Threaded Black Tees
A threaded black tee is a malleable cast iron fitting with three female-threaded ends, used to take a branch of the same size from the main line. The body has no galvanized coating, so it completes the installation with the same surface as black steel pipe.
Manifold outlets, radiator risers, gas distribution branches and compressed air ring mains are where equal tees are used most. Fittings produced to TS EN 10242 design A are supplied in 10 sizes from 3/8″ to 4″.
Main Applications
- Boiler room manifold and distributor outlets
- Radiator riser and floor branches
- Apartment and appliance branches in indoor gas lines (in projects compliant with regulations)
- Machine outlets from compressed air ring mains
- Tapping points for pressure gauges, thermometers and air vents
- Threaded branch connections in fire lines
- By-pass lines in cooling water circuits
Technical Data
| Fitting type | Equal tee, all three ends the same size |
|---|---|
| Product standard | TS EN 10242, design symbol A (manufacturer information) |
| Material | Blackheart malleable cast iron B 350-10 (sales sheet information) |
| Surface | Black, without galvanized coating |
| Thread | ISO 7-1 Rp parallel female thread on all three ends |
| Sizes | 3/8″, 1/2″, 3/4″, 1″, 1 1/4″, 1 1/2″, 2″, 2 1/2″, 3″, 4″ (product range) |
| Permissible pressure | 25 bar, −20 … +120 °C (EN 10242, design A) |
| Pressure at high temperature | 20 bar, up to +300 °C (EN 10242, design A) |
| Leak test | At least 5 bar air or 20 bar water (sales sheet information) |
| Connected pipe | Threaded black steel pipe (R taper male thread) |
| Branch of a different size | With a black reducing tee |
| Installation | Screwed; thread sealing tape, hemp or anaerobic sealant |
Material Options
| Part | Black malleable iron | Galvanized malleable iron | Stainless steel casting |
|---|---|---|---|
| Body | Blackheart malleable cast iron B 350-10 | Malleable iron EN-GJMB-350-10, hot-dip galvanized | Investment casting 1.4408 (AISI 316 equivalent) or 1.4308 (AISI 304 equivalent) |
| Surface | Black, uncoated | Zinc coated | Stainless, uncoated |
| Thread | ISO 7-1 Rp female thread | ISO 7-1 Rp female thread | Depending on model |
| Pressure rating | 25 bar −20…120 °C, 20 bar 300 °C (EN 10242) | 25 bar −20…120 °C (EN 10242) | Depending on model |
| Suitable media | Closed heating water, gas, compressed air | Drinking and domestic water, fire water | Corrosive media and media requiring hygiene |
Which material? A black tee is sufficient in closed heating circuits and gas lines; if the branch carries fresh water choose a galvanized tee, and for chemical or food lines a stainless tee.
Advantages
Branch in One Piece
- A branch is taken from the main line without extra fittings
- Fewer pipe cuts and threading points
Heat-Resistant Body
- Rated 20 bar at +300 °C, usable at boiler outlets
Measuring Point
- A pressure gauge or thermometer connects directly to the tee outlet
Wide Size Choice
- 10 sizes from 3/8″ to 4″
- From small appliance connections to main risers
Construction and Design Features
- All three ends on the same axis and size; the branch leaves the main line at 90°
- Rp female threads seal tightly with R taper male-threaded pipe
- Uncoated cast surface can be painted after installation
- Body conforming to the TS EN 10242 design A pressure table
Send the tee size and quantity; if a branch of a different size is needed, we will also suggest the reducing tee option.
How to Choose?
- Measure the main line sizeAll three ends of the tee are the same size; determine the main pipe size in inches.
- Check the branch sizeIf the branch is smaller, use a reducing tee or a tee plus reducer instead of an equal tee.
- Compare line conditionsCompare operating pressure and temperature with the limits of 25 bar/120 °C and 20 bar/300 °C.
- Choose the surface for the mediumPrefer black tees in closed circuits and galvanized tees for drinking water.
Complementary Products
Why ORFA?
Other Threaded Black Fittings
Black 45° Elbows
Black 45° elbows are fittings used to change direction by 45 degrees on threaded black steel pipelines.
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Black Pipe Crossover Bends
Black pipe crossover bends are curved fittings used to pass over another pipe on threaded black steel lines.
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Black Unions
Black unions are fittings that join two threaded black steel pipes in a way that can be taken apart again.
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Black Elbows
Black elbows are fittings used to change direction by 90 degrees on threaded black steel pipelines.
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Black Reducing Tees
Black reducing tees are fittings used to take a smaller branch off the main run on threaded black steel lines.
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Black Conical Unions
Black conical unions provide a tight, removable connection on threaded black steel pipes through a conical seat.
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Black Plugs and Caps
Black plugs and caps are used to close the ends of threaded black steel pipes and fittings.
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Black Crosses
Black crosses are fittings that split flow in four directions on threaded black steel pipelines.
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Black Street Elbows
Black street elbows have one female and one male threaded end and change direction on black steel lines without an extra nipple.
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Black Reducing Sockets
Black reducing sockets are female threaded fittings that join two black steel pipes of different sizes.
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Black Sockets
Black sockets are female threaded fittings that join two black steel pipes of the same size in a straight line.
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Black Nipples
Black nipples are short black steel pieces with male threads on both ends, used to connect two female threaded fittings.
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Black Reducing Bushes
Black reducing bushes are fittings with male and female threads used to change pipe size on threaded black steel lines.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.