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Product image O-ring 4×1.2 FKM 80 Shore A

OR-FKM80-4x1-2-MS

O-ring 4×1.2 FKM 80 Shore A

This FKM (Viton) O-ring is a premium fluorocarbon rubber with excellent resistance to high temperatures, aggressive media and fuels.

SKU
OR-FKM80-4x1-2-MS
Dimensions
4 × 1.2 mm
Material
FKM · 80 Sh A

excl. VAT

From €0.07

€0.09 incl. VAT

In stockWarehouse Považská Bystrica

Minimum order is €5.00 excl. VAT. Below that you pay the difference as a top-up — add more pieces and you'll avoid it.

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

    Add 9 more pieces — from 10 pcs the price is €0.06 per piece, ex. VAT.

    Need a price for a larger volume?

    FKM O-ring 4 × 1.2 mm (inner diameter 4 mm, cross-section 1.2 mm). Outer diameter 6.4 mm. Hardness 80 Sh A. Temperature range -20 °C to 200 °C. Standard ISO3601-4x1.2.

    For a static seal of this size (outer diameter 6.4 mm), the ISO 3601-2 / Parker O-Ring Handbook ORD 5700 design guidance recommends a groove depth of about 0.94 mm and a groove width of about 1.56 mm for the 1.2 mm cross-section — roughly 22 % squeeze.

    Inner diameter (ID)
    4 mm
    Cross-section (CS)
    1.2 mm
    Outer diameter (OD)
    6.4 mm
    Dimensions
    4x1.2
    Material
    FKM
    Hardness
    80 Sh A
    Colour
    brown
    Temperature range
    -20 °C to 200 °C
    Standard code
    ISO3601-4x1.2
    ISO 3601 size
    4x1.2
    SKU
    OR-FKM80-4x1-2-MS
    Country of origin
    Germany
    Availability
    In stock

    Technical specifications

    Product data
    MaterialFKM
    Hardness (Shore A)80 Sh A
    Colorbrown
    CertificationsNo specific certifications
    Indicative values for FKM
    Temperature range-20 °C to 200 °C
    Tensile strength13 MPa
    Ultimate elongation180 %
    Compression set18 %
    Specific gravity1.85 g/cm³

    These values apply to the FKM 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
    ISO3601-4x1.2
    ISO 3601
    4x1.2
    DIN 3771
    4x1.2

    Material properties

    Fluorocarbon rubber (FKM), known by the trade name Viton, is a premium elastomer for high-temperature and chemically demanding applications. It offers very good resistance to mineral oils, aromatic hydrocarbons, fuels including biodiesel, mineral acids, hot oils, ozone and oxygen. Operating temperature range is -20 °C to +200 °C, short-term up to +230 °C. It is an OEM standard for automotive engine seals. Not suitable for amines, ketones, esters, glycol-based brake fluids, hot water and steam.

    Material
    FKM
    Chemical name
    Fluorocarbon Rubber
    Material grade
    Viton, FPM, Tecnoflon
    Trade names
    DuPont Viton, Solvay Tecnoflon, Daikin Dai-el

    Suitable for various industries

    FKM O-rings are used in engine systems, turbochargers, fuel injectors, chemical industry, oil & gas industry and aerospace. Typical applications include biodiesel fuel distribution seals, EGR systems, high-temperature hydraulic press cylinder seals, and chemical pumps.

    Application notes

    Premium choice for engine systems, biodiesel fuel distribution and chemical industry. Avoid glycol-based brake fluid and ketones. In dynamic applications monitor compression set at temperatures above +150 °C.

    Advantages

    • High thermal resistance up to +200 °C (short-term +230 °C)
    • Resistant to fuels, mineral oils and aromatic hydrocarbons
    • Resistant to ozone, oxygen and UV radiation
    • Low compression set at elevated temperatures
    • OEM standard for automotive engine seals

    Price tiers

    When buyingper piece
    from 1 pcs€0.07
    from 10 pcs −14.3%€0.06
    from 100 pcs −28.6%€0.05
    from 1000 pcs −42.9%€0.04

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

    Documentation

    Download datasheet (PDF)
    See all materials in size 4 × 1.2 mm

    Related products

    Equivalents, alternative materials, and cross-references.

    Same size — different material
    In stock

    O-ring 4×1.2 NBR 70 Shore A

    Dimensions
    4 × 1.2 mm · OD 6.4 mm
    Material
    NBR · 70 ShA

    SKU OR-NBR70-4x1-2-RB51274

    €0.07excl. VAT

    Same size — different material
    On demand

    O-ring 4×1.2 EPDM 70 Shore A

    Dimensions
    4 × 1.2 mm · OD 6.4 mm
    Material
    EPDM · 70 ShA

    SKU OR-EPDM70-4x1-2-RB53041

    €0.08excl. VAT

    Frequently asked questions about this O-ring

    What is the temperature range of a FKM O-ring?
    This FKM O-ring is rated for continuous service of roughly -20 to 200 °C. The material tolerates brief temperature peaks higher, 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 FKM resistant to?
    FKM (also known as Viton) is a fluorocarbon rubber for high temperatures and aggressive media — it resists mineral and hot oils, fuels including biodiesel, aromatic hydrocarbons, mineral acids, and ozone, which makes it the OEM standard for engine seals. It is not suited to hot water and steam, glycol-based brake fluids, amines, ammonia, ketones, or esters — for steam and glycol brake fluids choose EPDM, for amines and bases FEPM. For a specific medium, check compatibility in our chemical-resistance chart.
    What do the dimensions of this O-ring mean?
    The size 4 × 1.2 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 80 Shore A hardness mean?
    A hardness of 80 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 — polyurethane being the typical example. Under high pressure, choose a harder material and possibly a back-up ring.

    Read the FKM material guide