TES-LOK Male Tee Tube Fittings — male NPT/BSP external thread on all three ports. Join three female-threaded components in a T-configuration without tube compression ends. SS 304 · SS 316 · Brass · Alloy 400 · Equal and Reducing · 6,000 PSI · ISO 9001:2015 certified.
A male tee tube fitting is a T-shaped three-port fitting with male external threads on all three ports — two inline run ports and one perpendicular branch port. Unlike hybrid tee fittings (male run tee, male branch tee) that combine tube compression ends with a single threaded port, the male tee has no compression ends at all — every port screws directly into a female-threaded socket, valve, manifold entry, or female connector.
The TES-LOK Male Tee is machined from bar stock or drop-forged blanks to precise thread-class tolerances. Equal-configuration male tees carry the same thread size on all three ports; reducing-configuration male tees use a smaller thread on the branch port. This makes the male tee the most compact and lowest-profile way to create a T-junction between three female-threaded components on an instrument skid or process header.
Because there are no tube stubs or ferrule shoulders, the male tee presents a smaller outside envelope than any hybrid tee variant, and installation requires only a thread sealant and two wrenches — no tube cutting, deburring, or ferrule set-up. Maximum working pressure is 6,000 PSI in SS 316 at ambient temperature, and all materials are supplied with full Mill Test Certificates.
| Port | Connection Type | Function |
|---|---|---|
| Run Port 1 (inline) | Male thread (NPT / BSP) | Screws into female-threaded fitting, valve, or manifold entry |
| Run Port 2 (opposite inline) | Male thread (NPT / BSP) | Screws into female-threaded fitting, valve, or manifold entry |
| Branch Port (perpendicular) | Male thread (NPT / BSP) | Screws into female-threaded instrument body, gauge socket, or female connector |
All three ports are interchangeable in the equal configuration. For reducing male tees, the branch port carries a smaller thread size than the two run ports. Compare with the Male Branch Tee (compression tube on both run ends, male thread only on branch) or the Female Tee (female thread on all three ports).
| Parameter | Details |
|---|---|
| Product name | Male Tee Tube Fitting |
| Brand | TES-LOK (Tesco Steel & Engineering) |
| Connection type — all ports | Male external thread — NPT, BSP tapered (BSPT), BSP parallel (BSPP), UNF, ISO metric, SAE/JIC |
| Configuration | Equal (all three ports same size) · Reducing (branch one size smaller than run) |
| Thread size range | 1/8" to 1" (NPT / BSP) · ISO metric M10 to M42 |
| Max working pressure | Up to 6,000 PSI (SS 316, ambient temperature) |
| Materials | SS 304, SS 316, SS 316L, Brass, Alloy 400 (Monel), Alloy 600 (Inconel), Alloy C-276 (Hastelloy), Duplex 2205, Super Duplex 2507 |
| Temperature range | −65 °F to +1200 °F (material dependent) |
| Thread standard | ANSI/ASME B1.20.1 (NPT) · BS EN 10226 / ISO 7 (BSP tapered) · ISO 228 (BSPP) |
| Quality certification | ISO 9001:2015 · Material test certificates · 3.1 / 3.2 MTCs on request |
| Finish | Bright machined (SS) · Electropolished on request · Nickel-plated (Brass) |
| Industries | Oil & Gas · Petrochemical · Power · Hydraulics · Marine · Pharma |
| Run Thread Size | Branch Thread Size | Configuration | Common Application |
|---|---|---|---|
| 1/8" NPT(M) | 1/8" NPT(M) | Equal | Miniature instrument manifolds, gauge headers |
| 1/4" NPT(M) | 1/4" NPT(M) | Equal | Pressure gauge T-junctions, transmitter manifolds |
| 1/4" NPT(M) | 1/8" NPT(M) | Reducing branch | Main line 1/4"; branch to smaller instrument port |
| 3/8" NPT(M) | 3/8" NPT(M) | Equal | Process skid hydraulic headers |
| 3/8" NPT(M) | 1/4" NPT(M) | Reducing branch | 3/8" run with 1/4" instrument tap |
| 1/2" NPT(M) | 1/2" NPT(M) | Equal | High-flow process headers, pneumatic distribution |
| 1/4" BSP(M) | 1/4" BSP(M) | Equal | Offshore metric instrument loops |
| 1/2" BSP(M) | 1/4" BSP(M) | Reducing branch | Marine hydraulic headers with instrument tap |
All three ports are male-threaded, so the fitting screws directly into any three female-threaded components — valve bodies, manifold entries, gauge sockets, female connectors — without the need for additional adapters, nipples, or intermediate pieces. One fitting replaces three separate threaded adapters.
