Mutual Screw & Supply

0.139" CS X 5.734" ID HNBR O-Rings | AS568-256 | Dash 256 | 80 Durometer (12 / Pkg.)

0.139" CS X 5.734" ID HNBR O-Rings | AS568-256 | Dash 256 | 80 Durometer (12 / - Main image
$37.34 $56.57 In stock

HNBR o-rings in AS568-256, 5.734" inner diameter by 0.139" 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: 256
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 5.734" (145.64 mm)
  • Durometer: 80 Shore A
  • Temperature range: -40°F to +300°F (-40°C to +149°C)
  • Measurement type: Imperial
  • Pack quantity: 12 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 (4.4 / 5 · 5 reviews)

Miles P. ★★★★★

The wide 0.139" cross-section feels much more durable than the skinny o-rings I've used before, and at 80 durometer they're definitely stiff enough for a high-pressure seal. Took these for a hydraulic repair in my shop and they haven't leaked a drop so far, even with the fluid running warm.

Owen G. ★★★★★

The -40°F rating is the reason I grabbed these for a cold-weather hydraulic setup, and the 80 durometer holds its seal nicely under pressure. The 5.734" ID was exactly on spec, which saved me from having to send a set back.

Mia ★★★★★

These o-rings fit perfectly into a hydraulic cylinder I was rebuilding, and the 80 durometer feels nice and firm. The -40°F to 300°F range gives me confidence it'll hold up in my heated shop.