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The Bulkhead Union (Fractional Tube) is a robust instrumentation fitting designed to provide a secure, leak-proof connection for fractional-sized tubing while passing through walls, panels, or bulkheads. Featuring an extended threaded body and a dedicated bulkhead nut, it allows for a rigid, vibration-resistant mount that protects the tubing from mechanical stress and ensures stability at the point of penetration. This fitting utilizes a high-precision double-ferrule compression system on both ends to provide a torque-free, gastight seal capable of withstanding high-pressure and vacuum conditions. It is a critical component in control panel assemblies and industrial enclosures, where it facilitates a professional, organized transition between external and internal fluid lines while maintaining the structural integrity of the system.
| BULKHEAD UNION | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Metric Tube | Dimensions mm (in) | Panel Hole Size in. (mm) |
Max. Panel Thickness |
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| T-Tube O.D. (mm.) |
Basic Ordering Number |
L | C | E | G | F | Gx | |||
| 3 | VBU-SS-3M | 51.3(2.02) | 12.9(0.51) | 2.4(0.09) | 12.0(0.47) | 14.0(0.55) | 14.0(0.55) | 8.3(0.33) | 12.7(0.50) | |
| 4 | VBU-SS-4M | 53.6(2.11) | 13.7(0.54) | 2.4(0.09) | 12.0(0.47) | 14.0(0.55) | 14.0(0.55) | 9.9(0.39) | 12.7(0.50) | |
| 6 | VBU-SS-6M | 57.7(2.27) | 15.3(0.60) | 4.8(0.19) | 14.0(0.55) | 16.0(0.63) | 16.0(0.63) | 11.5(0.45) | 10.2(0.40) | |
| 8 | VBU-SS-8M | 61.0(2.40) | 16.2(0.64) | 6.4(0.25) | 16.0(0.63) | 18.0(0.71) | 18.0(0.71) | 13.1(0.52) | 11.2(0.44) | |
| 10 | VBU-SS-10M | 63.7(2.51) | 17.2(0.68) | 7.9(0.31) | 19.0(0.75) | 22.0(0.87) | 22.0(0.87) | 16.3(0.64) | 11.2(0.44) | |
| 12 | VBU-SS-12M | 71.0(2.80) | 22.8(0.90) | 9.5(0.37) | 22.0(0.87) | 24.0(0.94) | 24.0(0.94) | 19.5(0.77) | 12.7(0.50) | |
| 14 | VBU-SS-14M | 72.5(2.85) | 24.4(0.96) | 11.1(0.44) | 25.0(0.98) | 27.0(1.06) | 27.0(1.06) | 22.5(0.89) | 12.7(0.50) | |
| 15 | VBU-SS-15M | 72.5(2.85) | 24.4(0.96) | 11.9(0.47) | 25.0(0.98) | 27.0(1.06) | 27.0(1.06) | 22.8(0.90) | 12.7(0.50) | |
| 16 | VBU-SS-16M | 72.5(2.85) | 24.4(0.96) | 12.7(0.50) | 25.0(0.98) | 27.0(1.06) | 27.0(1.06) | 22.8(0.90) | 12.7(0.50) | |
| 18 | VBU-SS-18M | 78.9(3.11) | 24.4(0.96) | 15.1(0.59) | 30.0(1.18) | 30.0(1.18) | 30.0(1.18) | 26.0(1.02) | 16.8(0.66) | |
| 20 | VBU-SS-20M | 84.5(3.33) | 26.0(1.02) | 15.9(0.63) | 32.0(1.26) | 35.0(1.38) | 35.0(1.38) | 29.0(1.14) | 19.0(0.75) | |
| 25 | VBU-SS-25M | 96.0(3.78) | 31.3(1.23) | 21.8(0.86) | 38.0(1.5) | 41.0(1.61) | 41.0(1.61) | 34.0(1.34) | 19.0(0.75) | |
| 30 | VBU-SS-30M | 124.0(4.88) | 39.6(1.56) | 26.2(1.03) | 50.0(1.97) | 50.0(1.97) | 50.0(1.97) | 40.5(1.59) | 19.0(0.75) | |
| 32 | VBU-SS-32M | 128.0(5.04) | 42.0(1.65) | 28.6(1.13) | 50.0(1.97) | 50.0(1.97) | 50.0(1.97) | 42.5(1.67) | 19.0(0.75) | |
| 38 | VBU-SS-38M | 145.0(5.71) | 49.4(1.94) | 33.7(1.33) | 60.0(2.36) | 60.0(2.36) | 60.0(2.36) | 50.5(1.99) | 19.0(0.75) | |