining chair legs
Ø 20 mm
T 1–1.5 mm, 1.5–2.5 mm — Dining chairs, cafe chairs
Ø 22 mm
T 1.5–2 mm, 2–2.5 mm, 2.5–3 mm — Dining and accent chairs
Ø 25 mm
T 1.5–2 mm — Standard commercial chair leg
Ø 28 mm
T 1–2 mm — Barstools, heavier dining frames
Ø 30 mm
T 1.5–2 mm — Tables, benches
Ø 32 mm
T 1.5–2 mm — Heavy-duty commercial seating
Ø 38 mm
T 1–2 mm — Table legs, pedestal bases
Ø 40 mm
T 1.5–2.5 mm — Commercial tables
Ø 42 mm
T 1–2 mm, 1.5–2.5 mm, 2.5–3.5 mm — Heavy chairs, tables
Ø 50 mm
T 1.5–2 mm, 3–4 mm — Dining and conference tables
Ø 60 mm
T 1.5–2.5 mm — Large-diameter table legs
Ø 70–80 mm
T 1.5–2 mm — Structural columns, heavy furniture bases

Also available: Ø 17.2, 27, 33.7, 35, 45, 48.3, 60.3, 63, 77 mm for specialized tube sizes. Black · Grey · White.

Square Tube Plugs (Inner with Ribs)

For square-section steel legs common in dining chairs, stools, benches, and commercial tables. The four-sided ribbed body prevents rotation inside the tube. Available in 16 sizes from 13×13 mm to 100×100 mm. Multiple wall-thickness options for the most common sizes.

Square Tube Plugs

13×13 mm
T 1–2 mm — Small square frame tubing
15×15 mm
T 1–2 mm — Light side chairs
16×16 mm
T 1–2 mm — Standard cafe chairs
20×20 mm
T 1–2 mm — Dining chairs, bar stools
25×25 mm
T 1–2 mm — Standard commercial chairs
30×30 mm
T 1–2 mm, 2–3 mm — Benches, heavy chairs
35×35 mm
T 1–2 mm — Tables, heavier furniture
40×40 mm
T 1–2 mm, 3–4 mm — Commercial tables, heavy furniture
45×45 mm
T 1–2 mm — Heavy hospitality seating
50×50 mm
T 1–2 mm, 2–3 mm, 3.5–5 mm — Conference tables
60×60 mm
T 1–2 mm — Large structural legs
80×80 mm
T 1–2 mm, 3–5 mm — Structural and architectural legs
100×100 mm
T 2–3 mm — Heavy structural columns

Also available: 18×18 mm, 22×22 mm, 70×70 mm. Black · Grey · White.

Rectangular Tube Plugs (Inner with Ribs)

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. Plugs with an integrated PA6 pad are available for select sizes where the plug doubles as the floor contact point.

Rectangular Tube Plugs

10×30 mm
T 1–2 mm — Thin sled and H-frame tubing
15×20 mm
T 1–2 mm — Small rectangular legs
15×30 mm
T 1–3 mm — Side chairs, light sled frames
15×50 mm
T 1–2 mm — Bench and table frames
20×30 mm
T 1–2 mm — Standard sled chair front tube
20×40 mm
T 1–3 mm — Commercial sled frames
20×50 mm
T 0.8–2 mm — Bench and shelf frames
25×40 mm
T 1–2 mm — Medium sled frames, conference chairs
25×50 mm
T 1–2 mm — Heavy sled bases
30×50 mm
T 1–4 mm — Commercial and hospitality sled chairs
30×60 mm
T 1–4 mm — Heavy conference and stacking chairs
40×60 mm
T 1–2 mm — Heavy frame furniture
40×80 mm
T 1–4 mm — Large sled bases and bench frames
50×80–100 mm
T 1.5–3.5 mm — Heavy structural sled and bench frames
60×80–120 mm
T 1.5–4.5 mm — Large architectural and commercial frames

Also available with integrated PA6 pad: Rectangular Tube Plugs with Pad (13.8×27.5 mm and 20×30 mm). Smooth-fit versions without ribs: Smooth Fit Rectangular Tube Plugs. Also available: 15×40 mm, 15×80 mm, 18×30 mm, 20×25 mm, 20×60 mm, 20×80 mm, 20×100 mm, 25×35 mm, 25×60 mm, 25×100 mm, 30×40 mm, 30×70 mm, 30×80 mm, 30×100 mm, 30×110 mm, 40×50 mm, 40×100 mm, 50×70 mm. Black · Grey · White.

Specialty Profiles (Oval, Ellipse, Half Oval, Angled, Anti-Slip)

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 leg meets the floor at an angle rather than perpendicular. Anti-slip TPE plugs provide a non-slip rubber contact surface for legs that must stay in place.

