Home > Product > Ferrule Fittings > Technical Resources > Tube Fittings Selection Guide
Choosing the correct tube fitting is critical for ensuring leak-proof, safe, and long-lasting connections in fluid and gas systems. At Perfect Engineers, our brand PE-LOCK offers a wide range of double ferrule compression fittings designed for instrumentation, process piping, gas delivery, and high-pressure systems.
This guide helps you make informed decisions on tube size, material, thread type, pressure rating, and application suitability, so you can avoid system failure, leaks, or compatibility issues.
Know Your Application Type
| System Type | Considerations |
|---|---|
| Hydraulic | Pressure rating, vibration resistance |
| Pneumatic | Leak-free sealing, fast disassembly |
| Chemical/Corrosive | Alloy selection, media compatibility |
| Cleanroom/Pharma | Surface finish, contamination-free assembly |
| Gas (O₂, H₂, N₂) | Leak-tight design, helium testing, spark resistance |
| Vacuum/UHV | Zero-leakage, surface finish, helium leak certification |
| Industry | Best PE-LOCK Fitting Type |
|---|---|
| Oil & Gas | SS316L / Inconel, NPT Thread, Leak-Tested |
| Pharma / Biotech | Electropolished SS316L, Metric Sizes, Clean Packed |
| Chemical Processing | Hastelloy / Monel, BSP Thread, Corrosion-Resistant |
| Marine / Offshore | Super Duplex / Monel, BSPT Thread, Salt Spray Proof |
| Aerospace / Cryogenic | Titanium / Inconel, UNF Thread, Vibration Safe |
| Media/Environment | Recommended Material |
|---|---|
| Steam / Hot Water | SS316L, SS321 |
| Seawater / Chloride | Monel, Super Duplex, Titanium |
| Acidic / Oxidizing Media | Hastelloy C276, Inconel 625 |
| UHP Gas / Clean Fluids | SS316L Electropolished |
| Medical Oxygen | Brass / SS316L Non-Oil Treated |
Refer to [Chemical Compatibility Chart]
| Region / Standard | Common Thread Types |
|---|---|
| Global Standard | NPT, BSP, BSPT |
| U.S. / Aviation | UNF, SAE, JIC |
| Europe / Process Plants | ISO, DIN, Metric Fine |
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| Requirement | PE-LOCK Support |
|---|---|
| Cleanroom Packaging | Yes (Class 100 available) |
| Helium Leak Testing | Available up to 1×10⁻⁹ mbar·l/s |
| MTC, Hydro Test, Certifications | Supplied with each batch |
| Custom Branding / OEM Kits | Yes – Engraved, barcoded, private labeled |
| Fitting Type | Function |
|---|---|
| Straight / Reducing Union | Tube-to-tube inline connections |
| Male / Female Connector | Tube-to-thread transitions |
| Union Elbow / Tee | Directional changes with minimal pressure loss |
| Bulkhead Union | Secure tube runs through panel/enclosure walls |
| End Cap / Plug | Temporary or permanent line terminations |
Yes. Our helium leak-tested fittings are suitable for compressed gases, including O₂ and H₂.
Use our temperature factor table above. For example, SS316L at 400°C = 72% of its rated pressure.
Yes. We provide hydro test, helium leak test, and pressure validation reports on request.
Yes. PE-LOCK fittings follow ASME, ASTM, and DIN codes as per application needs.
Yes. Contact us with alloy and tube specs to receive application-specific pressure data.
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