ASTM A269 TP316L Bright Annealed Tubing for Instrument Piping
May 19, 2026
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ASTM A269 TP316L stainless steel BA tube, also known as clean tubing, gas line tubing, high-purity gas pipeline tubing, or instrumentation tubing, is mainly manufactured through multi-roll cold rolling combined with a bright annealing process. During controlled-atmosphere solution annealing, the tubing achieves clean, bright, and low-roughness inner and outer surfaces (Ra ≤ 0.4–0.6 μm).With precise dimensions, smooth surfaces, and excellent overall cleanliness, the inner surface without polishing can achieve an even better finish than mechanically polished tubing, effectively reducing fluid residue and contamination risks. It is especially suitable for high-purity gas systems, analytical instruments, and instrumentation piping systems that require extremely high cleanliness standards.
ASTM A269 TP316L stainless steel tubing we supply is manufactured using a cold-drawn + online bright annealing process. The outer diameter tolerance can be controlled within ±0.05 mm, with uniform wall thickness and excellent batch consistency. In addition, the tubing offers excellent flexibility, allowing small-radius bending installation to accommodate complex instrumentation layouts. It can also achieve leak-free connections with compression fittings such as Swagelok and Norgren, making it widely used in precision instrumentation control systems for petroleum, chemical, semiconductor, and related industries.
ASTM A269 TP316L Bright Annealed Tubing Specification
| Item | Specification Details |
|---|---|
| Product Name | ASTM A269 TP316L Bright Annealed Tubing |
| Outer Diameter (OD) | 4.76 mm – 25.4 mm (commonly 1/8" to 1") |
| Wall Thickness (WT) | 0.71 mm – 2.11 mm (e.g., 16 BWG ≈ 1.65 mm) |
| Length | Customized according to customer requirements; available in straight lengths or coil form (coiled tubing) |
| Delivery Condition | Cold drawn + bright annealed; high surface finish without additional polishing |
| Testing / Inspection | Eddy current testing (ET), hydrostatic testing (water pressure test) |
| Finishing Process | Straightening, fixed length cutting, polishing |
| Certifications | CE, ISO, MSDS; optional PED or TS certification depending on requirements |
| Packaging | Marking/ink jet printing, PE bags, end caps, shock-proof packaging, dust-proof protection packaging |
| Applications | Special gas and liquid transportation systems; also used as the base material for EP (Electropolished) tubing |
Mechanical Properties of SA269 TP316L Stainless Steel Tube
| GRADE | TENSILE STRESS (MPA) MIN |
YIELD STR 0.2% PROOF (MPA) MIN |
ELONG (% IN 50MM) MIN |
HARDNESS | |
|---|---|---|---|---|---|
| ROCKWELL B (HR B) MAX | BRINELL (HB) MAX | ||||
| SS 316L Tube | 485 | 170 | 40 | 95 | 217 |
316L Stainless Steel Tube Chemical Composition
| Material | C | MN | SI | P | S | CR | MO | NI | N | |
|---|---|---|---|---|---|---|---|---|---|---|
| SA269 TP 316L Tube | Min | - | - | - | - | - | 16.0 | 2.00 | 10.0 | - |
| Max | 0.03 | 2.0 | 0.75 | 0.045 | 0.03 | 18.0 | 3.00 | 14.0 | 0.10 |
Normal Size of Bright Annealed Stainless Steel Seamless Tubing
| Normal Size | |||||
| OD 3/16" | WT0.02" | 4.76x0.51mm | OD3/16" | WT0.028" | 4.76x0.71mm |
| OD3/16" | WT0.035" | 4.76x0.89mm | OD3/16" | WT0.049" | 4.76x1.24mm |
| OD0.24" | WT0.04" | 6x1mm | OD0.24" | WT0.06" | 6x1.5mm |
| OD1/4" | WT0.02" | 6.35x0.51mm | OD1/4" | WT0.028" | 6.35x0.71mm |
