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 11864 & DIN 11853 Aseptic Unions

DIN11864 and DIN 11853 Aseptic Unions for Orbital Welding


DIN11864 and 11853 unions were developed to meet the exacting needs of the food, chemical and pharmaceutical industries.  This range of unions has been developed from the three most common systems used in the hygienic and sanitary industries; namely the “Aseptic” screwed union to DIN11864-1; the “Aseptic” flange union to DIN11864-2 and the “Aseptic” clamp union to DIN11864-3.


Available with optional lengths to suit both orbital and manual welding, these unions have been designed to match tube and pipe specifications to DIN11866 Table A (DIN11850); DIN11866 Table B (ISO 1127) & DIN11866 Table C (ASME BPE).


We also offer a complementary range of DIN11865 fittings that include the bends, tees and reducers with the polished finish to match your application.


Size range:     10mm to 150mm and ½” to 4”

                        Specials are available up to 304mm


Materials:       316L SS 1.4404 and 1.4435 optional.

                         Specials available in Duplex and Alloy 22


Related standards:

DIN 11864-1 Form A
DIN 11864-2 Form A
DIN 11864-3 Form A
DIN11866 Table A, B and C
DIN 11853-1 Form A
DIN 11853-2 Form A
DIN 11853-3 Form A


Surface finishes:






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