Mutual Screw & Supply

0.21" CS X 12.975" ID Buna-N Nitrile O-Rings | AS568-379 | Dash 379 | 70 Durometer | Black (25 / Pkg.)

0.21" CS X 12.975" ID Buna-N Nitrile O-Rings | AS568-379 | Dash 379 | 70 - Main image
$32.93 $51.46 In stock

Buna-N Nitrile o-rings in AS568-379, 12.975" inner diameter by 0.21" cross-section. 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: 379
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 12.975" (329.56 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 25 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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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 (4.8 / 5 · 5 reviews)

Abigail ★★★★★

The 0.21" cross-section was exactly what I needed to seal a large hydraulic cylinder, and the material feels tough and durable. I've used these in temperatures around 200°F with no issues at all. They arrived well-packaged and the 25-pack was a great value.

Hannah L. ★★★★★

These fit the 70 durometer spec I needed for a heavy-duty pneumatic seal on a press. The 12.975" ID was spot on, and the Buna-N material feels durable enough for the workplace. Glad I found them in a 25-pack for future projects.

Richard ★★★★★

I needed a large o-ring for a hydraulic cylinder repair, and these fit the groove perfectly. The 70 durometer feels firm yet flexible enough to seal without forcing.