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Fuel Injection Tube

Fuel Injection Tube
Usui's Fuel Injection Tubes are used in large numbers in all kinds of diesel engines for automobiles, ships, construction equipment, and agricultural machinery.

The high precision and cleanliness of the internal surfaces are guaranteed. Usui's Injection Tubes are suitable for diesel engines which require high pressure Fuel Injection Tubes with extreme reliability with respect to erosion due to cavitation.

USIT Tube®

USIT Tube® is a specially-processed tube whose internal surface is free from defect.

"You can select from USIT Tubes® the most suitable fuel injection tube to improve the performance of your engine!"

Characteristics of USIT Tube®

Kind Mark of internal grade Depth of defect Mark  of hardness Standard hardness
USIT A Less than
80 µm
C Lower than HV117
B Less than
30 µm
D Higher than HV170


Example of Combination
  • USIT-AC- Suitable for high pressure injection engine.
  • USIT-AD- Suitable for high pressure injection engine and effective against cavitation.
  • USIT-BC- Suitable for special high pressure injection engine.
  • USIT-BD- Suitable for special high pressure injection engine and effective against cavitation.
Internal Surface Roughness

(USIT-BC) Max. internal surface defect: less than 30 µm.

Vertical Section

Horizontal Section


UBRID Tube®

UBRID Tube® is a compound tube composed of a SUS 304 interior tube and a STS 35 exterior tube.

  • Withstands pressure greater than 1000kgf/cm2.
  • Exceptionally resistant to cavitation erosion under conditions of high pressure injection.
  • Excellent resistance to alcoholic fuels.


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