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  • 3.500" Inch Metal Nitrile Oil Seal - Specific Application 6638S
  • 3.500" Inch Metal Nitrile Oil Seal - Specific Application 6638S
  • 3.500" Inch Metal Nitrile Oil Seal - Specific Application 6638S
  • 3.500" Inch Metal Nitrile Oil Seal - Specific Application 6638S
  • 3.500" Inch Metal Nitrile Oil Seal - Specific Application 6638S
  • 3.500" Inch Metal Nitrile Oil Seal - Specific Application 6638S

    • 3.500" Inch Metal Nitrile Oil Seal - Specific Application 6638S

    National Oil Seals

    $96.31
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    SKU:
    NAT 6638S
    UPC:
    UPC 053893513133
    Weight:
    0.67 LBS
    Shaft size:
    3.500"
    Seal outer diameter:
    4.848"
    Seal width:
    0.875"
    Seal type & style:
    # (Specific application)
    Lip material:
    S (Nitrile)
    Case material:
    Redicoat® on metal case
    Temperature range:
    -35°C ~ 120°C (-30°F ~ 250°F)
    Seal series:
    6000
    Hardness:
    70 Durometer
    Denoted measurement:
    Inch
    Shown in catalog:
    Yes
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    Product Description

  • Nitrile (Lip code: S) is the most commonly used sealing material as nitrile is excellent with most mineral oils and greases.
  • Offers desirable "low swell" properties across many hydrocarbon fluid types.
  • Variations are available for use with fuels, industrial fluids and highly compounded lubricants.
  • Nitrile works in dry running applications but only for intermittent periods.
  • Some water based fluids such as certain cutting fluids, can destroy the nitrile/plain steel case bond when operating temperatures exceed 66°C (150°F)
  • Nitrile exhibits poor ozone resistance.
  • Poor resistance to lubricants containing sulphur, EP additives, or oxygenated hydrocarbons.

  • Many of Nationals metal cased seals are offered with Redi-Coat® rubberized coating which is applied over the seals bare metal case and helps fill in any minor bore imperfections upon installing the new seal.

  • Please note that not all product images are representative of the item being shown but are similar in appearance. Please refer to the seals technical specifications sheet provided in the image carousel for absolute confirmation before ordering.

    Follow this link for access to Timken's interactive, multi-vehicle, bearing & seal application database.

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    Custom Field

    Shaft size 3.500"
    Seal outer diameter 4.848"
    Seal width 0.875"
    Seal type & style # (Specific application)
    Lip material S (Nitrile)
    Case material Redicoat® on metal case
    Temperature range -35°C ~ 120°C (-30°F ~ 250°F)
    Seal series 6000
    Hardness 70 Durometer
    Denoted measurement Inch
    Shown in catalog Yes

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