TES-LOK brand | 4-Way Compression on All Ports | SS 304 / SS 316 / Brass | 6000 PSI | ISO 9001:2015
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A union cross tube fitting is a four-port compression tube fitting arranged in a cross (+) configuration, with independent double-ferrule compression connections on all four ports. Two ports form an inline pair (the run) and two ports branch off at 90° in opposite directions — creating a single junction point where one tubing line can be split into three, three lines can merge into one, or four instrument lines can be interconnected in a compact manifold arrangement.
Also referred to as a 4-way union or union four-way fitting, the cross is less common than a union tee but essential wherever a fourth instrument connection is needed at the same junction. Tesco Steel manufactures union cross fittings under the TES-LOK brand, dimensionally compatible with Swagelok, Parker A-LOK, and Ham-Let equivalents. All four ports carry the same re-makeable double-ferrule design — disconnect and reconnect any port independently without disturbing the others.
| TES-LOK Union Cross Tube Fitting — Technical Data | |
|---|---|
| Brand | TES-LOK (Tesco Steel & Engineering) |
| Configuration | Equal cross (+) — all four ports same tube OD |
| Ports | 4 — two inline (run) + two lateral (branch) at 90° |
| Connection Type | Double-ferrule compression on all four ports |
| Fractional Tube OD | 1/16" to 2" OD |
| Metric Tube OD | 2 mm to 50 mm OD |
| Material Grades | SS 304 (1.4301), SS 316 (1.4401), Brass, Monel 400, Inconel 600, Hastelloy C-276, Titanium Gr. 2 |
| Thread (end connections) | NPT, BSP, BSPT, UNF, ISO, SAE (where applicable) |
| Pressure Rating — SS | Up to 6000 PSI (413 bar) — equal on all four ports |
| Pressure Rating — Brass | 300 PSI / 1000 PSI / 3000 PSI (size-dependent) |
| Temperature Range | 150 °C to 400 °C |
| Standards | ASTM D1710, ASTM D3294 |
| Surface Finish | Electropolished / Passivated / As-machined |
| Certifications | ISO 9001:2015; NABL-traceable MTRs available |
Split one instrument line to three destinations — or combine three lines at one point — without any additional tees, elbows, or adapters.
Each port has independent double-ferrule compression — disconnect, replace, or extend any single tube leg without disturbing the other three.
Replaces the equivalent of two tees plus connecting tubing — saving space and reducing leak points in dense instrument panel layouts.
Dimensionally interchangeable with Swagelok, Parker A-LOK, and Ham-Let union cross fittings — drop-in replacement.
SS 316 for chloride and marine service; Hastelloy C-276 and Monel 400 for acids, H₂S, and aggressive process media.
All four ports rated identically — up to 6000 PSI in SS — no de-rating for branch ports as with some manifold designs.
| Fitting Type | Ports | Connection Type | Re-makeable? | Best Use |
|---|---|---|---|---|
| Union Cross | 4 (+ shape) | Compression tube all ports | Yes — all 4 | Four-way tube-to-tube junction; calibration gas distribution |
| Union Tee | 3 (T shape) | Compression tube all ports | Yes — all 3 | Three-way tube junction; most common multi-port fitting |
| Female Cross | 4 (+ shape) | Female NPT/BSP all ports | With re-tape | Four-way threaded pipe junction |
| Branch Tee | 3 (T shape) | Compression + thread mix | Partial | Tube run with threaded branch off to instrument |
| 2× Union Tee + tubing | 4 (via 2 fittings) | Compression tube | Yes | Alternative — larger, more leak points, higher cost |
| Application | How the Cross is Used | Typical Material |
|---|---|---|
| Calibration Gas Distribution | Single calibration gas cylinder line splits to four analyzer inlets simultaneously — one cross instead of cascaded tees | SS 316 |
| Multi-Instrument Pressure Header | One process tapping feeds four pressure transmitters or gauges from a single junction point | SS 316, Monel |
| Heat Exchanger Monitoring | Tube-side outlet feeds temperature, pressure, flow, and sample instruments from one cross manifold | SS 316L |
| Pressure Test Manifolds | One test pump connection distributes pressure simultaneously to four instrument legs during loop calibration | SS 304, SS 316 |
| UHP Gas Panel Cross-Connection | Gas distribution network node connecting four sub-distribution legs in semiconductor fab gas cabinets | SS 316L EP |
| Hydraulic Test Panels | Cross-connects four hydraulic sensing lines at a manifold point for simultaneous pressure monitoring | SS 316, Brass |
| Industry | Application | Preferred Material |
|---|---|---|
| Oil & Gas | Multi-analyzer sample headers, wellhead pressure test manifolds, calibration gas distribution racks | SS 316, Monel, Inconel |
| Chemical & Petrochemical | Process analyzer distribution, four-way instrument tapping headers on corrosive service | SS 316L, Hastelloy C-276 |
| Power Generation | Heat exchanger instrument manifolds, boiler water chemistry four-point monitoring loops | SS 316 |
| Semiconductor | UHP gas distribution cross-connections, process gas sub-panel four-way nodes | SS 316L EP |
| Shipbuilding & Offshore | Hydraulic panel cross-connections, deck instrument manifolds requiring four-way distribution | SS 316, Cupro-Nickel |
| Laboratory & Research | Experimental flow rigs, multi-point pressure distribution in test setups | SS 316, Brass |
ISO 9001:2015 certified | 4-way compression all ports | SS 304 · SS 316 · Brass · Special Alloys | Fast global shipment
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