Mutual Screw & Supply

0.139" CS X 3.609" ID Buna-N Nitrile O-Rings | AS568-239 | Dash 239 | 70 Durometer | Black (200 / Pkg.)

0.139" CS X 3.609" ID Buna-N Nitrile O-Rings | AS568-239 | Dash 239 | 70 - Main image
$38.02 $61.32 In stock

Buna-N Nitrile o-rings in AS568-239, 3.609" inner diameter by 0.139" cross-section. Service range -40°F to +250°F (-40°C to +121°C). Also known as NBR, Buna-N, Chemigum, Hycar, Perbunan.

Specifications

  • Product type: O-Ring
  • Material: Buna-N Nitrile
  • AS568 dash size: 239
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 3.609" (91.67 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 200 per package
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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.6 / 5 · 5 reviews)

David G. ★★★★★

The inner diameter of 3.609" was a perfect fit for my pump housing replacement, and the buna-n material seals tightly even with hot hydraulic oil up to 250°F. I've ordered these before and the consistency in durometer keeps my machinery running without leaks.

Hannah K. ★★★★★

The 70 durometer felt just right for the hydraulic fitting I replaced—tight seal with no leaks. For the price of a 200-pack, you can't beat this value if you're doing a full system rebuild.

Olivia S. ★★★★★

That -40°F to +250°F range is exactly what I needed for outdoor equipment, and the 70 durometer feels nicely firm without being brittle. Opened the bag and the black rings look uniform, no flash or rough edges. Bought the 200 pack so I've got spares for years.