SMS Seals (SS 1149)

SMS seals are square section rings typically used in SMS (Swedish Metric Standard) sanitary unions.

The union assembly consists of an internally threaded nut, liner and externally threaded male part. The elastomer SMS seal is captive, located in a groove within the male part of the union assembly. This design provides a smooth, crevice-free internal bore, which is ideal for applications that do not demand constant disassembly of pipes/hoses.

SMS seals are available in lipped and unlipped profiles, in EPDM and FKM material grades that have been certified to FDA and 3-A standards. Metal detectable elastomers are also available from our Detectaseal range.

A diagram of an unlipped SMS seal, with OD and ID dimensions indicated.

SMS seal with unlipped profile

DN SizeOD
(mm)
ID
(mm)
Height
(mm)
2532.025.05.5
3240.032.05.5
3848.038.05.5
5161.051.05.5
63.573.563.55.5
7686.076.05.5
89101.089.05.5
108120.0108.05.5
A diagram of a lipped SMS seal, with OD and ID dimensions indicated.

SMS seal with lipped profile

DN SizeOD
(mm)
ID
(mm)
Height
(mm)
2532.022.55.5
3848.035.55.5
5161.048.55.5
63.573.560.55.5
7686.072.95.5
101.6113.5100.05.5
Industry image for food, dairy, and water seals and gaskets

SMS seals are ideal for applications which don’t require constant disassembly of pipes and hoses.

Materials for SMS seals

SS 1140 seals are available in the following elastomer materials, and are certified to FDA, USP Class VI, and 3-A Sanitary Standards.

Close up of two white O-rings overlaid

Material Type: FFKM

Color: White

Temp Range (°C): -15 to +260

FDA: A-F

USP: 87+88

3A 18-03: Class I

Metal Detectable?: No

An arrangement of white O-rings on a blue background

Material Type: FKM

Color: White

Temp Range (°C): -15 to +200

FDA: A-F

USP: 87+88

3A 18-03: Class I

Metal Detectable?: No

Detectaseal elastomer O-rings

Material Type: EPDM

Color: Blue

Temp Range (°C): -40 to +150

FDA: A-F

USP:

3A 18-03:

Metal Detectable?: Yes

Detectaseal elastomer O-rings

Material Type: Silicone (VMQ)

Color: Black

Temp Range (°C): -60 to +200

FDA: A-F

USP: 88

3A 18-03:

Metal Detectable?: Yes

All above materials are compliant with EC1935 and EC2023 regulations, and are free from animal-derived ingredients (ADI free).

FDA, USP, and 3A 18-03 certificates and material datasheets are available to download.

Our high performance sealing materials

SMS seals can be manufactured in the following material types:

The ultimate perfluoroelastomers for sealing applications where chemical resistance and high temperature performance are critical.

The latest advance in contamination detection and containment, with metal-detectable and xray-detectable elastomers designed to meet the stringent demands of food and pharmaceutical processing industries.

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O-ring groove dimensions calculator

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