Mutual Screw & Supply

0.21" CS X 0.412" ID Buna-N Nitrile O-Rings | AS568-309 | Dash 309 | 70 Durometer | Black (500 / Pkg.)

0.21" CS X 0.412" ID Buna-N Nitrile O-Rings | AS568-309 | Dash 309 | 70 - Main image
$39.18 $59.36 In stock

Buna-N Nitrile o-rings in AS568-309, 0.412" 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: 309
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 0.412" (10.46 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 500 per package
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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)

James T. ★★★★★

I needed o-rings that could handle both hydraulic oil and temperature swings, and these Buna-N ones with the 0.412" ID fit perfectly into my pneumatic fittings. They seat snugly without deforming, and the 70 durometer feels just right for a reliable seal.

Thomas ★★★★★

Just finished rebuilding a small hydraulic cylinder with these, and the 0.412" ID fit perfectly on the piston. The 70 durometer feels exactly right for the application, not too stiff or soft.

Miles P. ★★★★★

I needed a bulk pack of these for a pneumatic project and the 70 durometer is just right—soft enough to seal but firm enough to stay put. The 500-count box will last me years, which makes the price per ring a steal.