Mutual Screw & Supply

0.139" CS X 3.734" ID Buna-N Nitrile O-Rings | AS568-240 | Dash 240 | 50 Durometer (70 / Pkg.)

0.139" CS X 3.734" ID Buna-N Nitrile O-Rings | AS568-240 | Dash 240 | 50 - Main image
$33.28 $54.56 In stock

Buna-N Nitrile o-rings in AS568-240, 3.734" 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: 240
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 3.734" (94.84 mm)
  • Durometer: 50 Shore A
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 70 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 (4.8 / 5 · 5 reviews)

Brian E. ★★★★★

The 50 durometer is noticeably softer than the standard 70, which made seating these o-rings in tight grooves much easier. They fit perfectly on my air compressor valve rebuild, and the 70-pack should last me years.

Emma ★★★★★

Needed to replace the old hydraulic seals on my press, and these fit perfectly with that 3.734-inch ID. The 50 durometer feels just right—soft enough to seat easily, but still holds up under pressure.

Hannah ★★★★★

The 3.734-inch inner diameter fits my hydraulic cylinder perfectly, and the 70-piece pack gives me plenty of spares for future repairs. These o-rings feel durable and have held up well under hot oil conditions so far.