Mutual Screw & Supply

Buna-N Nitrile O-Rings | AS568-431 | Dash 431 | 70 Durometer | Black (35 / Pkg.)

Buna-N Nitrile O-Rings | AS568-431 | Dash 431 | 70 Durometer | Black (35 / Pkg.) - Main image
$36.43 $50.6 In stock

Buna-N Nitrile o-rings in AS568-431. 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: 431
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 35 per package
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When it ships

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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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Delivery costs

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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Returning an item

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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 (4.6 / 5 · 5 reviews)

Riley T. ★★★★★

Finally found a reliable source for AS568-431 size rings; these fit perfectly on my hydraulic fittings. The 70 durometer feels firm yet seals tight under moderate pressure.

Aurora O. ★★★★★

I was worried about getting the right fit for a hydraulic pump rebuild, but the AS568-431 sizing was spot on. These 70 durometer rings have held up well under a constant 150°F and show no signs of hardening or cracking so far.

Daniel ★★★★★

I’m replacing old seals on a pressure regulator, and these AS568-431 rings fit perfectly—the 70 durometer feels exactly right for the job. They’ve held up fine at 200°F so far, no swelling or hardening.