Mutual Screw & Supply

0.139" CS X 3.859" ID Buna-N Nitrile O-Rings | AS568-241 | Dash 241 | 90 Durometer (125 / Pkg.)

0.139" CS X 3.859" ID Buna-N Nitrile O-Rings | AS568-241 | Dash 241 | 90 - Main image
$40.91 $55.29 In stock

Buna-N Nitrile o-rings in AS568-241, 3.859" 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: 241
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 3.859" (98.02 mm)
  • Durometer: 90 Shore A
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 125 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 (4.2 / 5 · 5 reviews)

Ryan ★★★★★

Was looking for a large o-ring to replace a leaky gasket on my home air compressor, and these nitrile ones handled the 150 psi without any issues. The 3.859" inner diameter fit snugly into the groove, and the package of 125 gives me plenty of spares for future repairs.

Hazel P. ★★★★☆

The 90 durometer hardness makes these feel sturdier than the softer rings I've used before, which is exactly what I needed for a higher-pressure seal. They seated properly and haven't shown any signs of wear after a few weeks of use, though I do wish they came in smaller bulk quantities.

Chloe F. ★★★★☆

These o-rings fit perfectly on a hydraulic ram repair I was doing. The 90 durometer feels sturdier than the old ones, and the -40°F rating gives me confidence for cold weather. Only minor thing is the package count was right but the bag had a small tear.