Baojing Steel supplies high-precision stainless steel precision tubes manufactured for applications requiring tight dimensional tolerances, controlled wall thickness, excellent surface quality and consistent mechanical performance.
Our precision tubes are available in seamless and welded constructions, with cold drawn, cold rolled and precision-finished options for demanding applications.
Small OD · Thin Wall · Tight Tolerances · Smooth Surface · High Dimensional Accuracy
304 / 304L · 316 / 316L · 321 · 316Ti · 2205 · 2507 · Nickel Alloys
Precision control of:
Outside Diameter · Inside Diameter · Wall Thickness · Ovality · Straightness · Length
Suitable for applications where conventional industrial tubes cannot meet the required dimensional accuracy.
Customized dimensional tolerances can be supplied according to:
ASTM / EN / DIN / JIS / GB/T standards, drawings and customer specifications.
Suitable for precision applications requiring:
Small Outside Diameter + Thin Wall + Consistent Wall Thickness
Available with:
Bright Annealed · Polished · Pickled · Ground · Customized Surface
Cold drawing and cold rolling can improve:
Dimensional Accuracy · Surface Finish · Mechanical Properties · Wall Thickness Control
Available:
PMI · Dimensional Inspection · Surface Inspection · Eddy Current · UT · Hydrostatic Testing · Mechanical Testing
| Item | Specification |
|---|---|
| Product | Stainless Steel Precision Tube |
| Construction | Seamless / Welded |
| Manufacturing | Cold Drawn / Cold Rolled / Precision Finished |
| Outside Diameter | 0.5–630 mm depending on grade and production route |
| Wall Thickness | 0.05–30 mm depending on OD and grade |
| Length | Fixed / Random / Customized |
| OD Tolerance | Customized / According to Standard |
| WT Tolerance | Customized / According to Standard |
| ID Tolerance | Customized |
| Ovality | Controlled according to requirements |
| Straightness | Precision Controlled |
| Surface | BA / Polished / Pickled / Bright / Ground |
| Materials | Austenitic / Duplex / Super Duplex / Nickel Alloy |
| Standards | ASTM / ASME / EN / DIN / JIS / GB/T |
| Inspection | Dimensional / PMI / ET / UT / Mechanical / Hydrostatic |
| Certificate | EN 10204 3.1 / 3.2 |
| Packing | Export Seaworthy Packing |
Note: The actual available OD and wall thickness combination depends on material grade, production route, standard and tolerance requirements. Special dimensions can be evaluated according to drawings.
Suitable for instrumentation, medical equipment, sensors, pneumatic systems and precision mechanical components.
| Outside Diameter | Common Wall Thickness |
|---|---|
| 0.5 mm | 0.05 / 0.08 / 0.10 mm |
| 0.8 mm | 0.05 / 0.08 / 0.10 / 0.15 mm |
| 1.0 mm | 0.05 / 0.08 / 0.10 / 0.15 / 0.20 mm |
| 1.2 mm | 0.10 / 0.15 / 0.20 mm |
| 1.5 mm | 0.10 / 0.15 / 0.20 / 0.25 mm |
| 2.0 mm | 0.10 / 0.15 / 0.20 / 0.25 / 0.30 mm |
| 2.5 mm | 0.15 / 0.20 / 0.25 / 0.30 mm |
| 3.0 mm | 0.15 / 0.20 / 0.25 / 0.30 / 0.50 mm |
| 4.0 mm | 0.20 / 0.30 / 0.40 / 0.50 mm |
| 5.0 mm | 0.30 / 0.40 / 0.50 / 0.60 mm |
| 6.0 mm | 0.30 / 0.40 / 0.50 / 0.60 / 1.00 mm |
| 8.0 mm | 0.50 / 0.60 / 0.80 / 1.00 mm |
| 10.0 mm | 0.50 / 0.80 / 1.00 / 1.20 mm |
Commonly used for hydraulic systems, instrumentation, automotive components, heat exchangers and mechanical applications.
