- SHORE A
- ±5 pts against the specified hardness
- TENSILE
- Per compound datasheet, ASTM D412
Oil Seals · Made to order
NBR Rotary Shaft Seals — the Standard Oil Seal
Nitrile rotary shaft seals — the default answer for a shaft running in oil, to +120 °C. Made to DIN 3760 and ISO 6194 sizes, with the nitrile content set between your medium and your minimum temperature. Not for weathered or outdoor shafts, where ozone cracks nitrile.
- HARDNESS
- 70–80 Shore A typical for a shaft-seal lip
- TEMPERATURE
- −30 to +120 °C
- SIZE
- Shaft Ø × bore Ø × width
- TYPE
- DIN 3760 Type A (plain lip) or Type AS (with dust lip)
- MEDIUM
- Mineral oil, hydraulic fluid, grease, fuel. Not brake fluid; not exposed to weather
- MADE TO ORDER
- ISO 9001:2015
- 09111526A
Product gallery
Visual Reference
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Cross section viewSection through lip, case and spring — on request
- Shaft diameter
- The first of the three ordering numbers
- Seal type
- DIN 3760 A or AS. On nitrile a dust lip matters more than usual
- Shaft surface finish
- The commonest cause of premature seal failure — too rough abrades the lip, too smooth carries no lubricating film
- Shaft speed
- Surface speed at the lip, not rpm
- Minimum temperature
- Stated separately from the medium
Section drawing available on request. Send shaft diameter, housing bore and width, plus the medium, the shaft speed and the coldest temperature the seal will start at — or the old seal and a note of what failed — and we will confirm type, compound and lip design for approval.
Technical specifications
Engineering Data
- Product Family
- Oil Seals
- Material
- NBR (nitrile)
- Hardness (Shore A)
- 70–80 Shore A typical for a lip
- Tensile Strength
- Per compound datasheet, ASTM D412
- Elongation at Break
- Per compound datasheet, ASTM D412
- Operating Temperature
- −30 to +120 °C, with the floor moving on nitrile content
- Compression Set
- ASTM D395 Method B
- Density
- Per compound datasheet
- Colour Options
- Black standard, custom RAL on request
- Lead Time
- Confirmed with the quotation, from approved drawing and approved sample
- Nitrile content
- Set to your medium and minimum temperature
- Seal type
- DIN 3760 Type A or AS
- Size designation
- Shaft Ø × bore Ø × width, DIN 3760 / ISO 6194
- Medium compatibility
- Mineral oil, hydraulic fluid, grease, diesel and petrol. Not glycol brake fluid, ketones, or prolonged weather exposure
- Max surface speed
- Stated per application
- Shaft surface finish
- Recommended range on the drawing
- Certifications
- ISO 9001:2015 — certificate 09111526A, valid to 21 February 2027
- Minimum Order
- 10,000 pieces per part number, per compound, or quoted against the part where geometry or tooling makes that unrealistic. Prototype and first-article lots sit outside the minimum.
Dimensional reference
- Shaft diameter
- The first of the three ordering numbers
- Seal type
- DIN 3760 A or AS. On nitrile a dust lip matters more than usual
- Shaft surface finish
- The commonest cause of premature seal failure — too rough abrades the lip, too smooth carries no lubricating film
- Shaft speed
- Surface speed at the lip, not rpm
- Minimum temperature
- Stated separately from the medium
Available materials
Rubber Compound Options
Select the compound best suited to your operating environment and application requirements.
| Rank | Compound | Temperature | Why |
|---|---|---|---|
| THIS PAGE | NBR | −30 to +120 °C | The standard oil-seal compound and the cheapest correct answer. Mineral oil, hydraulic fluid, grease, fuel. |
| Leave NBR if… | the shaft is exposed to weather or ozone | — | Nitrile cracks in ozone and UV. Specify neoprene (−40/+120 °C) where some oil resistance is still needed, or EPDM where it is not |
| Leave NBR if… | oil runs hotter than +120 °C | — | Specify AEM (−40/+160 °C) — the step most suppliers skip — or FKM (−20/+250 °C) above that, at 2–3× the cost |
| Leave NBR if… | the medium is water, steam or brake fluid | — | Specify EPDM (−40/+140 °C). Glycol brake fluid is EPDM’s job, not nitrile’s |
| Leave NBR if… | the shaft starts below −30 °C | — | A lower nitrile content buys some of this back, at the cost of oil resistance — or specify silicone (−60/+220 °C) if the medium allows |
| Also available | SBR · natural rubber | See the compound table | No oil resistance — available, but not shaft-seal compounds |
Not sure? Send the medium, temperature and load
SIZE STANDARD
DIN 3760 / ISO 6194
shaft Ø × bore Ø × width
Key advantages
Why Specifiers Choose Margo
Usually the right answer, and the cheapest one
Nitrile has been the standard shaft-seal compound for decades. If your shaft runs in oil below +120 °C and is not exposed to weather, you do not need anything dearer — and we will say so.