Unlike compression-type tee fittings, the male tee has no tube stubs or ferrule seats. Installation requires only PTFE sealant and a wrench — no tube cutting, deburring, or ferrule make-up. This reduces installation time and eliminates the risk of ferrule damage from improper tube preparation.
Without ferrule shoulders or tube stubs, the male tee body is significantly shorter and lighter than any hybrid tee variant of the same port size. This is critical in congested instrument panels, compact skids, and densely packed analyser sample systems where space is at a premium.
TES-LOK Male Tees are available in equal configuration (same thread size on all three ports) and reducing configuration (branch one or two sizes smaller than the run). Reducing male tees eliminate a separate reducer fitting, cutting component count and potential leak points by one fitting per T-junction.
Machined from the same bar stock and forged blanks as TES-LOK's compression-type fittings, the male tee achieves up to 6,000 PSI working pressure. The all-metal construction handles cryogenic to high-temperature service without elastomers — making it suitable for steam, cryogenic, and high-temperature process applications.
Available in SS 304, SS 316, SS 316L, Brass, Monel 400, Inconel 600, Hastelloy C-276, Duplex 2205, and Super Duplex 2507. Each alloy is fully certified with Mill Test Certificates; 3.1 and 3.2 EN 10204 MTCs are available on request for critical or nuclear-class applications.
| Fitting | Run Port 1 | Run Port 2 | Branch Port | When to Choose |
|---|---|---|---|---|
| Male Tee | Male thread | Male thread | Male thread | All three mating parts are female-threaded |
| Female Tee | Female thread | Female thread | Female thread | All three mating parts are male-threaded |
| Male Branch Tee | Compression tube | Compression tube | Male thread | Tube run passes through; branch into female instrument port |
| Male Run Tee | Male thread | Compression tube | Compression tube | Thread on one run end; other run end and branch are compression tube |
| Union Tee | Compression tube | Compression tube | Compression tube | All-compression T-junction; no threaded ports |
Step 1 — Inspect threads. Check the male threads on the fitting and the female threads on the mating components for damage, burrs, or contamination. Clean with a lint-free cloth. Do not use the fitting if any thread is cross-threaded or stripped.
Step 2 — Apply thread sealant. For NPT and BSPT (tapered) threads: apply 2–3 wraps of PTFE tape clockwise starting from the first complete thread, or use an approved anaerobic pipe sealant. For BSPP/G (parallel) threads: do not use PTFE tape — use a bonded seal washer or O-ring face seal to achieve a leak-free joint.
Step 3 — Thread the first port. Hand-thread one port into its female mating socket until snug. Using a wrench on the adjacent body flat, tighten 1½ to 2 full turns past hand-tight for NPT/BSPT. Always apply a back-up wrench to the body hex closest to the port being tightened — never torque across the fitting body, as this stresses the perpendicular ports.
Step 4 — Thread the remaining ports. Repeat for the other two ports in sequence, using the nearest body flat each time. Tighten to the same engagement: hand-tight + 1½–2 turns. Check all three ports for correct alignment with their mating components before final torque.
Step 5 — Leak test. Pressurise the system to working pressure and inspect all three joints with a calibrated sniffer or bubble solution. Any weeping joint should be disassembled, cleaned, re-taped, and retightened — do not over-torque to stop a leak.
| Industry | Typical Application |
|---|---|
| Oil & Gas | Wellhead instrument manifold headers, chemical injection T-junctions, subsea control module piping |
| Refinery / Petrochemical | Analyser sample headers, reactor feed distribution manifolds, DCS instrument piping |
| Power Generation | Steam impulse pipe T-junctions, boiler drum gauge headers, turbine lube oil distribution |
| Hydraulics & Pneumatics | T-junction points in hydraulic power units, pneumatic control panel headers, accumulator piping |
| Marine & Offshore | Deck piping T-points, HVAC distribution manifolds, bilge pump headers |
| Chemical & Pharma | Chemical dosing manifold T-junctions, CIP/SIP distribution, sterile process piping |
▶ What is a male tee tube fitting?
▶ How does a male tee differ from a male branch tee or male run tee?
▶ How does a male tee differ from a female tee?
▶ What thread standards are available?
▶ What thread sizes are available?
▶ What is the maximum pressure rating?
▶ How do I install a male tee tube fitting?
▶ Which industries use male tee tube fittings?
ISO 9001:2015 certified manufacturer. SS 304 · SS 316 · Brass · Special Alloys. 1/8"–1" thread. NPT / BSP / BSPT. Equal and Reducing. Short lead times. Mill test certificates included.
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