Mutual Screw & Supply

0.139" CS X 4.984" ID Buna-N Nitrile O-Rings | AS568-250 | Dash 250 | 70 Durometer | Black (80 / Pkg.)

0.139" CS X 4.984" ID Buna-N Nitrile O-Rings | AS568-250 | Dash 250 | 70 - Main image
$35.61 $50.87 In stock

Buna-N Nitrile o-rings in AS568-250, 4.984" 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: 250
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 4.984" (126.59 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 80 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)

Jason G. ★★★★★

The 70 durometer hardness is exactly what I needed for a snug seal, and the -40°F to +250°F range gives me peace of mind for outdoor equipment. I've already burned through half the pack on various fittings, and every single one seated perfectly on the first try.

Christopher K. ★★★★★

I needed a reliable seal for a hydraulic cylinder rebuild and these o-rings fit perfectly, the 4.984" ID was spot on. No leaks after a week of use, and the 70 durometer gives just the right amount of compression without being too stiff.

Thomas I. ★★★★★

The 70 durometer feels just right for my air line fittings—not too stiff, not too soft. I've used these in a few pneumatic applications now and they seal perfectly without any leaks. For the price per pack, this was a solid buy.