179mm ID x 3mm C/S (185mm OD) FKM O Ring
£1.50 – £7.50 / each
Was
each
total
15 in stock, ready for shipping today.
Add 4 more and save 20.0%.
FKM (Fluoroelastomer / Viton®) O Rings
376 products
- View specification
275mm ID x 2.5mm C/S (280mm OD) FKM O Ring
£1.45 – £7.25 / each
Waseach totalView specification175 in stock, ready for shipping today.
Add 4 more and save 20.0%.
55mm ID x 2mm C/S (59mm OD) FKM O Ring
£0.36 – £2.43 / each
Waseach totalView specification51 in stock, ready for shipping today.
Add 4 more and save 25.0%.
100mm ID x 4mm C/S (108mm OD) FKM O Ring
£1.37 – £6.85 / each
Waseach totalView specification66 in stock, ready for shipping today.
Add 4 more and save 20.0%.
BS338 FKM O Ring - 78.74mm ID x 5.33mm C/S (89.4mm OD)
£2.80 – £8.00 / each
Waseach totalView specification7 in stock, ready for shipping today.
Add 4 more and save 17.0%.
71mm ID x 3.5mm C/S (78mm OD) FKM O Ring
£1.78 – £8.90 / each
Waseach totalView specification3 in stock, ready for shipping today.
Add 4 more and save 20.0%.
4.5mm ID x 2mm C/S (8.5mm OD) FKM O Ring
£0.02 – £0.75 / each
Waseach totalView specification1826 in stock, ready for shipping today.
Add 4 more and save 33.0%.
30mm ID x 3mm C/S (36mm OD) FKM O Ring
£0.37 – £2.03 / each
Waseach totalView specification17 in stock, ready for shipping today.
Add 4 more and save 20.0%.
BS014 FKM O Ring - 12.42mm ID x 1.78mm C/S (15.98mm OD)
£0.05 – £0.75 / each
Waseach totalView specification933 in stock, ready for shipping today.
Add 4 more and save 33.0%.
5mm ID x 1mm C/S (7mm OD) FKM O Ring
£0.02 – £0.80 / each
Waseach totalView specification1470 in stock, ready for shipping today.
Add 4 more and save 33.0%.
17.3mm ID x 2.4mm C/S (22.1mm OD) FKM O Ring
£0.35 – £2.30 / each
Waseach totalView specification23 in stock, ready for shipping today.
Add 4 more and save 25.0%.
62mm ID x 3mm C/S (68mm OD) FKM O Ring
£0.34 – £2.26 / each
Waseach totalView specification62 in stock, ready for shipping today.
Add 4 more and save 25.0%.
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:
-
Temperatures from –20 °C up to +200 °C (with peaks of 230 °C in some compounds)
-
Chemicals like fuels, oils, acids, and solvents
-
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
-
Fuel injectors & turbo kits
-
Industrial pumps and valves
-
High-performance engines
-
Chemical sealing and lab equipment
Contact us
Here to help
Got a question we haven’t answered yet? Ask our team. We reply within a day, and good questions become new articles for everyone.