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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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Fractional Tube | Dimensions in (mm) | Panel Hole Size in. (mm) |
Max. Panel Thickness |
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| Tx-Tube O.D. (in.) |
Basic Ordering Number |
L | C | E | G | F | Gx | |||
| 1/16 | VBU-SS-1 | 1.24(31.5) | 0.34(8.6) | 0.05(1.3) | 0.31(7.9) | 0.31(7.9) | 0.31(7.9) | 0.20(5.2) | 0.12(3.0) | |
| 1/8 | VBU-SS-2 | 2.02(51.3) | 0.50(12.7) | 0.09(2.3) | 0.44(11.1) | 0.50(12.7) | 0.50(12.7) | 0.33(8.3) | 0.50(12.7) | |
| 3/16 | VBU-SS-3 | 2.11(53.6) | 0.54(13.7) | 0.12(3.0) | 0.50(12.7) | 0.56(14.3) | 0.56(14.3) | 0.39(9.9) | 0.50(12.7) | |
| 1/4 | VBU-SS-4 | 2.27(57.7) | 0.60(15.2) | 0.19(4.8) | 0.56(14.3) | 0.63(15.9) | 0.63(15.9) | 0.45(11.5) | 0.40(10.2) | |
| 5/16 | VBU-SS-5 | 2.39(60.7) | 0.64(16.3) | 0.25(6.4) | 0.63(15.9) | 0.69(17.5) | 0.69(17.5) | 0.52(13.1) | 0.44(11.2) | |
| 3/8 | VBU-SS-6 | 2.45(62.2) | 0.66(16.8) | 0.28(7.1) | 0.69(17.5) | 0.75(19.1) | 0.75(19.1) | 0.58(14.7) | 0.44(11.2) | |
| 1/2 | VBU-SS-8 | 2.80(71.1) | 0.90(22.9) | 0.41(10.4) | 0.87(22.2) | 0.94(23.8) | 0.94(23.8) | 0.76(19.4) | 0.50(12.7) | |
| 5/8 | VBU-SS-10 | 2.86(72.6) | 0.96(24.4) | 0.50(12.7) | 1.00(25.4) | 1.06(27.0) | 1.06(27.0) | 0.89(22.6) | 0.50(12.7) | |
| 3/4 | VBU-SS-12 | 3.11(79.0) | 0.96(24.4) | 0.62(15.7) | 1.13(28.6) | 1.19(30.2) | 1.19(30.2) | 1.02(25.8) | 0.66(16.8) | |
| 7/8 | VBU-SS-14 | 3.35(85.2) | 1.02(25.9) | 0.72(18.3) | 1.25(31.8) | 1.38(34.9) | 1.37(34.9) | 1.14(29.0) | 0.75(19.1) | |
| 1 | VBU-SS-16 | 3.77(95.8) | 1.23(31.2) | 0.88(22.4) | 1.50(38.1) | 1.63(41.3) | 1.63(41.3) | 1.33(33.7) | 0.75(19.1) | |
| 1 1/4 | VBU-SS-20 | 4.85(123.2) | 1.62(41.1) | 1.09(27.8) | 1.87(47.6) | 1.87(47.6) | 1.87(47.6) | 1.64(41.7) | 0.75(19.1) | |
| 1 1/2 | VBU-SS-24 | 5.48(139.2) | 1.97(50.0) | 1.34(34.0) | 2.25(57.2) | 2.25(57.2) | 2.25(57.2) | 1.95(49.6) | 0.75(19.1) | |