Mutual Screw & Supply

Buna-N Nitrile O-Rings | AS568-440 | Dash 440 | 70 Durometer | Black (20 / Pkg.)

Buna-N Nitrile O-Rings | AS568-440 | Dash 440 | 70 Durometer | Black (20 / Pkg.) - Main image
$37.35 $51.17 In stock

Buna-N Nitrile o-rings in AS568-440. 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: 440
  • 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 (4.6 / 5 · 5 reviews)

Emily U. ★★★★★

The 70 durometer hardness feels just right for my hydraulic cylinder rebuild, and the -40°F rating gives me confidence for winter use. A perfect fit for the AS568-440 groove without any struggle.

Ellie O. ★★★★★

I was pleasantly surprised how snug these o-rings fit in a fuel system repair I did last weekend. They held up perfectly even when the engine got hot, which is exactly what I needed for that application.

Penelope ★★★★★

These seals worked perfectly on a hydraulic cylinder I was rebuilding, and the 70 durometer feels just right for a tight fit without being too stiff. The temperature range is wide enough for my shop's needs, so I'm confident they'll hold up.