Black 45° Elbows
A black 45° elbow is a malleable cast iron fitting with two female-threaded ends that turns a threaded black steel line by 45°. It gives a smoother turn than a 90° elbow and reduces flow resistance.
It is used for line offsets with two 45° elbows, sloped routes and passing obstacles. The store stocks the 1″ size; ask for stock of other sizes.
Main Applications
- Line offsets with two 45° elbows
- Sloped pipe routes
- Passing beams, ducts and other pipes
- Smooth-turn connections in boiler rooms
- Low-loss turns in compressed air lines
- Route corrections in indoor gas lines (in projects compliant with regulations)
Technical Data
| Fitting type | 45° 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 |
| Size in stock | 1″ (product range) |
| Other sizes | Depending on model, please ask |
| 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) |
| 90° turn | 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 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? For offsets on black lines a black 45° elbow keeps the surface uniform; use a galvanized 45° elbow on galvanized lines.
Advantages
Smooth Turn
- Less flow resistance than a 90° elbow
Easy Offset
- Two 45° elbows shift the line in parallel
Passing Obstacles
- Short route past beams and ducts
Heat Resistance
- Rated 20 bar at +300 °C
Construction and Design Features
- 45° angle between two female-threaded ends
- One-piece cast body
- Rp female threads fit R taper male-threaded pipe
- TS EN 10242 design A
Send the size and quantity you need; we will confirm stock and lead time for sizes other than 1″.
How to Choose?
- Determine the angleUse a 90° elbow for a sharp corner and a 45° elbow for smooth turns and offsets.
- Measure the sizeDetermine the pipe size in inches; ask for stock of sizes other than 1″.
- Plan the offset distanceThe pipe length between two 45° elbows sets the amount of offset.
- Check pressure and temperatureIf the offset line runs above 120 °C, take 20 bar as the pressure limit.
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Why ORFA?
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