NBR O-Rings

Workhorse oil & fuel seal ring

Precision nitrile O-rings — the industry default for mineral oil, fuel and hydraulic sealing at a sensible cost.

Excellent resistance to mineral oils, fuels and hydraulics
Good tensile strength and abrasion resistance
Precision-moulded to AS568 and ISO 3601 sizes
70 Shore A standard; 70–90 durometer range
Economical, immediately available

Temperature: -30°C to +120°C
Pressure: Up to 210 bar (with anti-extrusion back-up)
pH range: 5 – 10

Assorted black NBR nitrile O-rings in a range of cross-sections — O-RingsREF · nbr-oring

Technical DatasheetSPEC

The numbers, on the record

Every figure below is the specification we hold ourselves to — material, service envelope, media compatibility and conformance. Download it as a standalone document for your dossier.

SealGuard

Technical Datasheet

Doc No.: DS-NBR-ORING
Revision: Rev. A
Issue: 2026-Q3
Class: O-Rings

NBR O-Rings

Workhorse oil & fuel seal ring

01

Material & Construction

Acrylonitrile-butadiene rubber (NBR / nitrile); HNBR and low-temperature grades

02

Service Envelope

Temperature range	-30°C to +120°C
Pressure rating	Up to 210 bar (with anti-extrusion back-up)
pH range	5 – 10

03

Media Compatibility

Mineral oilsFuels & dieselHydraulic fluidsWaterAir

04

Dimensions & Sizing

AS568 -001 to -475 · metric BS 1806 / ISO 3601 · cord Ø1.0–10.0 mm

05

Standards & Conformance

AS568B
ISO 3601
BS 1806

06

Certifications

ISO 9001
FDA grade (white NBR)
RoHS / REACH

07

Additional Specifications

Hardness	70 Shore A standard (70–90 range)
Compression set	Low (good recovery)

Density	≈ 1.25 g/cm³
Not suitable for	Ozone, ketones, strong acids

Specify & QuoteORDER

Build your line item

Choose the material grade and size that match your duty, set a quantity, and add a fully-specified line to your quote. No prices, no obligation — our engineers confirm specification and lead time on every enquiry.

01

Material grades

NBR 70 Shore A (general)
NBR 90 Shore A (high pressure)
HNBR (heat & ozone upgraded)
NBR low-temperature grade
FDA-compliant white NBR

02

Sizes & configurations

AS568 -001 to -475
Metric BS 1806 / ISO 3601
Cord Ø1.0–10.0 mm
Vulcanised endless rings (large bore)
Cord stock by the metre
Custom sizes to drawing

In ServiceUSE

Where it holds the line

Nitrile (NBR) is the most widely used O-ring compound in industry, and for good reason: it offers excellent resistance to mineral oils, fuels and hydraulic fluids with good mechanical strength at a low cost. SealGuard NBR O-rings are precision-moulded to AS568 and metric ISO 3601 sizes at a controlled 70 Shore A hardness, with higher durometers and back-up rings available for higher-pressure grooves. For general oil and pneumatic sealing, it is the dependable first choice.

Typical applications

01Hydraulic and pneumatic cylinders
02Fuel-system and oil-line connections
03Pump and valve static seals
04Gearbox and compressor housings
05General machinery sealing

Industries served

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Let’s specify it

Specify this seal for your service.

Send us the media, temperature, pressure and motion for your duty and our engineers will confirm the right material grade, size and standard for your application.

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