Mutual Screw & Supply

0.139" CS X 4.359" ID Buna-N Nitrile O-Rings | AS568-245 | Dash 245 | 70 Durometer | Black (125 / Pkg.)

0.139" CS X 4.359" ID Buna-N Nitrile O-Rings | AS568-245 | Dash 245 | 70 - Main image
$39.72 $54.41 In stock

Buna-N Nitrile o-rings in AS568-245, 4.359" inner diameter by 0.139" 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: 245
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 4.359" (110.72 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 125 per package
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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 (4.6 / 5 · 5 reviews)

Ryan P. ★★★★★

These 70-durometer o-rings seated perfectly in my compressor's air intake flange, and the 0.139" cross-section gave just the right compression for a leak-free seal. I've already ordered another bag for spares.

Charlotte T. ★★★★★

I needed a reliable seal for a hydraulic cylinder I'm rebuilding, and these Buna-N rings fit the groove perfectly without any distortion. The durometer feels just right for a snug seal that won't deform under pressure.

Madison ★★★★★

The fit on these AS568-245 o-rings is spot-on for my hydraulic cylinder rebuild, and the 70 durometer feels just right. I appreciate that they're rated for up to 250°F, which gives me confidence in hot applications. The pack of 125 is more than enough for several jobs.