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SMS Unions

SMS Coupling (SMS Male Part, SMS Nut, SMS Liner, SMS Gasket)

The stainless steel SMS Union (Swedish Metric Standard) is comprised of an SMS round slotted nut, SMS male part, SMS liner, and SMS seal. SMS blanks and blank nuts with chain are also available.

The easiest way to identify an SMS Union is its L Shape Gasket. Another commonly used gasket profile is the square shaped gasket.

The SMS coupling is very commonly used in the sanitary industry. The liners do not have to be taken out of the male thread for dismounting. A SMS coupling has very short welding ends.


Coupling Material

SMS Nut in SS 304, SMS Male Part and Liner in SS 304 or SS 316L

Seal Material

The SMS gaskets comes in Teflon, BUNA, EPDM, Silicone, and Viton

Size Ranges

From 1” to 4”

Internal Surface Finish

< 1μm



To fasten the union by using a spanner.

SMS Male Part 

To be welded to tubes.

SMS Liner

To be welded to tubes.

SMS Gasket

Acts as a seal to prevent leakages.

SMS Blank / SMS Blind

Acts as a cover to to block flow, replaces an SMS Liner.

SMS Blank Nut with Chain

Acts as a cover to block flow, replaces an SMS Nut and Liner.

Malaysia SMS Union
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