- SHORE A
- ±5 pts against the specified hardness
- TENSILE
- Per compound datasheet, ASTM D412
Oil Seals · Made to order
EPDM Rotary Shaft Seals — Water, Coolant and Steam
“Oil seal” is the trade name for a rotary shaft lip seal — it describes the type, not the medium. In EPDM these seal rotating shafts carrying water, coolant, steam and glycol to +140 °C. Made to DIN 3760 and ISO 6194 sizes, or to your drawing. For mineral oil, specify NBR or FKM.
- HARDNESS
- 70–80 Shore A typical for a shaft-seal lip
- TEMPERATURE
- −40 to +140 °C
- SIZE
- Shaft Ø × bore Ø × width
- TYPE
- DIN 3760 Type A (plain lip) or Type AS (with dust lip)
- MEDIUM
- Water, coolant, steam, glycol. Not mineral oil
- 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; state if a dust lip is needed
- Shaft surface finish
- The single most common cause of premature seal failure — too rough abrades the lip, too smooth carries no lubricating film
- Shaft speed
- Surface speed at the lip, not just rpm
- Case material
- Steel, stainless, or rubber-covered OD
Section drawing available on request. Send shaft diameter, housing bore and width, plus the medium, temperature and shaft speed — 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
- EPDM
- 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
- −40 to +140 °C in EPDM
- Compression Set
- Tested to 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
- Seal type
- DIN 3760 Type A or AS
- Size designation
- Shaft Ø × bore Ø × width, to DIN 3760 / ISO 6194
- Medium compatibility
- Water, coolant, steam, glycol, dilute chemicals. Not mineral oil
- Max surface speed
- Stated per application
- Shaft surface finish
- Recommended range stated 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; state if a dust lip is needed
- Shaft surface finish
- The single most common cause of premature seal failure — too rough abrades the lip, too smooth carries no lubricating film
- Shaft speed
- Surface speed at the lip, not just rpm
- Case material
- Steel, stainless, or rubber-covered OD
Available materials
Rubber Compound Options
Select the compound best suited to your operating environment and application requirements.
| Rank | Compound | Temperature | Medium it is for |
|---|---|---|---|
| THIS PAGE | EPDM | −40 to +140 °C | Water, coolant, steam, glycol, brake fluid, dilute chemicals. The water-pump and process-shaft compound. |
| Leave EPDM if… | the shaft carries mineral oil | — | Specify NBR (−30/+120 °C), the standard oil-seal compound — or FKM (−20/+250 °C) above its range, at 2–3× the cost |
| Leave EPDM if… | the medium is hot oil at 120–160 °C | — | Specify AEM — between NBR’s ceiling and FKM’s price |
| Leave EPDM if… | service is dry and above +140 °C | — | Specify silicone (−60/+220 °C). Note its weak abrasion resistance on a running shaft |
| Available | Neoprene · SBR · natural rubber | See the compound table | Available, but none is a first choice for a rotary lip seal — SBR and natural rubber have no oil resistance, and natural rubber’s abrasion advantage does not offset it here |
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
“Oil seal” is a shape, not a medium
The trade name covers every rotary shaft lip seal to DIN 3760, whatever it seals. In EPDM these run on water, coolant, steam and glycol — and not on mineral oil, which swells EPDM.
Three numbers and a letter
Shaft diameter, housing bore, width — and Type A or AS depending on whether you need a dust lip. Send those four and we can quote; a drawing is optional.
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.
The lip has to spring back
A shaft seal works because the lip recovers against its garter spring. We test compression set in-house to ASTM D395 Method B — a lip that takes a set stops sealing while it still looks perfect.
Industries served
Global Applications
Water & Fluid Management
Treatment skids, circulation and dosing pumps, mixer shafts
Pumps & Valves
Rotary shaft seals are core pump hardware
Automotive
Coolant pumps and water-circuit shafts
Heavy Industry
Gearbox and drive shafts on plant running water-based or process media
Manufacturing process
From Compound to Certification
Material compounding
Polymer blending, additive integration and batch QC in our in-house lab. The EPDM grade is set here for the medium — water, coolant, steam or glycol, never mineral oil.
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 is 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 compound 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, a grooved lip means an abrasive medium, 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 shaft speed is a complete specification. Add the shaft surface finish if you have it.
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
- Tailgate Switch Boot — Sealed Push-Button Cover · EPDM
- Air Extractor Flap — One-Way Cabin Pressure Relief · EPDM
- Slotted Packing Pad — C-Section · EPDM
- Commercial Vehicle Suspension Bump Stop · EPDM
- Rear Windscreen Glazing Rubber — SUV Platform · EPDM
- Foam Gaskets — Closed-Cell Sponge for Low-Closing-Force Seals · EPDM
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 temperature and the shaft speed. We confirm type, compound and lip design, then quote against your annual quantity. We respond within 48 hours.