The DIN 11851 Hygienic Union, often called the "Dairy Coupling," is a global standard for stainless steel pipe fittings in the food, beverage, and chemical industries.
It consists of:
Male part (threaded)
Liner (welded to pipe)
Round nut (scalloped for C-spanners)
D-shaped seal (EPDM, FKM, or PTFE)
Technical Specifications & Attributes
Standard,DIN 11851 (German Institute for Standardization)
Common Name,Dairy Coupling / Sanitary Screwed Union
Material (Metal),AISI 304 (1.4301) or AISI 316L (1.4404)
Seal Materials,"EPDM (Standard), NBR, FKM (Viton), or PTFE"
Size Range,DN10 to DN150 (6mm to 150mm pipe ID)
Pressure Rating,Up to 40 bar (DN10-40); 25 bar (DN50-100); 16 bar (DN125+)
Thread Type,Whitworth Pipe Thread (DIN 405-1)
Surface Finish,Internal Ra < 0.8 µm (Standard hygienic polish)
Temperature Range,-20°C to +140°C (Dependent on seal material)
Connection Types,"Butt-weld, Expanding (Rolled), or Blind (Cap)"
Assembly Method,Manual tightening followed by C-Spanner / Hook wrench
Cleaning Suitability,CIP (Clean-In-Place) and manual strip-down cleaning
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