Seamless Steel Tubes for precision applications

EN10305-4: Seamless cold drawn tubes for hydraulic, grease/lubrication and pneumatic power systems.

NBK Phosphated and Oiled High Quality Bendable and Flareable Cold Drawn Seamless Carbon Steel.

For hydraulic applications, steel tubes are commonly used with a phosphate external coating which also provides corrosion resistance.

Other more corrosion resistant materials such as 304, 316 and Duplex Stainless Steels are also available for use with flared and retained ring systems.

  • European Origin of Material
  • E235+N (ST 37.4 NBK)
  • E355+N (ST 52.4 NBK)
  • Phosphated Internally and Externally
  • Oiled Internally and Externally
  • 6,000 mm (6 m) (-0, +50 mm)
  • Ends Plugged with Plastic Caps
  • Certification on EN 10204 3.1
  • Continuous Marking along the length including Heat Number


The only material acceptable for use with Tube-Mac® 37° Flare Systems is EN10305-4 (DIN2391c NBK). The allowable working pressure of the system may be less than the allowable working pressure of the tube.

Download our Seamless Steel Tubes PDF here for additional technical and ordering information.




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