Rubber Seals
O-Rings
An O-ring is the cheapest part in most assemblies and the most common cause of a warranty return.
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Rubber Seals
NBR O-Rings
NBR is the working compound for anything that meets oil or fuel at moderate temperature. Its oil resistance is good, its cost is reasonable, and for that reason it carries more industrial sealing than any other single elastomer. We supply NBR O-rings for automotive, aerospace, wire and cable and home appliance applications, in AS568 sizes from existing moulds and in custom sizes tooled here.
Why It Wins
Key Benefits
- Good resistance to oils fuels and other hydrocarbons in ordinary service
- The best balance of cost against performance in our range for hydrocarbon duty
- Standard AS568 sizes with no tooling cost and no tooling lead time
- Custom sizes tooled in our own mould workshop rather than substituted
- Consistent formulation between repeat orders because our own formula engineers own the recipe
The Brief
Problems It Solves
- Seals hardening or swelling because a non oil resistant compound was fitted in an oil circuit
- Over specifying an expensive fluoroelastomer where nitrile is entirely adequate
- Tooling cost on sizes that already exist in the AS568 series
- Batch to batch variation when the compound recipe is not controlled
Audience
Who It Is For
- Automotive and vehicle parts buyers sourcing oil resistant seals in volume
- Appliance manufacturers needing a reliable general purpose seal
- Maintenance teams replacing seals in oil handling equipment
- Distributors supplying a general industrial seal range
In Service
Application Scenarios
- Automotive fuel and lubrication circuits
- Aerospace equipment sealing
- Wire and cable applications
- Home appliance assemblies
- General hydraulic and pneumatic sealing at moderate temperature
Specification
What You Are Actually Buying
Only values our own records support appear here. Anything we cannot evidence is left out rather than estimated.
| Material | NBR nitrile rubber |
|---|---|
| Key Property | Good oil and fuel resistance |
| Typical Industries | Automotive, aerospace, wire and cable, home appliances |
| Standard Sizes | AS568 series from moulds held in house |
| Custom Sizes | Tooled to drawing |
| Country of Manufacture | China |
Materials
- NBR
Manufacturing Process
- Compound mixing
- Mould selection or tooling
- Compression or transfer moulding
- Deflashing
- Inspection
- Packing
Detail
Technical Features
- Nitrile compound formulated for oil and fuel contact
- Available across the AS568 size series from existing moulds
- Custom inside diameter and cross section available to drawing
- Formula and process work carried out by our own engineers
How We Check
Quality Control
- Compound formulated in house rather than bought as an unknown masterbatch
- First article approved by the customer before series production
- Dimensional check against the approved sample before packing
- Same formulation reused on repeat orders
Made to Order
Customisation Options
- Any AS568 dash number or a custom size to drawing
- Hardness selected against pressure and extrusion gap
- Colour coding where a plant identifies compounds visually
- Supplied alongside other compounds on one mixed order
Honest Comparison
Where This Is the Right Choice and Where It Is Not
Compared With EPDM
EPDM is the better choice for water, steam, brake fluid and weather exposure, and the wrong choice wherever mineral oil is present. NBR is the reverse.
Compared With FKM
FKM extends chemical and temperature range well beyond NBR at higher cost. Where NBR is adequate, FKM is money spent on margin you do not use.
Compared With HNBR
HNBR is what we use for cold medium service such as power steering pipes, where standard nitrile is at its limit.
Use Guide
How to Specify and Order This Part
Confirm there is no significant ozone or weather exposure before choosing nitrile
State the oil or fuel type so the compound can be matched to it
Give the continuous and peak temperature rather than a single figure
Use an AS568 dash number where one exists to avoid tooling
Store away from direct sunlight and heat sources
Related Products
Rubber Seals
AS568 O-Ring Series
We possess all the moulds for the AS568 O-ring size range, which lets us supply standard parts of the series promptly and without a tooling step.
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Rubber Seals
HNBR O-Rings and HNBR Seals
HNBR is the compound we reach for when a nitrile seal has to stay reliable in cold medium service.
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Rubber Seals
EPDM Seals and EPDM O-Rings
EPDM has good weather resistance and unusual versatility, which is why it appears across automotive, electrical and electronic products, daily necessities, sports equipment and mechanised industrial equipment, as well as in wires, cables and high voltage and ultra high voltage insulation materials.
View product →Related Guides and Industries
Guide
EPDM and NBR Where Each One Belongs and Where It Fails
These two compounds cover an enormous share of industrial sealing between them, and they fail in each other's territory. Getting the boundary right removes most avoidable seal problems.
Read the guide →
Guide
How to Choose a Rubber Seal Material in Six Questions
Six questions decide almost every seal material choice. Answer them before you ask for a price, and the quotation you get back will be worth comparing.
Read the guide →Answers
NBR O-Rings Questions
What is NBR good for?
Oil, fuel and hydrocarbon contact at moderate temperature. It is the default industrial sealing compound for that duty.
Where should I not use NBR?
Where there is significant ozone or weather exposure, or where temperature or chemistry exceeds what nitrile handles. EPDM or FKM would be the alternatives.
Can you supply NBR in AS568 sizes?
Yes, from moulds we already hold, so there is no tooling charge.
Is there a minimum order?
It depends on size and quantity. Send the size list and we will tell you before you commit.
Can you quote a mixed NBR and FKM schedule?
Yes. Twelve compounds are available from us on one order.
How quickly do you quote?
Within one working day of receiving sizes, compound and quantities.
Quote NBR O-Rings
Send the size or drawing, the working conditions and the quantity. One working day for a considered reply.