ASTM A270 Sanitary Stainless Steel Tube dimensions
What Is ASTM A270 Sanitary Tubing?
ASTM A270 is the standard specification for seamless and welded austenitic stainless steel sanitary tubing, designed for:Food and dairy systems,Pharmaceutical and biotech industries,Beverage and cosmetic processing,CIP/SIP pipelines,It emphasizes hygienic finish, cleanability, and dimensional precision, often accompanied by surface finishes such as mechanical polish or electropolish.
ASTM A270 Sanitary Stainless Steel Tube Size Chart
Below is a reference chart of common outside diameters (OD) and wall thicknesses for ASTM A270 tubes. All dimensions are in inches and millimeters.
| Tube Size (OD) | OD (in) | OD (mm) | Wall Thickness (in) | Wall (mm) | Schedule Equivalent |
|---|---|---|---|---|---|
| 1/2" | 0.500 | 12.70 | 0.065 | 1.65 | 10S / 16 SWG |
| 3/4" | 0.750 | 19.05 | 0.065 | 1.65 | 10S / 16 SWG |
| 1" | 1.000 | 25.40 | 0.065 / 0.083 | 1.65 / 2.11 | 10S / 14 SWG |
| 1-1/2" | 1.500 | 38.10 | 0.065 / 0.083 | 1.65 / 2.11 | 10S / 14 SWG |
| 2" | 2.000 | 50.80 | 0.065 / 0.109 | 1.65 / 2.77 | 10S / 12 SWG |
| 2-1/2" | 2.500 | 63.50 | 0.083 / 0.120 | 2.11 / 3.05 | 14 SWG / 11 SWG |
| 3" | 3.000 | 76.20 | 0.083 / 0.120 | 2.11 / 3.05 | 14 SWG / 11 SWG |
| 4" | 4.000 | 101.60 | 0.083 / 0.120 | 2.11 / 3.05 | 14 SWG / 11 SWG |
| 6" | 6.000 | 152.40 | 0.109 / 0.134 | 2.77 / 3.40 | 10S / 10 SWG |
📌 SWG = Standard Wire Gauge; 1.65 mm = ~16 SWG; 2.11 mm = ~14 SWG
Tolerances for ASTM A270 Sanitary Tubing
Unless otherwise specified:
| Parameter | Tolerance |
|---|---|
| Outside Diameter (OD) | ± 0.005 in (± 0.13 mm) |
| Wall Thickness | ± 10% |
| Length (standard) | 20 ft (6.1 m) random or cut to length |
👉 Closer tolerances may be required for ASME BPE applications.
🔍 Surface Finish Options (Sanitary Grade)
| Surface Finish | Roughness (Ra μin / μm) | Method |
|---|---|---|
| SF1 | ≤ 32 μin (0.8 μm) | Mechanical polish |
| SF4 | ≤ 15 μin (0.4 μm) | Electropolished |
| SF5/SF6 | ≤ 20 μin or better | Polished + passivated / cleaned |
Common Materials Used for A270 Tubes
| Material Grade | UNS No. | Description |
|---|---|---|
| 316L | S31603 | Excellent corrosion resistance (preferred) |
| 304 | S30400 | General-purpose stainless |
| 304L | S30403 | Better weldability |
End Configurations
Plain ends (PE)
Beveled ends (BE)
Orbital weld prep
Tri-Clamp or ferrule ends for clean connections
Ensure hygiene and compliance-choose certified ASTM A270 tubing. Inquire now.
