Black Street Elbows
A black street elbow is a 90° malleable cast iron elbow with one female-threaded end and one male-threaded end. The male-threaded spigot screws directly into a valve, fitting or equipment; no intermediate nipple is needed.
It is used to turn the line by the shortest route at radiator, boiler and appliance connections. It is supplied in 10 sizes from 3/8″ to 4″ with a black surface suitable for heating, gas and compressed air lines.
Main Applications
- Short turns at radiator and panel connections
- Changing direction directly at a valve outlet
- Tight connections around boilers and burners
- Gas appliance connections (in projects compliant with regulations)
- Compressed air appliance outlets
- Connections to female-threaded ports on machines
Technical Data
| Fitting type | 90° street elbow |
|---|---|
| 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 | One end ISO 7-1 Rp female, one end R taper male |
| 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) |
| Angle | 90° |
| Type with two female ends | With a black elbow |
| Installation | 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), depending on model |
| Surface | Black, uncoated | Zinc coated | Stainless, uncoated |
| Thread | ISO 7-1 Rp female + R male | ISO 7-1 Rp female + R male | 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 street elbow is sufficient in closed systems such as radiator and boiler circuits; a galvanized street elbow should be preferred in domestic water installations.
Advantages
Nipple-Free Installation
- The male spigot eliminates the intermediate piece
- One less sealing point
Short Connection Length
- Direction changes right after the appliance port
Faster Labour
- Fewer parts, less thread wrapping
Wide Size Range
- 10 sizes from 3/8″ to 4″
Construction and Design Features
- Female-threaded end and male spigot at right angles
- The R taper spigot seats directly into an Rp female-threaded part
- One-piece cast body
- TS EN 10242 design A
Send the street elbow size and quantity; we will also assess whether a standard elbow is needed at the connection point.
How to Choose?
- Check the connection endsIf one side is female-threaded equipment or a fitting, choose a street elbow; if both sides are pipe, a standard elbow.
- Measure the sizeThe spigot and the female end are the same size; add a reducer for a different size.
- Plan the orientationThe elbow turns as the spigot is screwed in; make sure the female end faces the target direction in its final position.
- Choose the surfaceUse black fittings in closed circuits and galvanized fittings for drinking water.
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Why ORFA?
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Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.