Mutual Screw & Supply

0.21" CS X 19.475" ID Buna-N Nitrile O-Rings | AS568-392 | Dash 392 | 70 Durometer | Black (8 / Pkg.)

0.21" CS X 19.475" ID Buna-N Nitrile O-Rings | AS568-392 | Dash 392 | 70 - Main image
$40.55 $54.8 In stock

Buna-N Nitrile o-rings in AS568-392, 19.475" 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: 392
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 19.475" (494.67 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 8 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 (4.2 / 5 · 5 reviews)

Benjamin ★★★★★

Was tightening a large pneumatic press fitting and these 19.475" ID rings seated perfectly with no binding. The 70 durometer rubber feels just right—not too stiff, not too flimsy. Made the repair in one go, which never happens.

Edward ★★★★★

Just used these for a hydraulic cylinder rebuild on a backhoe, and the 0.21" cross-section fit the groove perfectly with no pinching. The 70 durometer feels stiff enough to hold pressure but not brittle at all.

John V. ★★★★★

Those 70-durometer rings are solid for the money, and the 0.21" cross-section feels thicker than some cheap sets I've used. Handled a hot water line for a week now without any swelling at 180°F, which is plenty for my needs.