EN 10253

Butt-welding pipe fittings

Wrought austenitic and austenitic-ferritic (duplex) stainless steels

This European Standard specifies the technical delivery requirements for seamless and welded butt-welding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of austenitic and austenitic-ferritic (duplex) stainless steel which are intended for pressure and corrosion resisting purposes at room temperature, at low temperature or at elevated temperatures. It specifies: the steel grades; - the mechanical properties; - the dimensions and tolerances; - the requirements for inspection and testing; - the inspection documents; - the marking; - the handling and packaging. Unless otherwise specified in this European Standard the general technical delivery requirements in EN 10021 apply.

Fitting types

EN 10253-4 type A
EN 10253-4 type B

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DIN 2605

Steel butt-welding pipe fittings

This standard specifies the design and dimensions of seamless and welded steel elbows and bends rated
for the same internal pressure as the pipes to which they are to be connected. The DIN 2605 has been superseded by the EN 10253 Standard. 

Part 1: Elbows and bends for use with reduced pressure

Part 2: Elbows and bends for use at full service pressure


The DIN 2605 types are mainly derived from the internal radii of the fitting.

  • DIN 2605 type 2
  • DIN 2605 type 3
  • DIN 2605 type 5
  • DIN 2605 type 10
  • DIN 2605 type 20

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Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings

This specification covers two general classes, known as WP (Wrought Pipe) and CR (Corrosion Resistant) stainless steel fittings of both seamless and welded construction.

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British Standard Pipe Thread

British Standard Pipe (BSP) is a family of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external (male) thread with an internal (female) thread. It has been adopted as standard in plumbing and pipe fitting, except in the United States, where NPT and related threads are the standard used. - Wikipedia: British Standard Pipe

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ANSI B1.20.1

NPT - National Pipe Thread Taper (ANSI B1.20.1)

American National Standard Pipe Thread standards, often called national pipe thread standards for short, are U.S. national technical standards for screw threads used on threaded pipes and pipe fittings. They include both tapered and straight thread series for various purposes including rigidity, pressure-tight sealing, or both.[1] The various types are each named with a symbol and a full name; examples of the symbols include NPT, NPS, NPTF, NPSC, and others.

Outside the United States, some US pipe threads are found, as well as many British Standard Pipe threads and ISO 7-1, 7-2, 228-1, and 228-2 threads. Wikipedia NPT

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ASTM A182 Standard

Standard specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves and parts for high-temperature service.

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ASME B16.5

ASME B16.5 Standard

American standard for flanges and flanged fittings NPS 1/2" to 24".

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