TES-LOK brand | Compression Tube Run-Through | Male Thread on Branch | SS 304 / SS 316 / Brass | 6000 PSI | ISO 9001:2015
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A male branch tee tube fitting is a three-port instrumentation tee where both inline run ends carry double-ferrule compression tube connections and the perpendicular branch port carries a male NPT, BSP, or BSPT thread that screws directly into a female-threaded instrument port, pressure gauge, transmitter inlet, or valve body. The tube run passes straight through the fitting uninterrupted; the male-threaded branch provides a direct, no-adapter tap point to any female-threaded instrument alongside the line.
Tesco Steel manufactures male branch tee tube fittings under the TES-LOK brand. They are one of the most common mid-run instrument connection fittings in process plant instrumentation — wherever a tube impulse line must continue straight through while also delivering process pressure or flow signal to a local gauge, transmitter, or manifold port. TES-LOK male branch tees are dimensionally compatible with Swagelok, Parker A-LOK, and Ham-Let equivalents.
| Male Branch Tee — Port Layout | ||
|---|---|---|
| Run End 1 (inline) | Compression tube — double-ferrule nut & ferrule set | → Incoming tube run |
| Run End 2 (inline, opposite) | Compression tube — double-ferrule nut & ferrule set | → Continuing tube run (line passes through) |
| Branch End (perpendicular) | Male thread — NPT / BSP / BSPT / UNF / ISO / SAE | → Screws into female-threaded instrument port |
| TES-LOK Male Branch Tee Tube Fitting — Technical Data | |
|---|---|
| Brand | TES-LOK (Tesco Steel & Engineering) |
| Configuration | Compression tube (run) × Compression tube (run) × Male thread (branch) |
| Run Ends | Double-ferrule compression (front ferrule + back ferrule) — both inline ends |
| Branch End | Male NPT / BSP / BSPT / UNF / ISO / SAE thread |
| 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 |
| 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 |
| Surface Finish | Electropolished / Passivated / As-machined |
| Certifications | ISO 9001:2015; NABL-traceable MTRs available |
The tube run passes straight through both compression ends; the male-threaded branch provides a direct instrument tap — no break in the main line, no additional union or adapter required.
Male branch thread screws directly into pressure gauges, transmitters, manifold ports, and valve bodies — eliminating the male connector and tube section that would otherwise bridge a union tee to the instrument.
Each port seals independently: metal-to-metal double-ferrule compression on each run end; tapered thread (NPT/BSPT) or face seal (BSP) on the male branch end.
Both compression run ends can be disconnected and re-made independently — initial make-up 1¼ turns; re-make ¼ turn — without disturbing the branch instrument connection.
Dimensionally interchangeable with Swagelok, Parker A-LOK, and Ham-Let male branch tees — direct drop-in replacement with no system modification required.
SS 316 for chloride and marine environments; Hastelloy C-276 and Monel 400 for H₂S, strong acids, and aggressive process media in offshore and chemical plant service.
| Fitting Type | Run End 1 | Run End 2 | Branch End | Best Use |
|---|---|---|---|---|
| Male Branch Tee | Compression tube | Compression tube | Male thread | Tube run passes through; branch taps directly into female-threaded instrument port |
| Male Run Tee | Male thread | Compression tube | Compression tube | Tube line originates at female-threaded port; branch to second tube instrument |
| Union Tee | Compression tube | Compression tube | Compression tube | All-tube T junction; branch connects to a third tube, not a threaded port |
| Female Branch Tee | Compression tube | Compression tube | Female thread | Tube run passes through; branch mounts onto a male-threaded stud or nipple |
| Male Connector | Compression tube | Male thread | — (2-port only) | Straight tube connection to female-threaded port; no run-through or branching |
| Tube OD (run ends) | Male Thread (branch) | Typical Application |
|---|---|---|
| 1/4" | 1/8" NPT / 1/8" BSP | Mid-run tap to pressure gauge or small transmitter inlet |
| 1/4" | 1/4" NPT / 1/4" BSP | Impulse line tap to pressure transmitter or manifold port |
| 3/8" | 1/4" NPT / 1/4" BSP | Flow transmitter impulse line tap to secondary gauge |
| 3/8" | 3/8" NPT / 3/8" BSP | Mid-run tap to larger gauge or control valve actuator port |
| 1/2" | 1/2" NPT / 1/2" BSP | High-flow process line tap to transmitter or valve instrument port |
| 6 mm (metric) | 1/8" BSP | European panel impulse line tap to BSP instrument port |
| 10 mm (metric) | 1/4" BSP / 1/4" BSPT | Metric tube run tap to BSP instrument or valve port |
| 12 mm (metric) | 1/2" BSP / 1/2" BSPT | Larger metric tube line tap to BSP transmitter or manifold port |
Step 1 — Compression run ends: Cut both tubes square and deburr. Insert each tube fully through its nut and ferrules until the tube bottoms in the fitting body. Hand-tighten each nut. Mark the nut position and turn an additional 1¼ turns for initial make-up — this swages the double ferrules onto each tube OD. Both run ends can be made up in sequence or simultaneously. Making up the run ends first stabilises the fitting body before the branch is tightened.
Step 2 — Male branch thread: Apply 2–3 PTFE tape wraps clockwise to NPT or BSPT threads, thread into the female instrument port hand-tight, then add 1.5–2 wrench turns. For BSP parallel (BSPP) threads, use a bonded seal washer — no PTFE tape. Hold the fitting body with a back-up wrench to avoid twisting torque into the already-made-up compression run ends. Re-make of compression ends: ¼ turn from hand-tight only — ferrules are already set.
| Industry | Application | Preferred Material |
|---|---|---|
| Oil & Gas | Mid-run taps on pressure transmitter impulse lines to connect local pressure gauges; wellhead and separator instrument branching without breaking the main impulse line | SS 316, Monel, Inconel |
| Chemical & Petrochemical | Inline analyzer sample line taps to instrument port connections on corrosive-service reactors and columns; mid-run process taps to pressure and temperature transmitters | SS 316L, Hastelloy C-276 |
| Power Generation | Boiler and steam line mid-run instrument taps where the impulse line must continue to a second instrument while branching to a local gauge or transmitter port | SS 316, Carbon Steel |
| Semiconductor | Gas panel mid-line taps from process gas tubing to pressure transducer ports; MFC outlet line taps to downstream pressure monitoring instruments | SS 316L EP (electropolished) |
| Food & Beverage | Mid-run pressure and temperature instrument taps on CIP-compatible process tubing; dairy and beverage line instrument connections without flow interruption | SS 316L (3-A certified) |
| Shipbuilding & Offshore | Hydraulic and pneumatic panel mid-line gauge taps; deck instrument distribution where the main tube line must remain continuous | SS 316, Cupro-Nickel |
ISO 9001:2015 certified | Compression tube run-through & male thread branch | SS 304 · SS 316 · Brass · Alloys | NPT · BSP · BSPT | Fast global shipment
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