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The Straight Union (Fractional Tube) is a fundamental instrumentation fitting designed to provide a secure, leak-proof connection between two pieces of fractional-sized tubing of the same diameter. Engineered with a twin-ferrule compression system, it ensures a robust mechanical grip that withstands high pressure, vacuum, and thermal cycling without compromising the integrity of the fluid system. These unions are typically manufactured from high-grade 316 stainless steel or brass, making them ideal for a wide range of industrial applications—from laboratory gas lines to large-scale chemical processing—where a reliable, torque-free assembly is essential for maintaining a continuous, uninterrupted flow path.
| UNION | ||||||
|---|---|---|---|---|---|---|
| Fractional Tube | ||||||
| T-Tube O.D. (in.) | Basic Ordering Number | Dimensions in (mm) | ||||
| L | C | E | G | F | ||
| 1/16 | VU-SS-1 | 0.99(25.1) | 0.34(8.6) | 0.31(7.9) | 0.31(7.9) | 0.05(1.3) |
| 1/8 | VU-SS-2 | 1.40(35.6) | 0.50(12.7) | 0.44(11.1) | 0.44(11.1) | 0.09(2.3) |
| 3/16 | VU-SS-3 | 1.47(37.3) | 0.54(13.7) | 0.50(12.7) | 0.50(12.7) | 0.12(3.0) |
| 1/4 | VU-SS-4 | 1.61(40.9) | 0.60(15.2) | 0.56(14.3) | 0.50(12.7) | 0.19(4.8) |
| 5/16 | VU-SS-5 | 1.69(42.9) | 0.64(16.2) | 0.63(15.9) | 0.56(14.3) | 0.25(6.4) |
| 3/8 | VU-SS-6 | 1.77(45.0) | 0.66(16.8) | 0.69(17.5) | 0.63(15.9) | 0.28(7.1) |
| 1/2 | VU-SS-8 | 2.02(51.3) | 0.90(22.9) | 0.87(22.2) | 0.81(20.6) | 0.41(10.4) |
| 5/8 | VU-SS-10 | 2.05(52.1) | 0.96(24.4) | 1.00(25.4) | 0.94(23.9) | 0.50(12.7) |
| 3/4 | VU-SS-12 | 2.11(53.6) | 0.96(24.4) | 1.13(28.6) | 1.06(27.0) | 0.62(15.7) |
| 7/8 | VU-SS-14 | 2.19(55.7) | 1.02(25.9) | 1.25(31.8) | 1.19(30.2) | 0.72(18.3) |
| 1 | VU-SS-16 | 2.55(64.8) | 1.23(31.2) | 1.5(38.1) | 1.37(34.9) | 0.88(22.4) |
| 1 1/8 | VU-SS-18 | 3.47(88.2) | 1.44(36.7) | 1.75(44.5) | 1.63(41.3) | 0.97(24.6) |
| 1 1/4 | VU-SS-20 | 3.63(92.2) | 1.62(41.1) | 1.87(47.6) | 1.75(44.5) | 1.09(27.7) |
| 1 1/2 | VU-SS-24 | 4.25(108.0) | 1.97(50.0) | 2.25(57.2) | 2.13(54.0) | 1.34(34.0) |