Mutual Screw & Supply

Buna-N Nitrile O-Rings | AS568-443 | Dash 443 | 70 Durometer | Black (20 / Pkg.)

Buna-N Nitrile O-Rings | AS568-443 | Dash 443 | 70 Durometer | Black (20 / Pkg.) - Main image
$36.37 $54.29 In stock

Buna-N Nitrile o-rings in AS568-443. 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: 443
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 20 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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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 (5.0 / 5 · 5 reviews)

Zoe P. ★★★★★

Finally got around to replacing the worn seals on my hydraulic setup and the 70 durometer hardness is just right for a snug fit, no leaks so far. The AS568-443 sizing matched perfectly with my groove dimensions, and the black buna-n material feels durable enough to handle the heat range up to 250°F

Samuel B. ★★★★★

I’ve been using these for a while now and they hold up great in temps down to -40°F, which matters since my workshop gets pretty cold in winter. The 70 durometer hardness gives just the right squish for sealing without deforming, and a bag of 20 lasts me months.

Daniel Y. ★★★★★

These 70 durometer o-rings fit perfectly on my pressure regulator rebuild, and the -40°F temperature range gives me confidence for outdoor use. The black finish made them easy to see against the brass fitting I was working on.