Alchem Process Ltd
Unit 4 Church Road Ind Estate,
Gorslas, Llanelli, Carmarthenshire,
SA14 7NN.
Tel: 00 44 (0) 1269 841 324

DIN 11864 & DIN 11853 Aseptic Unions

DIN 11865 Table A Orbital Weld Fittings

Download Data Sheet in PDF Format: 

Table A  -  DIN11850 / 11866 / EN10357-A

Table B  -  ISO1127

Table C  -  ASME BPE and BS4825


Alchem Process Ltd offer a range of stainless steels fittings suitable for orbital welding in the aseptic, chemical and pharmaceutical industries.

The range includes – equal tees, reducing tees, bends and both concentric and eccentric reducers.

Each fitting has extended tangents to allow use with orbital welding sets.  The products are supplied in a range of different surface finishes to match the client requirements.

The range accommodates three tube sizes common to the industry, namely DIN11866 (Table A), ISO 1127 (Table B) and ASME BPE 2014 (Table C).


Available with optional lengths to suit Orbital and Manual Welding, these unions have been designed to match tube and pipe specifications in DIN 11850; ISO 2037, ASME BPE 2002 and BS 4825 Part 1 and also ISO 1127 for schedule pipe.

Size range: ½” to 4”

Materials: 316L SS (1.4404 and 1.4435)


Related standards:

DIN 11864-1 Form A - Aseptic Screwed Union

DIN 11864-2 Form A - Aseptic Flange Union

DIN 11864-3 Form A - Aseptic Tri-Clamp Union

DIN 11853-1 Form A - Aseptic Screwed Union

DIN 11853-2 Form A - Aseptic Flange Union

DIN 11853-3 Form A - Aseptic Tri-Clamp Union

DIN 11866 / 11850 Tubes

EN10357 – Tubes for hygienic applications

ISO 1127 - Pipes

ISO 2037 / BS 4825 /ASME BPE 2014



All tube are supplied with Material Certification to EN10204 3.1, AD2000-W2 on enquiry request




Surface Finish Condition



Inner Surface


Seam Condition

Outer Surface


<1.60 µM Ra

<3.20 µM Ra

Descaled (Pickled) and Unpolished




Dull Polished

<1.0µM Ra



<0.80 µM Ra

<1.60 µM Ra


<0.80 µM Ra

<0.80 µM Ra


<0.40 µM Ra

<0.40 µM Ra


<0.25 µM Ra

<0.25 µM Ra