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Hygienic USIT® seal and shim washers

Hygienic USIT® seal and shim washers

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DescriptionProduct description:

With its highly reliable sealing and design that is compliant with hygiene requirements, the Hygienic USIT® seal and shim washer is setting new standards for cleanliness in the process industry. Many manufacturers of machinery and systems for the food and pharmaceutical industries often use standard shim washers or O-rings for screw connections in or on the product chamber. These are not EHEDG-compliant, however, as contamination and biofilms in the form of bacteria colonies and corrosion can form under the screw head, preventing the design from achieving maximum hygiene standards.

The metallic shim washer with a fixed sealing ring made from 70 EPDM 291 (black) or 70 EPDM 253815 (white) provides a secure, cavity-free seal. The Hygienic USIT® seal and shim washer, made from the fluorinated premium compound Fluoroprene® XP 45, is suitable for applications involving particularly aggressive CIP/SIP cleaning temperatures, high steam sterilisation temperatures and process media containing grease. This material has an even larger operating temperature range and is resistant to polar and non-polar media as well as flavouring substances.

Approvals such as FDA, EU1935/2004 and USP Class VI (121°C), plus EHEDG certification, confirm that the Hygienic USIT® washer represents the ideal choice for hygienically demanding applications in the food, beverage and pharmaceutical industries.

Stainless steel 1.4404.
Sealing ring:
70 EPDM 291 (black)
70 EPDM 253815 (white)
75 Fluoroprene® XP 45 (blue)
Note:The EHEDG certificate is only valid when a specifically matched hexagon head bolt K1492 or cap nut K1493 is used.Attention:The function of the Hygienic USIT® screw connection system has been tested in combination with stainless steel materials and standard cleaning materials.
The user must check that it is suitable for the application in question.
Accessory:The Hygienic USIT® seal and shim washers can be used with all other products of the Hygienic USIT® range.Drawing reference:
1) Cavity free sealing
Special features:
DownloadHere is all the information as a PDF datasheet:

Are you looking for CAD data? These can be found directly in the product table.
 Datasheet K1491 Hygienic USIT® seal and shim washers 238 kB
 Technical information Hygienic USIT ® 311 kB


Hygienic USIT® seal and shim washers

Item selection/filter

Order No.

DD1SSuitable for
hexagon screws
cap nuts
K1491.04170 EPDM 291black4,19,71M4M4 on request
K1491.05170 EPDM 291black5,110,71M5M5 on request
K1491.06170 EPDM 291black6,113,11M6M6 on request
K1491.08170 EPDM 291black8,116,91M8M8 on request
K1491.10170 EPDM 291black10,121,21,5M10M10 on request
K1491.12170 EPDM 291black12,125,51,5M12M12 on request
K1491.16170 EPDM 291black16,133,91,5M16M16 on request
K1491.04270 EPDM 253815white4,19,71M4M4 on request
K1491.05270 EPDM 253815white5,110,71M5M5 on request
K1491.06270 EPDM 253815white6,113,11M6M6 on request
K1491.08270 EPDM 253815white8,116,91M8M8 on request
K1491.10270 EPDM 253815white10,121,21,5M10M10 on request
K1491.12270 EPDM 253815white12,125,51,5M12M12 on request
K1491.16270 EPDM 253815white16,133,91,5M16M16 on request
K1491.044fluoroprene XP 45blue4,19,71M4M4 on request
K1491.054fluoroprene XP 45blue5,110,71M5M5 on request
K1491.064fluoroprene XP 45blue6,113,11M6M6 on request
K1491.084fluoroprene XP 45blue8,116,91M8M8 on request
K1491.104fluoroprene XP 45blue10,121,21,5M10M10 on request
K1491.124fluoroprene XP 45blue12,125,51,5M12M12 on request
K1491.164fluoroprene XP 45blue16,133,91,5M16M16 on request
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