TES-LOK brand | Panel Feed-Through Design | SS 304 / SS 316 / Brass | 6000 PSI | ISO 9001:2015
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A bulkhead union tube fitting is a compression tube fitting engineered to pass instrument tubing through a panel, wall, enclosure, or bulkhead barrier while maintaining a full union — re-makeable — connection on both sides. The fitting body is extended and threaded, accepting a hex panel locknut that clamps firmly against the inner face of the panel when tightened. Once the fitting is secured through the panel, tubing on either side connects via standard double-ferrule compression, exactly like a regular union.
This design is indispensable wherever instrument lines must transition between a classified (hazardous) area and a safe area — for example, from an outdoor offshore deck into an analyzer shelter, or from a process plant into a control room junction box. The Tesco Steel TES-LOK bulkhead union provides a gas-tight, high-pressure-rated penetration point that can be serviced, disconnected, and re-made on both sides without disturbing the panel installation.
| TES-LOK Bulkhead Union Tube Fitting — Technical Data | |
|---|---|
| Brand | TES-LOK (Tesco Steel & Engineering) |
| Fractional Sizes | 1/16" OD to 2" OD |
| Metric Sizes | 2 mm OD 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 Standards | NPT (ANSI/ASME B1.20.1), BSP (ISO 228), BSPT (ISO 7), UNF (ANSI/ASME B1.1), ISO, SAE |
| Pressure Rating — SS | Up to 6000 PSI (413 bar) |
| Pressure Rating — Brass | 300 PSI / 1000 PSI / 3000 PSI (size-dependent) |
| Temperature Range | 150 °C to 400 °C |
| Standards | ASTM D1710, ASTM D3294 |
| Mounting | Extended body with hex panel locknut; panel thickness typically 3–12 mm |
| Connection Type | Double-ferrule compression (both ends) |
| Surface Finish | Electropolished / Passivated / As-machined |
| Certifications | ISO 9001:2015; NABL-traceable MTRs available |
Extended body with hex locknut mounts securely through enclosure walls, junction boxes, and analyzer shelter panels.
Full union compression on both sides — disconnect and reconnect tubing independently on either face of the panel.
Metal-to-metal ferrule seat provides a gas-tight, pressure-rated seal — critical for hazardous-area / safe-area barriers.
Dimensionally interchangeable with Swagelok, Parker A-LOK, and Ham-Let bulkhead unions — direct drop-in replacement.
SS 316 with Mo addition for chloride and marine resistance; alloy grades for H₂S, acids, and high-temperature service.
NPT, BSP, BSPT, UNF, ISO, SAE — one manufacturer for every regional installation requirement.
| Fitting Type | Tube Connections | Serviceable Both Sides? | Primary Use |
|---|---|---|---|
| Bulkhead Union | Compression both ends | Yes — full union both sides | Inline, re-makeable panel penetration |
| Bulkhead Male Connector | Compression tube + male NPT/BSP | Tube side only | Connect tube to threaded port through panel |
| Female Bulkhead Connector | Compression tube + female NPT/BSP | Tube side only | Connect tube to female threaded port through panel |
| Standard Union | Compression both ends | Yes — but no panel mount | Inline disconnect in open runs |
| Fitting Type | Function |
|---|---|
| Union (Straight) | Inline re-makeable connection between equal-diameter tubes |
| Union Elbow | 90° directional change with union disconnection |
| Union Tee | T-branch with union ends on all three ports |
| Union Cross | Four-way junction with union connections |
| Bulkhead Union | Panel feed-through with union on both sides |
| Reducing Union | Inline connection between two different tube ODs |
| Socket Weld Union | Weld-end connection with serviceable union nut |
| AN Union Connector | Aerospace / AN-standard union connector |
| Industry | Application | Preferred Material |
|---|---|---|
| Oil & Gas | Analyzer shelter wall penetrations, safe-area junction box feed-throughs, offshore instrument panels | SS 316, Monel, Inconel |
| Chemical & Petrochemical | Enclosure feed-throughs for corrosive fluid instrument lines, classified-area barrier penetrations | SS 316L, Hastelloy C-276 |
| Power Generation | Control room panel tubing entries, boiler instrument lines through switchgear room walls | SS 316, Carbon Steel |
| Semiconductor | Gas cabinet wall penetrations for UHP process gases, clean-room panel feed-throughs | SS 316L EP |
| Shipbuilding & Offshore | Deck penetrations, machinery space instrument line feed-throughs, HVAC control panels | SS 316, Cupro-Nickel |
| Pharmaceutical | Clean-room and isolator enclosure tubing penetrations requiring hygienic re-makeability | SS 316L (3-A certified) |
ISO 9001:2015 certified | Panel feed-through design | SS 304 · SS 316 · Brass · Special Alloys | Fast global shipment
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