SUS304 / 1.4301 Cold Drawn Seamless Hexagonal  Tube with Round Inner Bore, Custom Size

TP304 (UNS S30400 / 1.4301) seamless tube with hexagonal outer profile and precision round inner bore is cold‑drawn and solution annealed. This special hollow bar combines the anti‑slip feature of hexagon outer surface and smooth round inner channel for fluid passage. It delivers excellent general corrosion resistance, good formability and reliable weldability. We supply custom across‑flat size, inner diameter, wall thickness and cut lengths, with full MTC 3.1 / 3.2, third‑party inspection acceptable.

Chemical Composition (wt%, ASTM A312 TP304)

Mechanical Properties (Solution Annealed, Room Temp, ASTM A312)

表格

Product Specifications

• Shape: Hex outer, concentric round inner bore, seamless (no longitudinal weld)
• Surface options: Pickled No.1, cold drawn bright, polished
• Size range: Custom across‑flat, inner diameter & wall thickness; common length 6 m or cut‑to‑length
• Tolerance: Custom concentricity, bore tolerance, hex dimension tolerance available
• Package: Wooden crates / bundles, marked with heat number, grade & dimension
• Certificate: EN 10204 3.1 / 3.2, SGS / BV inspection available

Applications

• Hydraulic & pneumatic fittings, special hollow bolt blanks
• Machinery transmission shafts, textile & packaging machine components
• Food & beverage equipment, sanitary fluid passage parts
• Instrumentation tubes, valve bodies, anti‑twist structural hollow parts
• Marine general components, chemical pipelines under mild corrosion

AQ

Q1: What is the material standard for this hex seamless tube?

A: It complies with ASTM A312 TP304, UNS S30400, EN 1.4301, GB 06Cr19Ni10, JIS SUS304. Solution annealed condition.

Q2: Is it seamless or welded?

A: Fully seamless cold drawn hollow bar, no longitudinal weld line. Outer hexagonal shape with concentric round inner bore.

Q3: Can you provide custom sizes?

A: Yes. We can customize across-flat size, inner diameter, wall thickness, tolerance and cut lengths. Minimum order quantity depends on dimensions.

Q4: What surface finishes are available?

A: Pickled No.1 finish, cold drawn bright finish, or mirror polishing as requested.

Q5: What certificates can you supply?

A: MTC EN 10204 3.1 is standard. 3.2 certificate, SGS, BV or third-party inspection can be arranged before shipment.

Q6: What is your delivery time?

A: For regular sizes: 7–15 working days. For special custom profiles or non-standard tolerances: 20–30 working days.

Q7: What are your payment terms?

A: We accept T/T, L/C at sight. Payment can be made in two installments: 50% deposit in advance, balance before shipment. Other negotiable terms upon request.

Q8: How do you pack the goods?

A: Packed in bundles with waterproof paper, then secured in wooden crates. Each bundle is marked with heat number, grade and dimensions to avoid confusion.

Q9: Can you offer samples?

A: Small free samples are available; buyers only need to cover the courier freight.

Q10: What applications is this tube mainly used for?

A: Widely used for hollow bolt blanks, hydraulic/pneumatic fittings, anti-twist hollow shafts, instrument parts, food machinery components and mild-corrosion chemical equipment.

Q11: What tolerance can you guarantee?

A: Standard tolerance for hex flats, inner bore and concentricity. Tight custom tolerances are available for precision mechanical parts, extra cost applies.