| Outside Diameter | Common Wall Thickness |
|---|---|
| 12 mm | 0.50 / 0.80 / 1.00 / 1.20 / 1.50 mm |
| 14 mm | 0.80 / 1.00 / 1.20 / 1.50 mm |
| 15 mm | 0.80 / 1.00 / 1.20 / 1.50 / 2.00 mm |
| 16 mm | 0.80 / 1.00 / 1.20 / 1.50 / 2.00 mm |
| 18 mm | 1.00 / 1.20 / 1.50 / 2.00 mm |
| 20 mm | 1.00 / 1.20 / 1.50 / 2.00 / 2.50 mm |
| 22 mm | 1.00 / 1.20 / 1.50 / 2.00 / 2.50 mm |
| 25 mm | 1.00 / 1.20 / 1.50 / 2.00 / 2.50 / 3.00 mm |
| 28 mm | 1.20 / 1.50 / 2.00 / 2.50 / 3.00 mm |
| 30 mm | 1.20 / 1.50 / 2.00 / 2.50 / 3.00 mm |
| 32 mm | 1.50 / 2.00 / 2.50 / 3.00 / 4.00 mm |
| 35 mm | 1.50 / 2.00 / 2.50 / 3.00 / 4.00 mm |
| 38 mm | 1.50 / 2.00 / 2.50 / 3.00 / 4.00 mm |
| 40 mm | 1.50 / 2.00 / 2.50 / 3.00 / 4.00 mm |
| 42 mm | 1.50 / 2.00 / 2.50 / 3.00 / 4.00 mm |
| 45 mm | 1.50 / 2.00 / 2.50 / 3.00 / 4.00 mm |
| 48 mm | 1.50 / 2.00 / 2.50 / 3.00 / 4.00 / 5.00 mm |
| 50 mm | 1.50 / 2.00 / 2.50 / 3.00 / 4.00 / 5.00 mm |
Suitable for industrial equipment, heat exchangers, hydraulic systems, mechanical engineering and process equipment.
| Outside Diameter | Common Wall Thickness |
|---|---|
| 55 mm | 2.00 / 2.50 / 3.00 / 4.00 / 5.00 mm |
| 60 mm | 2.00 / 2.50 / 3.00 / 4.00 / 5.00 / 6.00 mm |
| 63.5 mm | 2.00 / 2.50 / 3.00 / 4.00 / 5.00 / 6.00 mm |
| 70 mm | 2.00 / 2.50 / 3.00 / 4.00 / 5.00 / 6.00 mm |
| 76.1 mm | 2.00 / 2.50 / 3.00 / 4.00 / 5.00 / 6.00 mm |
| 80 mm | 2.50 / 3.00 / 4.00 / 5.00 / 6.00 / 8.00 mm |
| 88.9 mm | 2.50 / 3.00 / 4.00 / 5.00 / 6.00 / 8.00 mm |
| 100 mm | 3.00 / 4.00 / 5.00 / 6.00 / 8.00 / 10.00 mm |
| 108 mm | 3.00 / 4.00 / 5.00 / 6.00 / 8.00 / 10.00 mm |
| 114.3 mm | 3.00 / 4.00 / 5.00 / 6.00 / 8.00 / 10.00 mm |
| 127 mm | 3.00 / 4.00 / 5.00 / 6.00 / 8.00 / 10.00 mm |
| 133 mm | 3.00 / 4.00 / 5.00 / 6.00 / 8.00 / 10.00 mm |
| 139.7 mm | 3.00 / 4.00 / 5.00 / 6.00 / 8.00 / 10.00 mm |
| 152.4 mm | 4.00 / 5.00 / 6.00 / 8.00 / 10.00 / 12.00 mm |
| 159 mm | 4.00 / 5.00 / 6.00 / 8.00 / 10.00 / 12.00 mm |
| 168.3 mm | 4.00 / 5.00 / 6.00 / 8.00 / 10.00 / 12.00 mm |
| 219.1 mm | 5.00 / 6.00 / 8.00 / 10.00 / 12.00 / 14.00 mm |
| 273 mm | 6.00 / 8.00 / 10.00 / 12.00 / 14.00 / 16.00 mm |
| 323.9 mm | 6.00 / 8.00 / 10.00 / 12.00 / 14.00 / 16.00 mm |
| 355.6 mm | 6.00 / 8.00 / 10.00 / 12.00 / 16.00 / 20.00 mm |
| 406.4 mm | 8.00 / 10.00 / 12.00 / 16.00 / 20.00 mm |
| 457 mm | 8.00 / 10.00 / 12.00 / 16.00 / 20.00 mm |
| 508 mm | 10.00 / 12.00 / 16.00 / 20.00 / 25.00 mm |
| 610 mm | 10.00 / 12.00 / 16.00 / 20.00 / 25.00 / 30.00 mm |
| 630 mm | 10.00 / 12.00 / 16.00 / 20.00 / 25.00 / 30.00 mm |
Important: The above dimensions represent common precision/industrial tube size combinations rather than a single universal standard size table. Actual combinations depend on the grade, manufacturing route, applicable standard, OD/WT ratio and required tolerance.
