Skip to main content
oringy.sk
Product image O-ring 108.7×8.6 PU 90 Shore A

OR-PU90-108-7x8-6-MS

O-ring 108.7×8.6 PU 90 Shore A

This PU polyurethane O-ring delivers top-tier abrasion resistance — the first choice for hydraulic rod seals and high-cycle applications.

SKU
OR-PU90-108-7x8-6-MS
Dimensions
108.7 × 8.6 mm
Material
PU · 90 Sh A

excl. VAT

From €4.45

€5.47 incl. VAT

Low stockWarehouse Považská Bystrica

In stock in Považská Bystrica — delivery 1–2 business days (SK), 3–5 days (EU)

    Need a price for a larger volume?

    PU O-ring 108.7 × 8.6 mm (inner diameter 108.7 mm, cross-section 8.6 mm). Outer diameter 125.9 mm. Hardness 90 Sh A. Temperature range -40 °C to 80 °C. Standard ISO3601-108.7x8.6.

    For a static seal of this size (outer diameter 125.9 mm), the ISO 3601-2 / Parker O-Ring Handbook ORD 5700 design guidance recommends a groove depth of about 6.71 mm and a groove width of about 11.18 mm for the 8.6 mm cross-section — roughly 22 % squeeze.

    Inner diameter (ID)
    108.7 mm
    Cross-section (CS)
    8.6 mm
    Outer diameter (OD)
    125.9 mm
    Dimensions
    108.7x8.6
    Material
    PU
    Hardness
    90 Sh A
    Colour
    amber
    Temperature range
    -40 °C to 80 °C
    Standard code
    ISO3601-108.7x8.6
    ISO 3601 size
    108.7x8.6
    SKU
    OR-PU90-108-7x8-6-MS
    Country of origin
    DE
    Availability
    Limited stock

    Technical specifications

    MaterialPU
    Shore hardness90 Sh A
    Coloramber
    Temperature range-40 °C to 80 °C
    Tensile strength35 MPa
    Ultimate elongation450 %
    Compression set25 %
    Specific gravity1.25 g/cm³
    CertificationsNo specific certifications

    Cross-standard size references

    Standard code
    ISO3601-108.7x8.6
    ISO 3601
    108.7x8.6
    DIN 3771
    108.7x8.6

    Material properties

    Polyurethane (PU) is a thermoplastic elastomer with the highest abrasion resistance of all elastomers. It combines high tensile strength (typically 35 MPa), good resistance to mineral oils, cold water and lubricants. Operating temperature range is limited: -40 °C to +80 °C (short-term +100 °C). The main limitation is hydrolysis on contact with hot water or steam — PU must not be used there. Typical hardness 85-95 Shore A for dynamic sealing applications with high pressure loads.

    Material
    PU
    Chemical name
    Polyurethane Rubber
    Material grade
    Polyuretán, PUR, Urethane
    Trade names
    Covestro Vulkollan, Lanxess Adiprene, Era Polymers

    Suitable for various industries

    PU O-rings are used in hydraulic presses, construction and mining equipment, pneumatic cylinders with high cycle loads, and in abrasive environments (slurry, sand). Typical areas: rod seals, wipers, slide bands, shaft covers in high-pressure environments.

    Application notes

    Ideal for hydraulic rod seals and high-cycle applications with mineral oil. Do not use above +80 °C or with hot water / steam — material hydrolysis.

    Advantages

    • Highest abrasion resistance of any elastomer
    • High tensile strength (≈35 MPa)
    • Resistant to mineral oils and HLP hydraulic fluids
    • Suitable for high pressures (up to 40 MPa static)
    • First choice for rod and piston seals

    Need a price for a larger volume?

    Request a quote

    Documentation

    Download datasheet (PDF)
    See all materials in size 108.7 × 8.6 mm

    Frequently asked questions about this O-ring

    What is the temperature range of a PU O-ring?
    This PU O-ring is rated for continuous service of roughly -40 to 80 °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 PU resistant to?
    PU belongs to the nitrile/polyurethane family — it resists mineral oils, fuels, and hydraulic fluids, which is why it is the standard in engineering and hydraulics. It is not suited to ozone, strong acids, or polar solvents. For a specific medium, check compatibility in our chemical-resistance chart.
    What do the dimensions of this O-ring mean?
    The size 108.7 × 8.6 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 90 Shore A hardness mean?
    A hardness of 90 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. For most common applications the optimum is around 70 Shore A. Under high pressure, choose a harder material and possibly a back-up ring.

    Read the PU material guide