86-025-5119 7362
English
日本語
한국어
français
Deutsch
Español
italiano
русский
português
Türkçe
Nederland
A SUS316L tube fitting is selected for the conditions it must contain, not simply because stainless steel sounds more robust than plastic. The current RUNZE sales-experience record describes a two-piece SUS316L fitting for precision fluid systems, with a stated pressure rating up to 50 MPa, a -196 to 450 degrees C working-temperature range, a 10-32 UNF thread, and compatibility with 1.6 mm OD metal tubing. It also describes a forged structure and a metal-seal design. These are strong screening attributes for HPLC, IC, GC, high-pressure gas, and precision pump connections, but the final choice still depends on tube OD, mating port, medium, temperature cycle, installation torque, and the exact tested assembly.
Quick answer: Choose a SUS316L tube fitting when the fluid path needs a metal connection, high-pressure capability, broad temperature coverage, and a defined 10-32 UNF interface for 1.6 mm OD metal tubing. The sales source states up to 50 MPa and -196 to 450 degrees C, but those are product-level screening references, not permission to operate at every combination of pressure, temperature, tube material, and cycling condition. Match the fitting to the tube OD and mating thread, confirm the metal-seal arrangement, install with the specified torque, and validate the complete assembly with the actual medium before release.
The sales-experience file identifies a two-piece SUS316L stainless-steel fitting intended for high-pressure fluid connections. It lists a maximum pressure level of 50 MPa, a working-temperature range of -196 to 450 degrees C, a 10-32 UNF thread, and a 1.6 mm OD metal-tube interface. The source describes a forged construction, a metal hard-seal arrangement, and suitability for analytical instruments and precision fluid-control equipment. It also reports a pull-out force of up to 45.54 kgf under a 1.0 N·m torque condition. Treat that pull-out value as a test result tied to the stated setup, not as a universal value for every tube, port, or assembly method.
The RUNZE fluid-connection catalog adds important interpretation rules. Its pressure tables distinguish safety pressure from failure pressure and note that many tests are performed with water at room temperature. The catalog also lists common thread families, including 10-32 UNF and 1/4-28 UNF, and emphasizes that results can vary with receiving-port material, actual tube diameter and tolerance, temperature, and solvent. Those caveats are essential when moving from a catalog screening value to an instrument qualification.
Factor | What to verify | Why it matters |
Pressure | Normal, peak, pulse, and proof conditions | Static pressure alone may miss pump pulses or valve transients |
Temperature | Minimum/maximum and thermal cycling | Seal stress and tube properties change across temperature |
Tube OD | 1.6 mm OD or another documented size | The ferrule/sleeve geometry must match the tube |
Thread | 10-32 UNF mating interface | A near-looking metric or UNF thread can still be incompatible |
Seal design | Metal seal and contact surfaces | Surface finish, alignment, and cleanliness affect leakage |
Medium | Gas, liquid, solvent, corrosive or reactive fluid | Material compatibility is application-specific |
A stated 50 MPa capability is useful for initial screening, but a system designer should ask how the value was defined. The sales source does not provide a full pressure-versus-temperature curve, pulse-fatigue result, tube grade, tube wall thickness, or production sample size for the 50 MPa statement. The catalog explains that its listed safety pressure is a derated value relative to the pressure at which leakage begins, and that testing is generally performed with water at room temperature unless otherwise stated. Therefore, pressure selection should include the complete fitting, tube, port, and fluid, not the fitting body in isolation.
• Separate continuous pressure, peak pressure, proof pressure, and burst or failure pressure.
• Check whether pump or valve events create pressure spikes above the nominal line pressure.
• Verify the weakest element: tube wall, port material, ferrule, seal surface, or fitting body.
• Apply the supplier's safety margin and do not convert a failure value into an operating limit.
The stated -196 to 450 degrees C range is broad enough to attract cryogenic, high-temperature, and laboratory applications. It still needs interpretation. The actual upper or lower limit may depend on seal geometry, tube material, thermal expansion, pressure, dwell time, and cycling rate. The source does not provide a complete compatibility matrix for every solvent, gas, or reactive medium. Data not available in source documents. Confirm the medium, exposure duration, pressure at temperature, and whether the connection is repeatedly cycled or assembled once.
