Mutual Screw & Supply

0.139" CS X 3.734" ID Buna-N Nitrile O-Rings | AS568-240 | Dash 240 | 70 Durometer | Black (200 / Pkg.)

0.139" CS X 3.734" ID Buna-N Nitrile O-Rings | AS568-240 | Dash 240 | 70 - Main image
$45.67 $62.56 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: 70 Shore A
  • Color: Black
  • 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: 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)

Harper ★★★★★

I needed a batch of these for a hydraulic cylinder rebuild, and they seated perfectly in the groove without any binding. The 3.734" inner diameter is exactly as spec'd, and the material feels durable enough for my high-temp oil applications.

Thomas Z. ★★★★★

The 70 durometer hardness feels just right for sealing a hydraulic fitting I reassembled last weekend, and the -40°F rating gives me confidence for winter use. Two hundred rings for this price means I won't be scrambling for spares anytime soon.

Alexander O. ★★★★★

Needed to replace the o-rings on an old pneumatic cylinder, and the 3.734" inner diameter matched up perfectly. The 70 durometer feels sturdy without being too hard to work into place, and the batch seems consistent.