Mutual Screw & Supply

0.21" CS X 6.225" ID HNBR O-Rings | AS568-356 | Dash 356 | 80 Durometer (6 / Pkg.)

0.21" CS X 6.225" ID HNBR O-Rings | AS568-356 | Dash 356 | 80 Durometer (6 / - Main image
$36.79 $51.1 In stock

HNBR o-rings in AS568-356, 6.225" 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: 356
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 6.225" (158.11 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 · 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)

Madison J. ★★★★★

I was a bit worried about high-temp sealing in my hydraulic system, but these HNBR o-rings handle the 300°F rating perfectly. The 80 durometer feels firm enough to hold a solid seal without being impossible to install.

Olivia O. ★★★★★

The -40°F low-temp rating is what sold me, and after a winter of outdoor use these seals haven’t hardened or cracked at all. The 0.21" cross-section feels robust, and the six-pack was exactly what I needed for a full rebuild.

Joshua ★★★★★

I’ve had these in the freezer at -30°F for a few weeks now and they still seal perfectly after several cycles, which is exactly what I needed for a cold-line repair. The 80 durometer density makes them feel plenty sturdy without being a struggle to snap into the groove.