Stainless Steel Nipples
A stainless nipple is a stainless fitting with male threads on both ends that connects two female-threaded parts, or a valve and a fitting. It is supplied in hex, double, reducing and pipe nipple types.
It is used to connect stainless valves, pumps, filters and instruments to the line. Besides hex and double nipples from 1/8″ to 4″, pipe nipples 10 and 15 cm long are also available.
Main Applications
- Stainless valve and check valve connections
- Pump and filter inlets and outlets
- Pressure gauge and sensor fittings
- Valve arrays on manifolds
- Transitions between female-threaded parts of different sizes
- Short pipe extensions (10–15 cm)
Technical Data
| Fitting types | Hex nipple, double nipple, reducing nipple, pipe nipple |
|---|---|
| Product standard | ISO 4144 (manufacturer sheet) |
| Material | AISI 304; AISI 316 option for reducing nipples (product range) |
| Thread | ISO 7-1 R taper male thread on both ends |
| Hex and double nipples | 1/8″ – 4″, 12 sizes (product range) |
| Reducing nipples | 1/4″ × 1/8″ – 2″ × 1 1/2″ (product range) |
| Pipe nipples | 1/2″, 3/4″, 1″, 2 1/2″; 10 or 15 cm long (product range) |
| Pressure, −20 … +38 °C | 20 bar (ISO 4144 Table 2, manufacturer sheet) |
| Pressure, 100 °C | 16.5 bar (ISO 4144 Table 2, manufacturer sheet) |
| Pressure, 150 °C | 15 bar (ISO 4144 Table 2, manufacturer sheet) |
| Connects to | Rp female-threaded fittings, valves and equipment |
| Surface | Stainless, uncoated |
Material Options
| Part | AISI 304 stainless | AISI 316 stainless | Galvanized malleable iron |
|---|---|---|---|
| Body | AISI 304, cast or bar depending on model | AISI 316, depending on model | Malleable iron EN-GJMB-350-10, galvanized |
| Surface | Uncoated stainless | Uncoated stainless | Zinc coated |
| Thread | ISO 7-1 R male thread | ISO 7-1 R male thread | ISO 7-1 R male thread |
| Pressure rating | 20 bar −20…+38 °C (ISO 4144) | 20 bar −20…+38 °C (ISO 4144) | 25 bar −20…120 °C (EN 10242) |
| Suitable media | Food, drinking water, mild chemicals | Chloride-containing water, seawater, aggressive chemicals | Cold domestic water, fire water |
Which material? When connecting a stainless valve or pump to the line, a stainless nipple prevents corrosion at the threads; grade 316 should be chosen in chloride environments.
Advantages
Four Different Types
- Hex, double, reducing and pipe nipples
Extension Without Cutting Pipe
- Short distances solved with 10–15 cm pipe nipples
Size Transition
- Reducing nipples bridge two female parts of different sizes
Uncoated Threads
- No risk of coating peeling at the threads
Construction and Design Features
- ISO 7-1 R taper male thread on both ends
- Wrench surface in the middle on the hex type
- Stainless pipe body of fixed length on pipe nipples
- ISO 4144 pressure ratings
Send the nipple type, size (both sizes for reducing, length for pipe nipples) and quantity; we will confirm the suitable stainless nipple from stock.
How to Choose?
- Measure the female threadsChoose a hex nipple if both sides are the same size, a reducing nipple if they differ.
- Determine the distanceUse a hex nipple if the parts are adjacent, a 10–15 cm pipe nipple if there is a gap.
- Choose the gradePrefer 304 for general use and 316 in chloride environments.
- Plan the thread sealingUse a suitable tape or sealant that reduces galling on stainless threads.
Complementary Products
Why ORFA?
Other Stainless Steel Threaded Fittings
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Stainless Steel Conical Unions
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Stainless Steel Street Elbows
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Stainless Steel Sockets
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Details →Get a quote for your project
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