Mutual Screw & Supply

0.139" CS X 3.984" ID Buna-N Nitrile O-Rings | AS568-242 | Dash 242 | 90 Durometer (200 / Pkg.)

0.139" CS X 3.984" ID Buna-N Nitrile O-Rings | AS568-242 | Dash 242 | 90 - Main image
$48.37 $72.2 In stock

Buna-N Nitrile o-rings in AS568-242, 3.984" 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: 242
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 3.984" (101.19 mm)
  • Durometer: 90 Shore A
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 200 per package
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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 ★★★★★

The durometer on these o-rings is exactly what I needed for a tight seal in a hydraulic application; the 90 is noticeably firmer than the standard 70. They slid into the groove without any twisting and held pressure on the first test. A solid batch for the price.

Abigail P. ★★★★★

Used these for a high-pressure pneumatic application and the 90 durometer held up perfectly. The 3.984" inner diameter was a dead-on fit for my cylinder. I've already ordered another pack.

William P. ★★★★★

I needed a tight seal for a hydraulic application at around 180°F, and these 90 durometer rings held up perfectly without any deformation. The 200-count pack is great value, and the 3.984" ID was a spot-on fit for my flange.