Black Elbows
Black elbows are malleable cast iron fittings with two female-threaded ends that turn a threaded black steel pipeline by 90 degrees. The short-radius body turns the line in a tight corner at wall bases and narrow shafts.
They are the most widely used threaded fitting in boiler rooms, radiator connections, indoor gas lines and compressor lines. Besides 10 sizes from 3/8″ to 4″, reducing and test-type elbows are also available.
Main Applications
- Heating lines turning at wall bases and corners
- Changes of direction at radiator and combi boiler connections
- Shaft and floor passages in indoor gas lines (in projects compliant with regulations)
- Compressor outlets and compressed air distribution
- Threaded turns in pump suction and discharge lines
- Pipe routes under machines and workbenches
Technical Data
| Fitting type | 90° elbow, two female-threaded ends |
|---|---|
| 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 |
| Sizes | 3/8″, 1/2″, 3/4″, 1″, 1 1/4″, 1 1/2″, 2″, 2 1/2″, 3″, 4″ (product range) |
| Other types | Reducing elbow and test elbow (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) |
| 45° turn | With a black 45° elbow |
| Type with one male end | With a black street elbow |
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? Black elbows last long in heating circuits without oxygen ingress and in gas lines; in lines constantly taking in fresh water a galvanized elbow is the better choice.
Advantages
Turns in Tight Spaces
- The short body saves space at corners and shaft passages
Range of Options
- Equal, reducing and test-type elbows
- A complete route together with 45° and street elbows
High Temperature
- Rated 20 bar at +300 °C at boiler outlets
Paintable Surface
- Same colour as black pipe, finished with a single coat of paint after installation
Construction and Design Features
- Two female-threaded ends on perpendicular axes
- Reducing type combines the turn with a size reduction
- Test elbow with an additional port for measuring or draining (depending on model)
- Design A body, EN 10242 pressure ratings
Send the elbow size, both sizes if reducing, and the quantity; we will confirm suitable black elbows from stock.
How to Choose?
- Determine the pipe sizeMeasure the size of both pipes in inches; if they differ, choose a reducing elbow.
- Choose the angleUse a 90° elbow for a sharp corner and a 45° elbow for a smoother turn.
- Check the end typeIf equipment connects directly to one end, a street elbow eliminates the extra nipple.
- Verify pressure and temperatureCompare the operating values of the line with the EN 10242 limits.
Complementary Products
Why ORFA?
Other Threaded Black Fittings
Threaded Black Tees
Threaded black tees are equal-size fittings used to split flow in three directions on threaded black steel pipelines.
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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 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.
Details →
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.