| OD1/4" | WT0.035" | 6.35x0.89mm | OD1/4" | WT0.049" | 6.35x1.24mm |
| OD1/4" | WT0.065" | 6.35x1.65mm | OD5/16" | WT0.028" | 7.94x0.71mm |
| OD5/16" | WT0.035" | 7.94x0.89mm | OD5/16" | WT0.049" | 7.94x1.24mm |
| OD5/16" | WT0.065" | 7.94x1.65mm | OD3/8" | WT0.028" | 9.53x0.71mm |
| OD3/8" | WT0.035" | 9.53x0.89mm | OD3/8" | WT0.049" | 9.53x1.24mm |
| OD3/8" | WT0.065" | 9.53x1.65mm | OD0.4" | WT0.04" | 10x1mm |
| OD0.4" | WT0.06" | 10x1.5mm | OD0.4" | WT0.079" | 10x2mm |
| OD0.47" | WT0.065" | 12x1mm | OD0.47" | WT0.06" | 12x1.5mm |
| OD1/2" | WT0.028" | 12.7x0.71mm | OD1/2" | WT0.035" | 12.7x0.89mm |
| OD1/2" | WT0.049" | 12.7x1.24mm | OD1/2" | WT0.065" | 12.7x1.65mm |
| OD0.55" | WT0.04" | 14x1mm | OD0.55" | WT0.06" | 14x1.5mm |
| OD5/8" | WT0.028" | 15.88x0.71mm | OD5/8" | WT0.035" | 15.88x0.89mm |
| OD5/8" | WT0.049" | 15.88x1.24mm | OD5/8" | WT0.065" | 15.88x1.65mm |
| OD5/8" | WT0.083" | 15.88x2.11mm | OD0.63" | WT0.065" | 16x1mm |
| OD0.63" | WT0.06" | 16x1.5mm | OD0.63" | WT0.079" | 16x2mm |
| OD3/4" | WT0.04" | 19.05x1mm | OD3/4" | WT0.049" | 19.05x1.24mm |
| OD3/4" | WT0.065" | 19.05x1.65mm | OD3/4" | WT0.083" | 19.05x2.11mm |
| OD1" | WT0.049" | 25.4x1.24mm | OD1" | WT0.0665" | 25.4x1.65mm |
| OD1" | WT0.083" | 25.4x2.11mm | OD1" | WT0.1" | 25.4x2.54mm |
If you have specific specifications, please feel free to place an order. GNEE has a large inventory of best-selling products for you to choose from. Please contact our factory today. We offer competitive prices and excellent service.
Our export case:
Purified water system for the pharmaceutical industry. A GMP-certified pharmaceutical plant uses TP316L seamless pipes to construct its distribution system, adhering to ASTM A269 standard + supplementary requirement S1 (stress annealing), with an inner surface Ra≤0.5μm electropolished, and passing the ASTM A262 Practice E intergranular corrosion test.
Below are case studies from our export clients.
GNEE stainless steel welcomes direct inspection by customers, or customers to commission third-party inspection agencies for inspection. We provide a complete set of inspection documents, including a manufacturer's test certificate (TC) conforming to EN 10204 3.1, raw material certificates, heat treatment/dimensional non-destructive testing (HT/DNT) reports, and third-party inspection reports.
Material Testing: All materials undergo rigorous quality control testing before shipment to ensure full compliance with applicable standards and customer specifications. Testing items include:
1. Mechanical property testing
2. Hardness testing
3. Optical emission spectrometry (OES) chemical composition analysis
4. Material composition analysis (PMI)
5. Flattening test
6. Flaring test
All our stainless steel seamless tubing is packaged according to international standards to prevent any possible damage or loss. By default, we bundle the finished tubing together in batches using thick woven plastic bags.
For some special tubing that is easily soiled, scratched, subjected to pressure, or easily damaged during handling, we recommend using wooden crates for protection. Please note that wooden crate packaging incurs additional costs, including not only the cost of the crate itself but also the increased shipping costs, especially in the case of air freight. To enhance the customer experience, we can also provide customized packaging according to your specific requirements.
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