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Product image O-ring 250×5.3 EPDM 70 Shore A

OR-EPDM70-250x5-3

O-ring 250×5.3 EPDM 70 Shore A

This EPDM O-ring is the correct choice for potable water, steam, brake fluids and all applications outside mineral oils.

Product code
OR-EPDM70-250x5-3
Dimensions
250 × 5.3 mm
Material
EPDM · 70 Sh A

excl. VAT

From €2.16

€2.66 incl. VAT

Low stockPovažská Bystrica warehouse

The minimum order is €5.00 excl. VAT. For smaller orders you pay the difference as a small-order fee — add more pieces to avoid it.

In stock in Považská Bystrica — delivery 1–3 business days from dispatch (SK), 3–5 days (EU)

    Certifications

    Add 9 more pieces — from 10 pcs the price is €1.94 per piece, excl. VAT.

    Need a price for a larger volume?

    EPDM O-ring 250 × 5.3 mm (inner diameter 250 mm, cross-section 5.3 mm). Outer diameter 260.6 mm. Hardness 70 Sh A. Temperature range -40 °C to 130 °C. Standard ISO3601-250x5.3. Certifications: WRAS, KTW.

    For a static seal of this size (outer diameter 260.6 mm), the ISO 3601-2 / Parker O-Ring Handbook ORD 5700 design guidance recommends a groove depth of about 4.13 mm and a groove width of about 6.89 mm for the 5.3 mm cross-section — roughly 22 % squeeze.

    Inner diameter (ID)
    250 mm
    Cross-section (CS)
    5.3 mm
    Outer diameter (OD)
    260.6 mm
    Size
    250x5.3
    Material
    EPDM
    Hardness
    70 Sh A
    Color
    black
    Temperature range
    -40 °C to 130 °C
    Standard code
    ISO3601-250x5.3
    ISO 3601 size
    250x5.3
    Product code
    OR-EPDM70-250x5-3
    Country of origin
    Germany
    Availability
    Low stock

    Technical specifications

    Product data
    MaterialEPDM
    Hardness (Shore A)70 Sh A
    Colorblack
    CertificationsWRAS, KTW
    Indicative values for EPDM
    Temperature range-40 °C to 130 °C
    Tensile strength12 MPa
    Ultimate elongation350 %
    Compression set20 %
    Density1.15 g/cm³

    These values apply to the EPDM material family as a whole, not to this specific size and hardness. Always verify suitability for your specific application before use.

    Cross-standard size references

    Standard code
    ISO3601-250x5.3
    ISO 3601
    250x5.3
    DIN 3771
    250x5.3

    Material properties

    EPDM is an ethylene propylene diene rubber with excellent resistance to water, steam, polar solvents, glycol-based brake fluids, ester oils, ozone, UV radiation and weathering. Operating temperature range is -40 °C to +130 °C (sulfur-cured), peroxide-cured grade up to +150 °C and for steam. It is not resistant to mineral oils, fuels and most hydrocarbon oils. Available grades meet WRAS, KTW, DVGW, NSF 61 potable water approvals and EPDM-FDA for food contact.

    Material
    EPDM
    Chemical name
    Ethylene Propylene Diene Monomer
    Also known as
    EPM, ethylene-propylene
    Trade names
    Arlanxeo Keltan, Dow Nordel, Lion Elastomers Royalene

    Suitable for various industries

    EPDM O-rings are used in potable water systems, steam lines, HVAC installations, brake systems (DOT 3/4/5.1), solar assemblies, roofing applications and outdoor enclosures. Typical applications: water fittings, heat exchangers, automotive brake lines, pharmaceutical CIP/SIP (peroxide-cured).

    Application notes

    The only choice for potable water and glycol-based brake fluids (DOT). Not suitable for mineral oils or fuels — substituting NBR causes immediate failure. For steam use peroxide-cured grade.

    Advantages

    • Resistant to potable water and steam (peroxide-cured grade)
    • Compatible with glycol-based brake fluid
    • Excellent ozone, UV and weathering resistance
    • Operating range -40 °C to +130 °C
    • Available grades with WRAS, KTW, NSF 61 for drinking water

    Price tiers

    Quantityper piece
    from 1 pc€2.16
    from 10 pcs −10.2%€1.94
    from 100 pcs −25%€1.62
    from 1,000 pcs −35.2%€1.40

    Prices exclude VAT. The volume discount is applied automatically in the cart.

    Documentation

    Download datasheet (PDF)
    See all materials in size 250 × 5.3 mm

    Frequently asked questions about this O-ring

    What is the temperature range of an EPDM O-ring?
    This EPDM O-ring is rated for continuous service of roughly -40 to 130 °C. The material can withstand brief temperature peaks above this range, but near the limits service life drops significantly. If you operate at the edge of the range, ask our technician about a more suitable compound.
    What media is EPDM resistant to?
    EPDM resists water, steam, glycol-based brake fluids (DOT 3/4/5.1), and water-based chemicals, and has excellent resistance to ozone and weathering. It is, however, NOT compatible with mineral oils and fuels — for those, use NBR or FKM. For a specific medium, check compatibility in our chemical-resistance chart.
    What do the dimensions of this O-ring mean?
    The size 250 × 5.3 mm gives the inner diameter × cross section. The inner diameter must fit the groove or rod; the cross section sets the seal thickness. When replacing, do not confuse inner diameter with outer diameter. If you search by standard (AS568, ISO 3601, JIS), use our cross-reference finder.
    What does 70 Shore A hardness mean?
    A hardness of 70 Shore A expresses the stiffness of the rubber: a lower number (50–60) is softer and seals an uneven surface better, a higher one (80–90) better resists pressure and extrusion from the groove. Harder is therefore not simply better — it is a trade-off driven by pressure, groove clearance, and material: 70 ShA conforms to the surface better and seals well at standard pressures, while 80–90 ShA suits cases with higher pressure or a risk of abrasion and extrusion into the gap. Under high pressure, choose a harder material and possibly a back-up ring.

    Read the EPDM material guide