AS568-015 SN70 (NBR) Buna-N 70 Duro Square O-Ring

Square O-Rings - Square Cut Washer Rings

Square-rings are square cross-section seals designed to be interchangeable with standard AS568 O-Rings. Complete interchangeability within standard glands is assured in most applications.

Square rings are closed circular rings of a square cross-section. They are made through vulcanisation from form tools as a complete ring. The sealing function of the Square ring is achieved by the deformation of the cross-section when installed and compressed in its housing. The Square ring can be compressed either radially or axially in its installation housing. In operating conditions the pressure exerted by the media reinforces the sealing function, as under pressure the elastomer material functions as a non-compressible fluid.

Buna-N O-Rings 70 Duro (NBR):

The most commonly used elastomer for sealing products. Nitrile, also known as Buna-N or NBR, is a copolymer of Butadiene and Acrylonitirle. It has a temperature range of -40F to +250F and is exceptionally resistant to petroleum base oils and hydrocarbon fuels. Nitrile materials also exhibit excellent tensile strength and abrasion resistance properties. The material performs well with most dilute acids, silicone oils and lubricants and in water applications. It is not recommended for use with ketones, aromatic hydrocarbons and phosphate ester hydraulic fluids. More than 50% of the Orings sold are Nitrile Orings, commonly used in hydraulic/pneumatic motors, cylinders, pumps and valves.

Buna-N / Nitrile Recommended uses:

  • General purpose sealing.
  • Petroleum oils and fluids.
  • Gasoline
  • Hydraulic fluids
  • L.P. gases
  • Cold Water.
  • Silicone greases and oils
  • Di-ester base lubricants (MIL-L-7808).
  • Ethylene glycol base fluids (Hydrolubes)

Nitrile is not recommended for:

  • Halogenated hydrocarbons (carbon tetrachloride, trichloroethylene)
  • Nitro hydrocarbons (nitrobenzene, aniline)
  • Phosphate ester hydraulic fluids (Skydrol, Fyrquel, Pydraul).
  • Ketones (MEK, acetone)
  • Ozone
  • Sunlight, UV
  • Weather
  • Strong Acids Ozone
  • Automotive brake fluid

Compound Info:

  • A general purpose, sulfur-cured Nitrile (Buna-N) compound
  • Color: Black
  • Duro: 70
  • FDA: No
  • M2BG 710 B14 B34 EA14 EO14 EO34 EF11 EF21 F17

Operating temperature: -40°F to +250°F (-40°C to +121°C)


Qty Discounts Prices
  • Model: SN70015
    Dimensions: 9/16"ID X 11/16"OD X 1/16"CS
    0.551"ID X 0.683"OD X 0.066"CS
    14mm ID X 17.36mm OD X 1.68mm CS
  • PDF Data Sheet
  • 29,424 in Stock
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