Mutual Screw & Supply

0.21" CS X 3.6" ID HNBR O-Rings | AS568-342 | Dash 342 | 80 Durometer (10 / Pkg.)

0.21" CS X 3.6" ID HNBR O-Rings | AS568-342 | Dash 342 | 80 Durometer (10 / - Main image
$32.38 $53.96 In stock

HNBR o-rings in AS568-342, 3.6" 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: 342
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 3.6" (91.44 mm)
  • Durometer: 80 Shore A
  • Temperature range: -40°F to +300°F (-40°C to +149°C)
  • Measurement type: Imperial
  • Pack quantity: 10 per package
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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)

Elizabeth Q. ★★★★★

Installed these on a hydraulic fitting that sees some heat near the engine bay, and the HNBR material handled the 200°F fluid without any softening. The 0.21” cross-section sealed tight on the first try.

Kevin P. ★★★★★

These HNBR o-rings fit perfectly into my hydraulic cylinder rebuild, and the 80 durometer feels noticeably tougher than the old ones I pulled out. The cross-section is exactly 0.21", so they seated without any tweaking.

Ryan G. ★★★★★

The -40°F to +300°F range gave me peace of mind for a cold-weather pneumatic setup, and the 80 durometer feels just right under the wrench. Cuts cleanly, no deformation after a week of cycling.