Mutual Screw & Supply

0.21" CS X 20.475" ID Buna-N Nitrile O-Rings | AS568-394 | Dash 394 | 70 Durometer | Black (8 / Pkg.)

0.21" CS X 20.475" ID Buna-N Nitrile O-Rings | AS568-394 | Dash 394 | 70 - Main image
$34.91 $56.3 In stock

Buna-N Nitrile o-rings in AS568-394, 20.475" 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: 394
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 20.475" (520.07 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 8 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 (4.8 / 5 · 5 reviews)

Abigail ★★★★★

Installed these on a hydraulic ram that kept leaking; the 20.475" ID was a perfect match and the buna-n material handles the hydraulic fluid like a champ.

John ★★★★★

The temperature range is a huge plus for my outdoor equipment, and the fit on my custom manifold was spot-on. These 70-durometer rings handled the pressure test without a single leak, and eight per pack is a solid value.

Riley ★★★★★

Installed these on a large hydraulic cylinder and the 70 durometer felt just right—firm enough to seal without being a struggle to fit. The 20.475" ID matched perfectly, no guessing.