Mutual Screw & Supply

0.21" CS X 5.475" ID Viton FKM O-Rings | AS568-353 | Dash 353 | 90 Durometer (12 / Pkg.)

0.21" CS X 5.475" ID Viton FKM O-Rings | AS568-353 | Dash 353 | 90 Durometer - Main image
$37.74 $52.41 In stock

Viton FKM o-rings in AS568-353, 5.475" inner diameter by 0.21" cross-section. Service range -15°F to +400°F (-26°C to +204°C). Also known as FKM, Fluoroelastomer.

Specifications

  • Product type: O-Ring
  • Material: Viton FKM
  • AS568 dash size: 353
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 5.475" (139.06 mm)
  • Durometer: 90 Shore A
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 12 per package
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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)

Ruby D. ★★★★★

Got these for a hydraulic cylinder rebuild on a press that runs hot, and the 90 durometer feels much more durable than standard Buna-N. The 5.475" ID fit perfectly on the first try, and they've held up through several cycles so far.

Stella ★★★★★

I needed a high-temp seal for a steam application, and these Viton FKM o-rings hold up perfectly at 400°F. The 5.475" inner diameter fit my groove like a glove, and the 90 durometer feels solid.

Olivia ★★★★★

The 90 durometer rating gives these o-rings a firm, positive seal without being too hard to stretch into place. I used them to replace a failing gasket on a steam valve and they’ve held up perfectly through several heat cycles. Much better than the generic ones I tried before.