Mutual Screw & Supply

0.21" CS X 3.225" ID Buna-N Nitrile O-Rings | AS568-339 | Dash 339 | 70 Durometer | Black (150 / Pkg.)

0.21" CS X 3.225" ID Buna-N Nitrile O-Rings | AS568-339 | Dash 339 | 70 - Main image
$39.55 $64.83 In stock

Buna-N Nitrile o-rings in AS568-339, 3.225" inner diameter by 0.21" 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: 339
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 3.225" (81.91 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 150 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 (5.0 / 5 · 5 reviews)

Eva ★★★★★

I needed a bulk pack for a hydraulic repair job, and the 0.21" cross-section on these 339s seated perfectly in the groove without any rolling. The 70 durometer holds up well under the 150 PSI we run, and they arrived clean and undamaged in the package.

Abigail ★★★★★

The durometer feels exactly right for my pneumatic application—firm enough to seal without crushing. These 70-durometer o-rings seated perfectly on the first try, and the 150-count package will last me through multiple service intervals.

Madison ★★★★★

The 3.225-inch ID is spot-on for my hydraulic cylinder rebuild, no wobble or play once seated. I've used cheaper o-rings that hardened up in a season, but these held their flexibility through a brutal summer.