SMS Stainless Steel Fittings Dimensions

SMS (Swedish Standard) is a hygienic pipe fitting standard widely used across Europe, sharing the same basic union concept as RJT and IDF — a male part and weld liner welded to each pipe end, joined by a captive nut, with a smooth-bore, crevice-free seal design that suits frequent dismantling for cleaning. SMS fittings use their own thread form and sealing geometry, distinct from RJT and IDF, so parts across these standards are not interchangeable even where the nominal pipe size matches.

The charts below give dimensional information for SMS standard male, nut, weld liner, blank, and seal parts. Dimensions shown are in mm; if you wish to convert to inches, please use our universal converter.

Dimensional Charts relating to SMS Standard Male, Nut, Weld Liner, Blank and Seal Parts. [cite: 65]

SMS fittings (Swedish Standard) are used extensively in the UK and throughout Europe. [cite: 66] This is a hygienic fitting which has a smooth bore with a crevice free design. [cite: 66, 67] Sections of line can be easily removed, enhancing the unions suitability for use in frequently dismantled systems. [cite: 67]

Dimensions shown are in mm, if you wish to convert to Inches, please use our universal converter.

SMS WELD MALE PART DIMENSIONS

Nominal Size		A	B	C	D
inch	mm	mm	mm	mm	mm
1	25.4	25.4	40.0	15.0	22.6
1 1/2	38.1	38.1	60.0	20.0	35.6
2	50.8	50.8	70.0	20.0	48.8
2 1/2	63.5	63.5	85.0	24.0	60.3
3	76.2	76.2	98.0	24.0	72.8
4	101.6	101.6	125.0	30.0	87.6
4	101.6	101.6	132.0	28.0	97.6

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SMS NUT DIMENSIONS

Nominal Size		A	B	C	D
inch	mm	mm	mm	mm	mm
1	25.4	51.0	20.0	32.0	40.0
1 1/2	38.1	74.0	25.0	48.0	60.0
2	50.8	84.0	26.0	60.5	70.0
2 1/2	63.5	100.0	30.0	74.0	85.0
3	76.2	114.0	32.0	87.0	98.0
4	101.6	138.0	31.0	113.0	125.0
4	101.6	150.0	30.0	113.0	132.0

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SMS WELD LINER DIMENSIONS

Nominal Size		A	B	C	D
inch	mm	mm	mm	mm	mm
1	25.4	35.5	15.5	25.4	22.6
1 1/2	38.1	55.0	16.0	38.1	35.6
2	50.8	65.0	17.0	50.8	48.6
2 1/2	63.5	80.0	17.0	63.5	60.3
3	76.2	93.0	19.0	76.2	72.9
4	101.6	118.0	19.0	101.6	97.6
4	101.6	127.0	19.0	101.6	97.6

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SMS BLANK DIMENSIONS

Nominal Size		A	B	C
inch	mm	mm	mm	mm
1	25.4	35.5	7.6	3.5
1 1/2	38.1	55	8	5
2	50.8	65	9.2	5
2 1/2	63.5	80	11	5
3	76.2	93	11	5
4	101.6	118.0	11.0	5
4	101.6	127.0	11.0	5

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SMS SEAL DIMENSIONS

Nominal Size		A	B	C
inch	mm	mm	mm	mm
1	25.4	22.5	32.5	5.5
1 1/2	38.1	35.5	48.0	5.5
2	50.8	48.5	61.0	5.5
2 1/2	63.5	60.5	73.5	5.5
3	76.2	72.0	86.0	5.5
4	101.6	101.6	114.0	5.5

RELATED PAGES

• RJT Stainless Steel Fittings
• IDF Stainless Steel Fittings Dimensions
• DIN Stainless Steel Fittings Dimensions

FREQUENTLY ASKED QUESTIONS

Where is SMS used compared to RJT?

SMS is common throughout mainland Europe and internationally, while RJT is the more common standard specifically in the UK. On a mixed or international site, it's worth confirming which standard existing pipework is built to before ordering replacement parts, since the two aren't interchangeable. See our RJT Fittings chart for comparison.

What does "crevice-free" mean for a hygienic fitting?

It means the fitting's internal bore and sealing arrangement avoid small gaps, ledges, or pockets where product residue or bacteria could collect and survive cleaning-in-place (CIP) processes — a key requirement for food, dairy, and pharmaceutical hygiene standards.