An SMS coupling (or SMS union) is a hygienic pipe connection system standardized by the Swedish Manufacturing Standard (SMS 1149). It is commonly used in industries requiring sanitary, easy-to-clean fittings—primarily:
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Food and beverage
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Dairy
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Pharmaceutical
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Cosmetics
Key Components of an SMS Coupling:
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Male Part (Welded Liner)
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Female Part (Welded Nut or Weld Ferrule)
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When assembled, the nut compresses the gasket between the male and female parts, forming a leak-tight, hygienic seal.
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Nut (Hex or Round with Lugs) – used to tighten the union
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Gasket – for sealing (EPDM, NBR, PTFE, etc.)
Features & Benefits:
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Hygienic Design: Minimal dead space to prevent bacterial growth.
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Easy to Clean: Suitable for CIP (Clean-In-Place) and SIP (Sterilize-In-Place).
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Robust and Reusable
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Tool-Free Assembly (in many cases)
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Made from stainless steel AISI 316L or 304
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Smooth internal finish (Ra < 0.8 µm usually)
Applications:
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Milk and juice processing
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Brewery piping
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Biopharmaceutical manufacturing
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Cosmetic ingredient handling
