In our online shop you will find a large assortment of high quality stainless steel threaded fittings made of AISI
316 stainless steel (UNE EN 10213-4 / DIN 1.4408) formerly and in everyday language referred to as A4 stainless
The addition of 2% molybdenum makes AISI 316 stainless steel - stainless steel A4 – therefor more corrosion
resistant to salt water and chlorinated water. This is why stainless steel fittings made of A4 stainless steel are
very well suited for marine applications, swimming pools and industrial applications. They are suitable for high
Stainless steel threaded fittings made of A4 stainless steel, quality AISI 316
Features of the stainless steel fittings at a glance:
stainless steel fittings
BSP pipe thread G DIN 2999 & BS21, ISO 228/1 & ISO 7/1,
not self-sealing, sealing with
hemp, sealing paste
-20°C to 220°C
Working pressure (PN):
20 bar | -20°C to 40°C
16,5 bar | 100°C
15 bar | 150°C
13,5 bar | 220°C
stainless steel AISI 316-316L A4 (UNE EN 10213-4 / DIN 1.4408)
Dimensions conform to ISO 4144, connection thread according to ISO 7/1 (DIN 2999 / BS
gray stainless steel
Basic technical data for our stainless steel fittings:
Working temperature -20°C to 200°C
Working pressure PN 20 bar (300 psi)
Dimensioning according to ISO 4144
Whitworth thread, CNC machined according to standard ISO 7/1 (DIN 2999 / BS21)
Manufacturing standard UNE EN 10213-4, tolerance DIN 1.4408
Possible usage for V4A stainless steel fittings
Due to the special properties of the material, these fittings are often used in coastal regions. While a A2 fitting
would start to rust due to the high salt content in the air, the A4 stainless steel fitting withstands the coastal
weather. Furthermore, their acid resistance makes them suitable for use in the chemical, food, petrochemical and
natural gas industries. Also, they can be used in corrosive environments and extreme temperatures, such as used in
fluid technology, boilers, condensers, heat exchangers and reactors.
Stainless steel AISI 316 (material 1.4401)
Stainless steel AISI 316 also known as material 1.4401(X5CrNiMo17-12-2, contains an addition of molybdenum, which
improves the resistance to corrosion. According to DVGW worksheet W541 (basis for the requirement of stainless steel
pipes for domestic drinking water installation), the steel material 1.4401 is most commonly used for drinking water
Stainless steel fittings made of AISI 316 stainless steel are listed in the *UBA list for drinking water-compatible
materials in the drinking water installation and can accordingly be used for drinking water supply.
What is A4 stainless steel?
Stainless steel according to EN 10020) is a name for alloyed or unalloyed steels with a special degree of
purity. Consequently, this refers to steels whose sulfur and phosphorus content (so-called iron companions) does not
exceed the value of 0.025%.
The alloy 316 is a standard grade steel with molybdenum. The molybdenum not only gives the alloy a better corrosion
resistance than A2 stainless steel, but also a higher resistance to pitting and crevice corrosion in media
containing chloride. The austenitic structure imparts a high degree of toughness to this alloy, even at cryogenic
temperatures, high creep strength, creep rupture strength and tensile strength at elevated temperatures. The alloy
is also known as A4 stainless steel.
The internal thread (designation "Rp") is parrallel / cylindrical and the external thread (designation "R") is
conical. The nuts of screwed connections are parallel threads (ISO 228-1).
Metal threaded joints can be sealed with Teflon tape, Teflon thread, but also in contrast to plastic fittings with
hemp or similar, for instance foam sealing material.
Assortment of products
For the connection of pipes we carry a different veriety of stainless steel fittings: from pure internal threads
(IG)to combinations of female and male threads, up to male threads (AG). In addition, our product range covers a
wide variety of connection options. For pipes that run the shape of an elbow, our stainless steel
A4 elbow 45 ° or A4 elbow 90 °
would be ideal.
Also versions as A4
or A4 Y-pieces are available
in our online shop. In addition, you will find tube and double nipple
A4 stainless steel hose nozzles
or reducers, such the reducer sleeve A4
to connect pipes of unequal nominal sizes.
A big advantage of threaded fittings is their flexibility. Unlike press fittings or welding fittings, threaded
connections can always be loosened.
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