Precision tubes can be supplied with controlled tolerances for:
Outside Diameter (OD)
Inside Diameter (ID)
Wall Thickness (WT)
Length
Ovality
Straightness
For demanding applications, customers can specify the tolerance directly on drawings, for example:
25.00 ± 0.05 mm OD
20.00 ± 0.05 mm ID
2.50 ± 0.10 mm WT
The final tolerance should be confirmed according to the applicable standard, manufacturing method and customer drawing.
304 / 304L / 316 / 316L / 321 / 321H / 316Ti / 317L / 347 / 347H / 309S / 310S
2205 / S31803 / S32205
2507 / S32750 / S32760
904L / 254 SMO
400 / 600 / 625 / 800 / 800H / 800HT Series
Provides excellent control of:
OD · ID · Wall Thickness · Surface Finish · Mechanical Properties
Suitable for precision tubes requiring:
Tight Wall Thickness · Excellent Surface Quality · High Dimensional Accuracy
Provides a clean, bright surface with controlled metallurgical properties.
Available where enhanced surface smoothness and appearance are required.
| Application | Recommended Grades | Key Requirements |
|---|---|---|
| Instrumentation | 304 / 316L | Tight dimensions & clean surface |
| Hydraulic Systems | 304 / 316L / 2205 | Pressure & dimensional accuracy |
| Automotive | 304 / 316 / 321 | Precision forming & durability |
| Medical Equipment | 316L | Surface quality & corrosion resistance |
| Pharmaceutical | 316L | Cleanability & corrosion resistance |
| Heat Exchangers | 304L / 316L / 321 | Heat & corrosion resistance |
| Pneumatic Systems | 304 / 316L | Dimensional consistency |
| Mechanical Components | 304 / 316 / 400 Series | Strength & precision |
| Sensors & Instrumentation | 304 / 316L | Small OD & tight tolerance |
| Oil & Gas | 316L / 2205 / 2507 | Corrosion & pressure resistance |
| Chemical Equipment | 316L / 904L / 2205 | Corrosion resistance |
Precision tubes require stricter dimensional and surface control than standard industrial tubing.
OD · ID · WT · Ovality · Straightness · Length
PMI · Chemical Analysis · MTC
Eddy Current · Ultrasonic Testing · Hydrostatic Testing
Tensile Strength · Yield Strength · Elongation · Hardness
Inspection for:
Scratches · Pits · Cracks · Scale · Dents · Surface Defects
IGC testing available according to applicable material standards and project requirements.
Precision stainless steel tubes can be supplied according to applicable:
ASTM · ASME · EN · DIN · JIS · GB/T
Common references include:
ASTM A213 · ASTM A269 · ASTM A312 · ASTM A789 · ASTM A790
and applicable EN / DIN / JIS / GB/T precision tube standards according to grade and application.
| Precision Tube | Standard Industrial Tube | |
|---|---|---|
| Dimensional Accuracy | High | Standard |
| OD / ID Tolerance | Tight | Standard |
| Wall Thickness Control | High | Standard |
| Surface Finish | Excellent | Standard |
| Small Diameter | Excellent | Limited |
| Thin Wall | Excellent | Limited |
| Cold Drawing / Rolling | Common | Optional |
| Typical Applications | Precision / Critical Components | General Industrial |
Precision Dimensions
Strict control of OD, ID, wall thickness, ovality and straightness.
Wide Size Range
From micro/small-diameter precision tubes to large industrial tubes.
Multiple Materials
304L, 316L, 321H, 2205, 2507, 904L, nickel alloys and more.
Customized Specifications
We can manufacture according to customer drawings, OD × WT × length and tolerance requirements.
Comprehensive Testing
PMI, ET, UT, hydrostatic, mechanical and IGC testing available.
Project Documentation
MTC, inspection reports and third-party inspection can be supplied according to project requirements.
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