TES-LOK brand | Female Thread on Run | Compression Tube on Run & Branch | SS 304 / SS 316 / Brass | 6000 PSI | ISO 9001:2015
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A female run tee tube fitting is a three-port instrumentation tee with a specific end configuration: one inline run end carries a female NPT, BSP, or BSPT thread that accepts a male-threaded stud, stem, or nipple already present on existing equipment; the opposite run end carries a double-ferrule compression tube connection; and the perpendicular branch port also carries a double-ferrule compression tube connection. It is the counterpart of the male run tee — where the male run tee screws into a port, the female run tee mounts onto a stud or nipple.
Tesco Steel manufactures female run tee tube fittings under the TES-LOK brand. They are used wherever a tube line must originate from a male-threaded equipment boss, transmitter outlet stud, valve stem, or hex nipple, and simultaneously continue as a tube run while branching to a second instrument — all in a single fitting. TES-LOK female run tees are dimensionally compatible with Swagelok, Parker A-LOK, and Ham-Let equivalents.
| Female Run Tee — Port Layout | ||
|---|---|---|
| Run End 1 (inline) | Female thread — NPT / BSP / BSPT / UNF / ISO / SAE | → Mounts onto male-threaded stud or nipple |
| Run End 2 (inline, opposite) | Compression tube — double-ferrule nut & ferrule set | → Connects to outgoing tube run |
| Branch End (perpendicular) | Compression tube — double-ferrule nut & ferrule set | → Connects to branch instrument tube |
| TES-LOK Female Run Tee Tube Fitting — Technical Data | |
|---|---|
| Brand | TES-LOK (Tesco Steel & Engineering) |
| Configuration | Female thread (run) × Compression tube (run) × Compression tube (branch) |
| Female Thread End | NPT / BSP / BSPT / UNF / ISO / SAE — one run end |
| Compression Ends | Double-ferrule (front ferrule + back ferrule) — run end 2 and branch |
| 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 |
Mounts directly onto a male-threaded equipment stud or nipple, continues the tube run, and branches to a second instrument — eliminating a separate female connector plus union tee combination.
Each port seals independently: tapered thread (NPT/BSPT) or face/bonded seal (BSP) on the female thread end; metal-to-metal double-ferrule compression on each tube end.
Both compression tube ends can be disconnected and re-made independently — initial make-up 1¼ turns; re-make ¼ turn — without disturbing the female thread seal on the stud.
Replaces a female connector + union tee + extra tube section with a single body — reducing potential leak paths, installation complexity, and system footprint on instrument panels.
Dimensionally interchangeable with Swagelok, Parker A-LOK, and Ham-Let female run tees — direct drop-in replacement with no system modification required.
SS 316 for chloride and marine service; Hastelloy C-276 and Monel 400 for H₂S, strong acids, and aggressive process media in chemical and offshore plant environments.
| Fitting Type | Run End 1 | Run End 2 | Branch End | Best Use |
|---|---|---|---|---|
| Female Run Tee | Female thread | Compression tube | Compression tube | Tube line originates at a male-threaded stud or nipple; branch to second tube instrument |
| Male Run Tee | Male thread | Compression tube | Compression tube | Tube line originates at a female-threaded port; branch to second tube instrument |
| Female Branch Tee | Compression tube | Compression tube | Female thread | Inline tube run with female-threaded branch accepting a male-threaded stud |
| Union Tee | Compression tube | Compression tube | Compression tube | All-tube T junction; no threaded ports, all three connections re-makeable |
| Female Connector | Female thread | Compression tube | — (2-port only) | Straight tube connection to a male-threaded stud; no branching capability |
| Tube OD (compression ends) | Female Thread (run end) | Typical Application |
|---|---|---|
| 1/4" | 1/8" NPT / 1/8" BSP | Mounting onto transmitter outlet stud; branch to local gauge |
| 1/4" | 1/4" NPT / 1/4" BSP | Hex nipple or equipment boss to dual tube instrument feed |
| 3/8" | 1/4" NPT / 1/4" BSP | Flow transmitter outlet stud to dual-instrument distribution |
| 3/8" | 3/8" NPT / 3/8" BSP | Larger equipment studs; dual 3/8" tube branching from single point |
| 1/2" | 1/2" NPT / 1/2" BSP | High-flow equipment stud to dual instrument or valve feed |
| 6 mm (metric) | 1/8" BSP | European panel instrument stud to dual metric-tube instruments |
| 10 mm (metric) | 1/4" BSP / 1/4" BSPT | Metric tube distribution from BSP equipment stud or nipple |
| 12 mm (metric) | 1/2" BSP / 1/2" BSPT | Larger metric-tube dual feed from BSP equipment boss |
Step 1 — Female thread end: Apply 2–3 PTFE tape wraps to the mating male NPT or BSPT stud or nipple before threading the fitting on. Thread the fitting onto the stud hand-tight, then tighten 1.5–2 wrench turns. For BSP parallel male studs with a bonded seal washer, the seal sits on the male end — tighten to the specified torque for the thread size; do not rely on thread engagement for the seal. Make the female thread connection first, before the compression tube ends, so you can apply wrench torque to the fitting body freely.
Step 2 — Compression tube ends (run and branch): Cut each tube square and deburr. Insert fully through the nut and ferrules until the tube bottoms in the body. Hand-tighten each nut. Mark the nut and turn an additional 1¼ turns for initial make-up — this swages both ferrules onto the tube OD. Both compression ends can be made up in sequence or simultaneously. Re-make: On subsequent disconnections, tighten only ¼ turn from hand-tight; the ferrules are already set onto the tube.
| Industry | Application | Preferred Material |
|---|---|---|
| Oil & Gas | Mounting onto male-threaded transmitter outlet studs or hex nipples while branching to a local pressure gauge; wellhead dual-instrument distribution from a single stud connection | SS 316, Monel, Inconel |
| Chemical & Petrochemical | Connecting to male-stud equipment nozzles and instrument bosses on reactors and columns while feeding dual analyzer instruments | SS 316L, Hastelloy C-276 |
| Power Generation | Boiler and turbine instrument connections from male-threaded equipment bosses and tapping studs; dual-gauge distribution from a single measurement point | SS 316, Carbon Steel |
| Semiconductor | Gas panel connections to male-threaded manifold studs with dual instrument distribution to mass flow controllers and pressure transducers | SS 316L EP (electropolished) |
| Food & Beverage | Hygienic dual-instrument branching from male-threaded valve stems on CIP-compatible process lines; dairy and beverage instrument panels | SS 316L (3-A certified) |
| Shipbuilding & Offshore | Hydraulic and pneumatic panel dual-gauge distribution from male-threaded block connections and deck instrument studs | SS 316, Cupro-Nickel |
ISO 9001:2015 certified | Female thread on run & compression tube branch | SS 304 · SS 316 · Brass · Alloys | NPT · BSP · BSPT | Fast global shipment
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