Mutual Screw & Supply

0.21" CS X 8.725" ID Buna-N Nitrile O-Rings | AS568-366 | Dash 366 | 70 Durometer | Black (40 / Pkg.)

0.21" CS X 8.725" ID Buna-N Nitrile O-Rings | AS568-366 | Dash 366 | 70 - Main image
$39.61 $56.59 In stock

Buna-N Nitrile o-rings in AS568-366, 8.725" 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: 366
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 8.725" (221.61 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 40 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)

George ★★★★★

The 70 durometer hardness feels solid and consistent across all 40 rings, which is great when I'm swapping them out on multiple fittings. They slide on easy but hold their shape well, and the -40°F to +250°F rating covers the range I need for my outdoor equipment.

Steven A. ★★★★★

The ID measured perfectly at 8.725 inches on my calipers, and the 70 durometer hardness feels just right for the hydraulic flange I needed to seal. Even at 200°F they haven't softened or deformed, which is exactly what I was hoping for with this Buna-N material.

Zoe ★★★★☆

The 8.725” ID fits perfectly on my hydraulic cylinder, and the 70 durometer feels firm but not brittle. I wish the package had a few more rings for the price, but they’re holding up well so far.