Stainless steel instrument tubing - Zhejiang Ruimai stainless steel tube Co., Ltd-hydraulic pipe, heat exchanger tubes, line pipe

Stainless steel instrument tubing

Instrument tubing

of Ruimai is available in a wide range of corrosion-resistant stainless steels and nickel alloys covering outside diameters from OD 2 mm to 50 mm. All sizes of instrument tubing are supplied with smooth surfaces and Precise dimensional tolerances reducing the risk of leakages when connecting tubes with couplings.

Instrumentation tubing can be supplied in straight lengths of 6 meters or other lengths, and in coiled tubes.

Stainless steel instrument tubing

Instrument tubing is characterized by high cleanliness, and instrumentation tubing with OD larger than 5 mm are delivered with caps on ends for transport protection against inside contamination.

  • Delivery conditions:
    Instrument tube /pipe with OD up to 38.1 mm (1.5 in.) are delivered in bright annealed .
    Instrument pipe /tube with OD larger than 38.1 mm are delivered in the annealed and pickled condition or polished condition.
    And of course instrument tubing can be supplied in annealed and pickled condition for all sizes upon customers request.
  • Sizes and tolerance of Instrument tubing / instrumentation tubing as below:


Size OD, mmTolerances OD, mmWall thickness, %
For instrument tube with OD <6 mm, tolerances according to ASTM A632
< 6–4.76 +0.10 / -0 +/-10
< 4.76–2.38 +0.08 / -0 +/-10
< 2.38 +0.05 / -0 +/-10
Size OD, mmTolerances OD, mmWall thickness, %
For instrument tube with OD 6.35-50.8 mm according to EN 10305-1

6.35 - 30



 Steel grades

Ruimai instrument tubing / instrumentation tubing is available in various stainless steel grades, duplex steel/ super duplex steel grade, nickel alloy grades, Titanium alloy grades.

ASTM / AISI: 316 /316L, 304/304L, 321/321H, 316Ti, 347 / 347H, S31803, S32750,S32760, 2205, 904 / 904L. 
EN/DIN: 1.4301/1.4307, 1.4401/1.4404, 1.4541/1.4878, 1.4571, 1.4462, 1.4410, 1.4539.


Stainless steel instrument tubing / instrumentation tubing is featured by high cleanness, smooth roughness inside surface, good corrosion resistance, accurate dimensions.

Stainless steel instrument tubing


Instrumentation tubing / instrument tubing is widely used in instruments, machines, devices in various industrials.