NBR O-Rings

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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.

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

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

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

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

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

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

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

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

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.

How to Specify and Order This Part

• Confirm there is no significant ozone or weather exposure before choosing nitrile

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

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

Give the continuous and peak temperature rather than a single figure

• Use an AS568 dash number where one exists to avoid tooling

Use an AS568 dash number where one exists to avoid tooling

• Store away from direct sunlight and heat sources

Store away from direct sunlight and heat sources

Related Products

O-Rings

An O-ring is the cheapest part in most assemblies and the most common cause of a warranty return.

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.

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.

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.

Related Guides and Industries

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.

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.

NBR O-Rings Questions

Oil, fuel and hydrocarbon contact at moderate temperature. It is the default industrial sealing compound for that duty.

Where there is significant ozone or weather exposure, or where temperature or chemistry exceeds what nitrile handles. EPDM or FKM would be the alternatives.

Yes, from moulds we already hold, so there is no tooling charge.

It depends on size and quantity. Send the size list and we will tell you before you commit.

Yes. Twelve compounds are available from us on one order.

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.