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Hexagonal inside and outside round steel tubes are special-profile steel products combining a hexagonal exterior with a circular internal bore. Manufactured from high-quality carbon steel, alloy steel, or stainless steel, these tubes are widely used in mechanical parts, automotive components, and precision equipment where enhanced torque transmission and aesthetic design are required.
| Shape | Hexagonal outside, round inside |
| Outer Across Flats | 10 mm – 120 mm |
| Inner Diameter | 6 mm – 100 mm |
| Wall Thickness | 1 mm – 10 mm |
| Length | 1 m – 12 m (customized lengths available) |
| Manufacturing Process | Cold drawn, hot rolled, or precision seamless |
| Surface Finish | Black, polished, galvanized, or coated |
Unique Profile – Hexagonal exterior for anti-slip, decorative, or mechanical fitting purposes.
Precision Bore – Round interior ensures uniform flow or shaft fitment.
High Strength – Suitable for torque-bearing mechanical components.
Customizable Materials – Available in carbon steel, alloy steel, or stainless steel.
Versatile Applications – Used in machinery, furniture, automotive, and decorative structures.
| Element | C (max) | Si (max) | Mn | P (max) | S (max) |
| 10# | 0.07–0.13 | 0.17–0.37 | 0.35–0.65 | 0.035 | 0.035 |
| 20# | 0.17–0.23 | 0.17–0.37 | 0.35–0.65 | 0.035 | 0.035 |
| Property | Tensile Strength | Yield Strength | Elongation | Impact Energy | Modulus of Elasticity |
| 10# | 335–470 | ≥ 205 | ≥ 33 | ≥ 39 | ~ 200 |
| 20# | 410–550 | ≥ 245 | ≥ 25 | ≥ 39 | ~ 200 |
Carbon Steel: Q235B, Q345B
Alloy Steel: 20Cr, 40Cr, 42CrMo
Stainless Steel: 304, 316L
Mechanical Engineering: Shafts, couplings, and torque-transmitting components
Automotive Industry: Axles, drive shafts, steering columns
Furniture & Decoration: Table frames, handles, and railing systems
Hydraulic & Pneumatic Systems: Tubes for connectors and fittings
Sports Equipment: Bicycle parts, fitness machine frames
ASTM A29 1010 / 1020 – Low carbon steels (USA)
EN C10E / C20E – Non-alloy steels (Europe)
JIS S10C / S20C – Carbon steels (Japan)
IS 1570 C10 / C20 – Carbon steel grades (India)
A: manufacturer,also can do trading.
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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Main Product:
Seamless Steel Tubes,
Welded Precision Steel Pipes,
Automotive Steel Tubes,
Carbon steel tubes ,
Stainless Steel Tubes,
Special Shaped Steel Tubes
