Mutual Screw & Supply

Buna-N Nitrile O-Rings | AS568-421 | Dash 421 | 70 Durometer | Black (50 / Pkg.)

Buna-N Nitrile O-Rings | AS568-421 | Dash 421 | 70 Durometer | Black (50 / Pkg.) - Main image
$41.27 $61.6 In stock

Buna-N Nitrile o-rings in AS568-421. 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: 421
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 50 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 (4.8 / 5 · 5 reviews)

Aurora ★★★★★

Had to swap out a worn seal on a pneumatic line rated for high heat, and these AS568-421 rings handled the install without any fuss. The 70 durometer is firm enough to seat properly but still flexible for a tight fit. Good to have a 50-pack on hand for future jobs.

Scarlett ★★★★★

The durometer feels just right for my hydraulic application, and the temperature rating gives me peace of mind. These fit perfectly and sealed on the first try.

Ruby ★★★★★

These fit perfectly on the 421 dash size fitting I needed, and the Buna-N material seems plenty durable for my pneumatic setup. The 70 durometer hardness was just right for a snug seal without being too stiff.