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The Female Tube Adapter (Metric Tube to NPT) is a high-performance instrumentation fitting designed to provide a secure, leak-proof transition between metric tubing and a male NPT threaded component. It features a smooth, unthreaded tube stub on one end that is inserted into a standard double-ferrule compression fitting, while the opposite end consists of a female NPT tapered thread. This “swing-free” design is particularly advantageous in tight spaces, as it allows the adapter to be connected to a male-threaded instrument—such as a pressure gauge or transmitter—without needing to rotate the tubing itself. Typically manufactured from 316 stainless steel for maximum corrosion resistance and pressure integrity, these adapters are essential for connecting metric systems to NPT-threaded valves and sensors in industrial process and analytical environments.
| FEMALE ADAPTER | ||||||
|---|---|---|---|---|---|---|
| Metric Tube | Basic Ordering Number | Dimensions mm (in) | ||||
| T-Tube O.D. (mm.) | P-NPT Thread Size | L | B | E | F | |
| 3 | 1/8 | VFTA-SS-3M-2N | 28.8(1.13) | 10.4(0.41) | 1.3(0.05) | 14.0(0.55) |
| 4 | 1/8 | VFTA-SS-4M-2N | 33.3(1.31) | 10.4(0.41) | 2.4(0.09) | 14.0(0.55) |
| 6 | 1/8 | VFTA-SS-6M-2N | 32.5(1.28) | 10.4(0.41) | 4.1(0.16) | 14.0(0.55) |
| 6 | 1/4 | VFTA-SS-6M-4N | 37.1(1.46) | 15.0(0.59) | 4.1(0.16) | 19.0(0.75) |
| 8 | 1/8 | VFTA-SS-8M-2N | 35.1(1.38) | 10.4(0.41) | 5.6(0.22) | 14.0(0.55) |
| 8 | 1/4 | VFTA-SS-8M-4N | 37.6(1.48) | 15.0(0.59) | 5.6(0.22) | 19.0(0.75) |
| 8 | 3/8 | VFTA-SS-8M-6N | 36.5(1.44) | 15.0(0.59) | 5.6(0.22) | 22.0(0.87) |
| 10 | 1/4 | VFTA-SS-10M-4N | 38.1(1.50) | 15.0(0.59) | 7.1(0.28) | 19.0(0.75) |
| 10 | 3/8 | VFTA-SS-10M-6N | 40.1(1.58) | 15.0(0.59) | 7.1(0.28) | 22.0(0.87) |
| 10 | 1/2 | VFTA-SS-10M-8N | 46.5(1.83) | 19.8(0.78) | 7.1(0.28) | 27.0(1.06) |
| 12 | 1/4 | VFTA-SS-12M-4N | 43.7(1.72) | 15.0(0.59) | 8.8(0.35) | 19.0(0.75) |
| 12 | 3/8 | VFTA-SS-12M-6N | 42.9(1.69) | 15.0(0.59) | 8.8(0.35) | 22.0(0.87) |
| 12 | 1/2 | VFTA-SS-12M-8N | 52.3(2.06) | 19.8(0.78) | 8.8(0.35) | 27.0(1.06) |
| 16 | 1/2 | VFTA-SS-16M-8N | 49.2(1.94) | 19.8(0.78) | 12.0(0.47) | 27.0(1.06) |
| 18 | 3/4 | VFTA-SS-18M-12N | 52.4(2.06) | 20.6(0.81) | 14.0(0.55) | 32.0(1.26) |
| 20 | 1/2 | VFTA-SS-20M-8N | 50.0(1.97) | 19.8(0.78) | 15.5(0.61) | 27.0(1.06) |
| 20 | 3/4 | VFTA-SS-20M-12N | 57.2(2.25) | 20.6(0.81) | 15.5(0.61) | 35.0(1.38) |
| 25 | 1 | VFTA-SS-25M-16N | 66.7(2.63) | 25.4(1.00) | 19.8(0.78) | 41.0(1.61) |