15×30, 20×30, 20×40, 25×35, 25×50, 30×50 mm. Flat head and rounded head variants. Also: Domed and Extended. Black · Grey · White.
15×30 and 20×35–40 mm. Domed (rounded head) and Thin Head variants. Flat head also available. Black · Grey · White.
20×40, 30×40, 30×60 mm. For D-profile and half-round tube sections. Black.
Angled
Round: Ø 20–22 mm at 9° and 22°. Rectangular: 20×25 mm at 20°. Oval: 20×40 mm and 25×35 mm at 15°–18°. For legs that contact the floor at an angle.
Round: Ø 22 mm and Ø 28 mm. Oval with angle and pad slot: 25×35 mm. A slot in the plug body accepts a strip of felt. Combines a tube plug with a built-in gliding surface.
Round: Ø 30 mm. Extended conical head sits flush inside wide-diameter tube openings. Black.
Round: Ø 16–30 mm. The dome profile sits above the tube end. Also available: Half-Sphere Head for Ø 16–30 mm. Black · Grey · White.
Round: Ø 28 mm. TPE (thermoplastic elastomer) body provides a non-slip rubber contact surface. For legs that must stay in position on hard floors. Black.

Tube Plugs with Threaded Inserts

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.

Round Threaded Inserts · Extended Round Threaded Inserts

Ø 28 / M6
T 1–2 mm — 60 kg static load. Black · White.
Ø 28 / M8
T 1–2 mm — 80 kg static load. Black.
Ø 35 / M8 (Extended)
T 1–2 mm — 80 kg. Extended body for deeper insertion. Black.
Ø 40 / M8
T 1–2 mm — 80 kg. Black.
Ø 40 / M10
T 1–2 mm — 120 kg. Black.
Ø 40 / M12
T 1–2 mm — 150 kg. Black · Grey.
Ø 50 / M8
T 1–2 mm — 80 kg. Black.
Ø 50 / M10
T 1–2 mm — 120 kg. Black.

Square Threaded Inserts · Extended Square Threaded Inserts · Stainless Steel Square Threaded Inserts

20×20 / M8
T 1–2 mm — 80 kg. Black · Grey · White.
25×25 / M8
T 1–2 mm — 80 kg. Black · Grey.
30×30 / M8
T 1–2 mm — 80 kg. Black · Grey · White. Stainless steel insert available.
30×30 / M10
T 1–2 mm — 120 kg. Black · Grey · White. Stainless steel insert available.
30×30 / M12
T 1–2 mm — 150 kg. Black.
40×40 / M8
T 1–2 mm — 80 kg. Standard and extended lengths. Black · Grey · White. Stainless steel insert available.
40×40 / M10
T 1–2 mm — 120 kg. Black · Grey · White. Stainless steel insert available.
40×40 / M12
T 1–2 mm — 150 kg. Black · Grey.
45×45 / M8
T 1–2 mm — 80 kg. Black · Grey.
50×50 / M8
T 1–2 mm — 80 kg. Black · Grey · White.
50×50 / M10
T 1–2 mm — 120 kg. Black.
60×60 / M8 (Extended)
T 1–2 mm — 80 kg. Extended body. Black · Grey.

Rectangular Threaded Inserts

20×40 / M8
T 1–2 mm — 80 kg. Black.
30×50 / M8
T 1–2 mm — 80 kg. Black · Grey.
30×50 / M10
T 1–2 mm — 120 kg. Black.
30×60 / M8
T 1–2 mm — 80 kg. Black.
30×60 / M10
T 1–2 mm — 120 kg. Black · Grey.

External End Caps

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.

Round External End Caps

Fits Ø 10 mm and Ø 12 mm tube openings. Outer body diameter 15.5 mm. Height 35 mm. PE material. Black.

Square External End Caps

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

Square Rubber Feet with 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 protection point.

How to Measure Your Tube Leg

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 MeasureHow to MeasureWhat It Determines
Outer Diameter (round) or L×W (square/rect.)Measure across the outside of the tube with calipers or a rulerThe plug size (must equal the tube outer dimension)
Wall Thickness (T)Measure the tube wall with calipers at the cut endThe T range (your wall must fall within the plug’s listed T range)
Head Style (for oval and ellipse)Measure how far above the tube face the cap needs to sitFlat, rounded, or thin head variant
Thread Size (for leveling feet)Check the leveling foot shank size, not the tubeM6, 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 →

Materials

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 softness with full plastic recyclability.

STANDARD

PE — Polyethylene

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

PA — Polyamide

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

TPE — Thermoplastic Elastomer

Combines rubber characteristics with plastic processability. Excellent abrasion resistance. Rated from −51°C to +124°C. Available in 40–90 Shore A hardness. Available for select round-plug sizes by agreement.

Need Floor Protection on Tube-Leg Furniture?

Tube plugs 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.

Sled Base Glides

Designed specifically for sled-frame and cantilever chairs with rectangular tube bases. PA6 sliding surface mounted on a stainless steel or ABS carrier that attaches to the full length of the sled base.

Guides and Resources

Get the right plug before you order.

Selection Guide
How to Choose the Right Tube Plug
Inner plug or end cap? PE, PA, or TPE? Threaded insert? Walks through every decision point with examples from common furniture types.

Read guide →

Measurement Guide
How to Measure Tube Legs
How to measure outer diameter, wall thickness, and head height for round, square, rectangular, and specialty tube profiles.

Read guide →

Installation Guide
Installing Tube Plugs
Step-by-step press-fit installation, including how to remove and replace worn plugs without damaging the tube.

Read guide →