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Flanges & Components > ISO Flanges & Components > ISO O-Rings & Centering Rings

Replacement O-Rings (Silicone)

These replacement elastomeric o-rings are used (in conjunction with a centering ring -- not included) for sealing ISO flanges. The ISO flange (also called Large ISO) is used for HV chamber ports and is available in two distinct styles; ISO-K which uses clamp fasteners and ISO-F which uses nut and bolt fasteners.

O-Rings Feature:

  • O-Rings available in Viton (fluorocarbon), Buna-N (nitrile rubber), and silicone materials
  • The more popular o-ring sizes for vacuum use are listed below; contact us for other sizes or for application questions

Dimensional Drawings

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VacuCAD is a free library containing thousands of 2D CAD drawings (in DXF format) and 3D Models (in STP format) for many of our standard vacuum components and chambers. Please Log in

Ordering Table

(Click column headers to sort data)

Flange
Size
Material O-Ring ID O-Ring
Cross Section
Weight
lbs
PartNo Price Add Item
VacuCADSM
Flange
Size
Material O-Ring ID O-Ring
Cross Section
Weight
lbs
PartNo Price Add Item
VacuCADSM
ISO63 Silicone 2.85 0.21 0.25
O-S336
$17.00
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ISO80 Silicone 3.35 0.21 0.25
O-S340
$11.40
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ISO100 Silicone 4.1 0.21 0.25
O-S346
$17.20
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ISO160 Silicone 5.98 0.21 0.25
O-S361
$13.70
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ISO200 Silicone 8.48 0.21 0.25
O-S371
$13.90
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ISO250 Silicone 10.48 0.21 0.25
O-S378
$13.40
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ISO320 Silicone 12.48 0.28 0.25
O-S454
$19.60
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ISO400 Silicone 15.48 0.28 0.25
O-S460
$20.60
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ISO500 Silicone 19.46 0.28 0.25
O-S468
$25.80
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ISO630 Silicone 24.94 0.28 0.25
O-S474
$27.90
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ISO:9001 The Kurt J. Lesker Company is an ISO:9001 certified company. Copyright ©1996-2017 Kurt J. Lesker Company® All rights reserved.