Hydraulic Fittings & Adapters

Manufacturer Since 2011

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6403 O Ring Unions

O Ring Unions is the connection for hydraulic systems.

  • Steel Material: Carbon Steel 45#, Japan grade S45C, America grade 1045, Germany grade C45
  • Surface Finished: Zinc Plating
    Salt Spray Test: 96 hours without red rust.

  • Stainless Steel Material: SS304, SS316, Duplex Steel or Nickel Alloy
    Surface Finished: Degreasing, Cleaning, or Passivation.

  • Packing: ends with plastic caps to avoid thread damage, pcs of fittings in polybag, then max 20kgs in carton box, max 800kgs per wooden pallet.

  • Stock available for fast shipment.

  • Mill test report: EN 10204-3.1

6403 Union Fittings Specifications

SubjectDash SizeMale O-RingMale O-Ring
640304-047/16-207/16-20
640306-049/16-187/16-20
640306-069/16-189/16-18
640308-083/4-163/4-16
640310-087/8-143/4-16
640310-107/8-147/8-14
640312-081 1/16-123/4-16
640312-101 1/16-127/8-14
640312-121 1/16-121 1/16-12
640316-121 5/16-121 1/16-12
640316-161 5/16-121 5/16-12
640320-161 5/8-121 5/16-12
640320-201 5/8-121 5/8-12
640324-201 7/8-121 5/8-12
640324-241 7/8-121 7/8-12
640332-322 1/2-122 1/2-12