Thread and tube geometry must be checked together. The sales source specifies 10-32 UNF and a 1.6 mm OD metal tube. The catalog's thread reference shows 10-32 UNF as a fine-thread interface distinct from 1/4-28 UNF, M6, and other options. Do not select by nominal outside appearance. Confirm the mating port's thread standard, engagement, sealing face, and available installation clearance. Then verify the tube's actual outside diameter and tolerance against the fitting's sleeve or ferrule.
The metal-seal architecture is especially sensitive to cleanliness, alignment, and surface condition. Any tube cut, burr, contamination, or angular misalignment can affect sealing even when the thread is correct. A production work instruction should define tube preparation, inspection, assembly torque, rework limits, and leak-test method.
For a low-pressure, room-temperature soft-tube connection, a polymer fitting may be adequate and more economical. A SUS316L tube fitting becomes more relevant when the application combines high pressure, a metal tube, wide temperature excursions, vibration, gas tightness, or chemical exposure that makes a polymer connection unsuitable. The point is not that stainless steel is always better; it is that the material and sealing architecture should match the duty. A high-pressure metal fitting is unnecessary if the actual system never approaches those conditions and has no special chemical or temperature requirement.
Application profile | Likely screening direction | Still required |
High pressure + metal tube | Evaluate SUS316L two-piece fitting | Pressure/temperature qualification of complete path |
High temperature or cryogenic cycle | Evaluate metal body and seal architecture | Thermal-cycle and leak test at condition |
Routine low-pressure soft tubing | Consider an appropriate polymer or barb connection | Chemical compatibility and retention check |
Precision analytical instrument | Check 10-32 UNF and 1.6 mm OD integration | Port, dead-volume, cleanliness, and service review |
1. Confirm pressure, temperature, medium, tube OD, tube material, mating port, and expected vibration before ordering.
2. Verify the 10-32 UNF thread with a controlled drawing or gauge; do not rely on a visual comparison.
3. Prepare the 1.6 mm OD metal tube with a square, burr-free cut and inspect the sealing region.
4. Use the specified two-piece assembly and the supplier's torque instruction; record the tool and torque value.
5. Leak-test the complete assembly with a method appropriate to the medium and pressure. Water-only data may not represent gas tightness or solvent behavior.
6. Repeat after the relevant thermal cycle, pressure pulse, vibration exposure, or maintenance event.
7. Record lot, tube dimensions, torque, test fluid, temperature, pressure, and acceptance criterion for traceability.
The sales-experience source states a maximum pressure level of up to 50 MPa. The operating limit for a real assembly must consider temperature, tube, port, pressure cycling, and the supplier's safety margin.
The source lists -196 to 450 degrees C. Confirm the exact seal, tube, medium, pressure, dwell time, and thermal-cycle requirements before using the range as an application limit.
The source specifies a 10-32 UNF thread and a 1.6 mm OD metal tube. Verify the mating port and actual tube tolerance against the controlled drawing.
No. It is reported under a 1.0 N·m torque condition and should be treated as a setup-specific test result. Tube material, dimensions, assembly, and test method can change retention.
A metal-seal fitting is worth evaluating when pressure, temperature, gas tightness, vibration, or metal-tube integration exceed the needs of a routine low-pressure plastic connection. It is not automatically the best choice for every system.
The available source does not provide a combined pressure-temperature envelope. Data not available in source documents. Request or generate validation for the actual combined condition.
Confirm thread standard, tube OD, tube preparation, alignment, and torque. Then leak-test the complete tube-fitting-port assembly using the actual acceptance method.
A SUS316L tube fitting is a high-duty connection choice when the complete fluid path requires metal construction, high-pressure capability, broad temperature screening, and a defined 10-32 UNF interface for 1.6 mm OD metal tubing. The source evidence supports those selection criteria and reports a setup-specific pull-out result, while the RUNZE catalog explains why pressure and leak data must be interpreted with tube, port, temperature, solvent, and test-method context. Use the SUS316L tube fitting as a qualified system component: verify the controlled geometry, assemble with the specified torque, and validate the final medium and pressure-temperature cycle before release.
