Stainless Steel Threaded Fittings
Stainless threaded fittings are pipe fittings produced by investment casting from AISI 304 or AISI 316 stainless steel and screwed onto pipes. The body needs no coating; corrosion resistance comes from the material itself.
Food and beverage, chemical, pharmaceutical, cosmetics and marine installations are the main uses of stainless threaded fittings. Elbows, tees, sockets, nipples, reducers and unions produced to ISO 4144 are supplied from 1/8″ to 4″.
Main Applications
- Food, dairy and beverage production lines
- Chemical and petrochemical process lines
- Pharmaceutical and cosmetics plants
- Installations in seawater and saline environments
- Treatment plants and water conditioning lines
- Compressed air and gas sampling lines
- Laboratory and instrument connections
Technical Data
| Product standard | ISO 4144 (manufacturer sheet) |
|---|---|
| Material | AISI 304 or AISI 316 stainless steel (product range) |
| Production method | Investment casting (depending on model) |
| Thread standard | ISO 7-1: R taper male thread, Rp parallel female thread |
| Union nut thread | ISO 228-1 (depending on model) |
| Size range | 1/8″ – 4″ (product range) |
| Reducing fittings | Reducers and reducing nipples up to 4″ × 3″ (product range) |
| Pressure, −20 … +38 °C | 20 bar (290 psi) (ISO 4144 Table 2, manufacturer sheet) |
| Pressure, 100 °C | 16.5 bar (239 psi) (ISO 4144 Table 2, manufacturer sheet) |
| Pressure, 150 °C | 15 bar (218 psi) (ISO 4144 Table 2, manufacturer sheet) |
| Fitting types | Elbow, street elbow, tee, cross, socket, nipple, reducer, plug and cap, taper seat union, hose union |
| Surface | Stainless, uncoated |
Material Options
| Part | AISI 304 stainless | AISI 316 stainless | Galvanized malleable iron |
|---|---|---|---|
| Body | Stainless steel AISI 304 (cast equivalent 1.4308 / CF8, depending on model) | Stainless steel AISI 316 (cast equivalent 1.4408 / CF8M, depending on model) | Malleable iron EN-GJMB-350-10, hot-dip galvanized |
| Surface | Uncoated stainless | Uncoated stainless | Zinc coated |
| Thread | ISO 7-1 R / Rp | ISO 7-1 R / Rp | ISO 7-1 R / Rp |
| 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? AISI 304 is sufficient for food, drinking water and general wet environments. Molybdenum-alloyed AISI 316 should be chosen for chloride-containing water, marine environments and aggressive chemicals.
Advantages
Corrosion Resistance Without Coating
- Protection comes from the material itself
- No coating wear or peeling
Hygienic Surface
- Suitable for cleaning in food and pharmaceutical lines
Two Material Options
- 304 for general use, 316 for aggressive media
Wide Size Range
- From 1/8″ to 4″, from instrument lines to mains
Detachable Unions
- Taper seat unions let equipment be removed easily
Construction and Design Features
- Investment-cast body; reinforced shoulders at the connection ends (depending on model)
- ISO 7-1 threads compatible with black, galvanized and stainless pipes
- ISO 228-1 parallel thread on union nuts (depending on model)
- Pressure ratings according to ISO 4144 Table 2
- Screwed installation without welding
Send the fitting type, size, material grade (304 / 316) and quantity; we will confirm suitable stainless fittings from stock.
How to Choose?
- Define the mediumChoose AISI 304 for food and clean water, AISI 316 for chloride-containing and aggressive media.
- Check pressure and temperatureCompare operating values with 20 bar (38 °C), 16.5 bar (100 °C) and 15 bar (150 °C).
- Measure size and threadDetermine the pipe size in inches and the thread type of the connected equipment (R / Rp).
- Prepare the fitting listList elbows, tees, sockets, nipples and unions together with the material grade.
Complementary Products
Why ORFA?
Types of Stainless Steel Threaded Fittings
Stainless Steel Threaded Elbows
Stainless steel threaded elbows are corrosion-resistant fittings used to change direction on threaded stainless steel lines.
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Stainless Steel Threaded Plugs and Caps
Stainless steel threaded plugs and caps are used to close the ends of stainless steel pipes and fittings.
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Stainless Steel Threaded Crosses
Stainless steel threaded crosses split flow in four directions on threaded stainless steel lines.
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Stainless Steel Threaded Reducers
Stainless steel threaded reducers are fittings used to change pipe size on threaded stainless steel lines.
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Stainless Steel Threaded Tees
Stainless steel threaded tees split flow in three directions on threaded stainless steel pipelines.
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Stainless Steel Hose Fittings
Stainless steel hose fittings are used to connect a hose to a threaded line.
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Stainless Steel Conical Unions
Stainless steel conical unions provide a tight, removable connection on threaded stainless steel pipes through a conical seat.
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Stainless Steel Street Elbows
Stainless steel street elbows are stainless steel elbows with one female and one male threaded end.
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Stainless Steel Sockets
Stainless steel sockets are female threaded fittings that join two stainless steel pipes in a straight line.
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Stainless Steel Nipples
Stainless steel nipples are stainless steel pieces with male threads on both ends that connect two female threaded fittings.
Details →Other Threaded Fittings
Threaded Black Fittings
Threaded black fittings are cast fittings such as elbows, tees, sockets and reducers that provide threaded joints in black steel pipelines.
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Galvanized Fittings
Galvanized fittings are zinc coated threaded fittings that resist corrosion, used in water and fire protection installations.
Details →
Brass Fittings
Brass fittings are corrosion resistant threaded fittings used in water, heating and gas installations.
Details →Get a quote for your project
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