5mm ID x 3mm C/S (11mm OD) FKM O Ring
£0.06 – £0.80 / each
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each
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1042 in stock, ready for shipping today.
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FKM (Fluoroelastomer / Viton®) O Rings
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5mm ID x 2mm C/S (9mm OD) FKM O Ring
£0.03 – £1.00 / each
Waseach totalView specification859 in stock, ready for shipping today.
Add 4 more and save 33.0%.
5.5mm ID x 3mm C/S (11.5mm OD) FKM O Ring
£0.08 – £1.00 / each
Waseach totalView specification1 in stock, ready for shipping today.
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4mm ID x 2.5mm C/S (9mm OD) FKM O Ring
£0.05 – £0.75 / each
Waseach totalView specification229 in stock, ready for shipping today.
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49mm ID x 1.5mm C/S (52mm OD) FKM O Ring
£0.24 – £1.60 / each
Waseach totalView specification182 in stock, ready for shipping today.
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46mm ID x 2mm C/S (50mm OD) FKM O Ring
£0.23 – £1.80 / each
Waseach totalView specification138 in stock, ready for shipping today.
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45mm ID x 2.5mm C/S (50mm OD) FKM O Ring
£0.21 – £1.65 / each
Waseach totalView specification167 in stock, ready for shipping today.
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45mm ID x 1.5mm C/S (48mm OD) FKM O Ring
£0.14 – £1.40 / each
Waseach totalView specification209 in stock, ready for shipping today.
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44mm ID x 3mm C/S (50mm OD) FKM O Ring
£0.46 – £2.55 / each
Waseach totalView specification59 in stock, ready for shipping today.
Add 4 more and save 20.0%.
44mm ID x 2.5mm C/S (49mm OD) FKM O Ring
£0.26 – £1.70 / each
Waseach totalView specification815 in stock, ready for shipping today.
Add 4 more and save 25.0%.
40mm ID x 3mm C/S (46mm OD) FKM O Ring
£0.27 – £2.10 / each
Waseach totalView specification199 in stock, ready for shipping today.
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3mm ID x 2mm C/S (7mm OD) FKM O Ring
£0.02 – £0.50 / each
Waseach totalView specification1246 in stock, ready for shipping today.
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About FKM (Fluoroelastomer / Viton®) O Rings
Looking for high-performance O-rings that thrive under heat and chemical pressure? FKM O-rings — also commonly known by the brand name Viton® — are your go-to solution for extreme sealing conditions.
What is FKM?
FKM stands for fluoroelastomer, a premium synthetic rubber designed to withstand:
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Temperatures from –20 °C up to +200 °C (with peaks of 230 °C in some compounds)
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Chemicals like fuels, oils, acids, and solvents
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Ozone, UV and weathering over long periods
This makes them ideal for automotive, aerospace, chemical processing, and high-temperature industrial applications.
FKM vs. NBR / Silicone: What's the Difference?
| Feature | FKM (Viton®) | NBR (Nitrile) | Silicone |
|---|---|---|---|
| Temp Range | –20 °C → +200–250 °C | –40 °C → +120 °C | –50 °C → +200 °C |
| Chemical Resistance | Excellent (fuels, oils, solvents) | Moderate | Poor (especially fuels) |
| Ozone/UV Resistance | Excellent | Poor | Excellent |
| Durability / Cost | High durability, higher cost | Budget friendly | Flexible, mid-price |
Not sure what to choose? Get in touch and we’ll help!
Common Uses of FKM O-Rings
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Fuel injectors & turbo kits
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Industrial pumps and valves
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High-performance engines
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Chemical sealing and lab equipment
Contact us
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