Mutual Screw & Supply

0.21" CS X 5.975" ID HNBR O-Rings | AS568-355 | Dash 355 | 80 Durometer (6 / Pkg.)

0.21" CS X 5.975" ID HNBR O-Rings | AS568-355 | Dash 355 | 80 Durometer (6 / - Main image
$33.22 $50.33 In stock

HNBR o-rings in AS568-355, 5.975" inner diameter by 0.21" cross-section. Service range -40°F to +300°F (-40°C to +149°C). Also known as HSN, Highly Saturated Nitrile.

Specifications

  • Product type: O-Ring
  • Material: HNBR
  • AS568 dash size: 355
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 5.975" (151.76 mm)
  • Durometer: 80 Shore A
  • Temperature range: -40°F to +300°F (-40°C to +149°C)
  • Measurement type: Imperial
  • Pack quantity: 6 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)

Violet D. ★★★★★

I just rebuilt a hydraulic cylinder that sees steam washdown cycles, and these held up perfectly through multiple thermal swings without any hardening. The 0.21" cross-section seated firmly even in a slightly worn groove.

Scarlett W. ★★★★★

The high-temperature rating on these HNBR rings is exactly what I needed for a steam valve rebuild, and the 0.21" cross-section feels robust and consistent across all six pieces.

Charlotte ★★★★★

I needed these for a hydraulic repair and the 80 durometer feels solid—no leaks after installation. The -40°F rating gives me peace of mind for outdoor equipment in winter.