Black Nipples
A black nipple is a short malleable cast iron fitting with male threads on both ends, connecting two female-threaded parts or a valve and a fitting. The hexagon in the middle makes tightening with a wrench easier.
It is used to connect female-threaded equipment such as valves, strainers, pumps and meters to fittings without using pipe. It is supplied in 10 sizes from 3/8″ to 4″ for boiler room, gas and air lines.
Main Applications
- Short connections between a valve and an elbow, tee or socket
- Assembling strainer and check valve groups
- Spacers at pump and meter connections
- Valve arrays on manifolds
- Filter-regulator connections in compressed air lines
- Connections between valves and unions in gas lines (in projects compliant with regulations)
Technical Data
| Fitting type | Hexagon nipple, two male-threaded ends of 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 R taper male thread on both 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) |
| Connects to | Rp female-threaded fittings, valves and equipment |
| Between different sizes | With a black reducing bush |
| Installation | Thread sealing tape, hemp or anaerobic sealant |
Material Options
| Part | Black malleable iron | Galvanized malleable iron | Stainless steel |
|---|---|---|---|
| Body | Blackheart malleable cast iron B 350-10 | Malleable iron EN-GJMB-350-10, hot-dip galvanized | Stainless bar or casting, depending on model |
| Surface | Black, uncoated | Zinc coated | Stainless, uncoated |
| Thread | ISO 7-1 R male thread | ISO 7-1 R male 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? When connecting a brass or bronze valve to a black line the nipple can be black; galvanized nipples are preferred for drinking water lines and stainless nipples for corrosive media.
Advantages
Pipe-Free Connection
- No need to cut and thread pipe between two female-threaded parts
Easy Tightening
- The hexagon middle section is held with a wrench
Compact Assembly
- Valve, check valve and strainer are grouped side by side in a short length
Taper Thread
- The R taper thread seals tighter as it is screwed into the Rp female thread
Construction and Design Features
- ISO 7-1 R taper male thread on both ends
- Hexagon wrench surface in the middle
- One-piece cast body; no joints or welds
- TS EN 10242 design A
Send the nipple size and quantity; we will also prepare the reducing bushes needed for the valve or equipment connection.
How to Choose?
- Measure the female threads to connectBoth ends of the nipple are the same size; if the two threads differ, use a reducing bush.
- Consider the distancePrefer a nipple for short distances and a threaded pipe piece for longer ones.
- Check pressure and temperatureCompare the line values with the limits of 25 bar/120 °C and 20 bar/300 °C.
- Choose for the mediumUse black nipples in closed circuits and gas lines, galvanized nipples for drinking water.
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.
Details →
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.
Details →
Black Conical Unions
Black conical unions provide a tight, removable connection on threaded black steel pipes through a conical seat.
Details →
Black Plugs and Caps
Black plugs and caps are used to close the ends of threaded black steel pipes and fittings.
Details →
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.
Details →
Black Sockets
Black sockets are female threaded fittings that join two black steel pipes of the same size in a straight line.
Details →
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.