We set the nitrile content
Higher acrylonitrile resists oil better and stiffens sooner in the cold; lower stays flexible and swells more. We mix our own compounds, so tell us the medium and the coldest start temperature and we set it between them.
Not for daylight
Nitrile cracks in ozone and UV — the commonest mistake made with it. If the shaft is outdoors or on exposed plant, specify neoprene where oil resistance still matters, or EPDM where it does not.
Tell us about the shaft, not just the seal
Surface finish, hardness and running speed decide how long a lip lasts. A badly ground shaft destroys a correct seal in weeks — so we ask about it before quoting, not afterwards.
Industries served
Global Applications
Automotive
Engine, gearbox, axle and wheel-end shafts, hydraulic and steering systems
Heavy Industry
Gearbox, drive and hydraulic shafts on plant and machinery
Pumps & Valves
Oil and hydraulic pump shafts
Manufacturing process
From Compound to Certification
Material compounding
Polymer blending, additive integration and batch QC in our in-house lab. The nitrile content is set here, against your medium and minimum temperature.
Mould design and CNC tool manufacture, in-house, held as a controlled record. The lip profile is the tool
Its angle and contact width set the sealing force.
Moulding and metal bonding
The elastomer is moulded and bonded to the metal case in the same operation. Margo does rubber-to-metal bonding in-house.
Lip trimming and spring fitting
The sealing edge trimmed to profile and the garter spring fitted.
Quality inspection
Lip concentricity, bore and width checked against DIN 3760, plus hardness and batch sampling.
Export packaging
Industrial packing with documentation. Seals packed to protect the lip, which is damaged by stacking. ISPM-15 treated pallets where timber is used.
Quality assurance
Certified to International Standards
Every product leaves our facility with a documentation package — material test reports, dimensional inspection sheets and a certificate of conformance — giving traceability from raw material to finished part.
ISO 9001:2015 · Certificate 09111526A
Integral Certification Ltd · Valid to 21 February 2027
Scope: rubber moulded components — quality management, not a product approval
IATF 16949 — upgrade in progress, certification targeted by end 2026
ISO 14001 and ISO 45001 — targeted 2027
Seals are made to DIN 3760 and ISO 6194 dimensions. These are dimensional standards, not certifications.
Certification detailProduction metrics
- Since 2005
- In operation
- 60+
- Active clients
- 3–4 weeks from approved sample
- Avg. lead time
Downloads
Technical Documentation
Compound datasheets and dimensioned drawings are issued on request, under NDA where required. Send shaft diameter, housing bore, width and the medium, and we will confirm the type and nitrile content against them.
Request the size chartFAQ
Technical & Commercial Questions
Answers to the most common questions from engineering teams and procurement managers worldwide.
What is the minimum order quantity for this part?
We supply in bulk. The minimum run is 10,000 pieces per part number, per compound, or quoted against the part where geometry or tooling makes that unrealistic. Prototype and first-article lots sit outside the minimum.
Can you match a competitor specification or reverse-engineer an existing part?
Yes. Send the old seal and, if you can, tell us how it failed — a hardened, cracked lip means heat or ozone, a grooved lip means abrasive contamination, and a polished band on the shaft means the shaft is the problem, not the seal. We size from the housing and the shaft, not from the worn part.
What file formats do you accept for drawings?
PDF, DWG, DXF and STEP — but a drawing is often unnecessary. Shaft diameter, housing bore, width, type A or AS, plus the medium and the temperature range is a complete specification. State the coldest start temperature separately — it sets the nitrile content.
Do you provide material test reports with each shipment?
Yes. Material test reports, dimensional inspection sheets and a certificate of conformance ship with every consignment. Hardness, tensile to ASTM D412 and compression set to ASTM D395 Method B are tested in-house, with dimensions checked against DIN 3760.
What are your payment and delivery terms for international orders?
TT and LC accepted, discussed per order. Ex-works Nashik or FOB Nhava Sheva. Commercial invoice, packing list and certificate of origin are issued with every consignment. Seals are packed to protect the sealing lip.
Same compound
Other parts we mould in the same compounds
- Angle Packing Pad — L-Section · NBR
- Compression Pump Inlays — Moulded Elastomer Inserts · NBR
- Foam Gaskets — Closed-Cell Sponge for Low-Closing-Force Seals · NBR
- Oil Filler Cap O-Rings — Moulded to ISO 3601 Sizes · NBR
- 3 Pin Hole Pad — Three-Way Electrical Pass-Through Grommet · NBR
- Rubber Support Pads — Load-Bearing and Vibration-Isolating · NBR
Guides
Further Reading
FKM vs NBR: Which Rubber Is Right for Your Application?
Compares fluorocarbon and nitrile across temperature, chemical resistance and cost-in-use — FKM −20 to +250 °C, NBR −30 to +120 °C. FKM is the answer where temperature or aggressive media demand it; NBR is the answer everywhere else, and it costs a fraction as much.
Need this part quoted?
Send shaft diameter, housing bore and width — or the old seal. Tell us the medium, the shaft speed and the coldest temperature it starts at. We confirm type, nitrile content and lip design, then quote against your annual quantity. We respond within 48 hours.