Mutual Screw & Supply

0.21" CS X 4.225" ID Buna-N Nitrile O-Rings | AS568-347 | Dash 347 | 70 Durometer | Black (50 / Pkg.)

0.21" CS X 4.225" ID Buna-N Nitrile O-Rings | AS568-347 | Dash 347 | 70 - Main image
$34.94 $51.38 In stock

Buna-N Nitrile o-rings in AS568-347, 4.225" inner diameter by 0.21" 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: 347
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 4.225" (107.31 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 50 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 (4.6 / 5 · 5 reviews)

Ruby Z. ★★★★★

The 4.225" inner diameter matched my pump housing perfectly on the first try, no wrestling or forcing needed. These 70 durometer rings feel firm but press in smoothly, and the -40°F to +250°F range gives me confidence for year-round outdoor gear.

Owen ★★★★★

Finally, an o-ring that actually fits the groove without me fighting it to seat properly. The 70 durometer hardness feels just right for my hydraulic fittings, and the -40°F rating gives me peace of mind for winter use.

Olivia B. ★★★★★

I swapped out an old gasket on my hydraulic press with one of these 347 o-rings and the 0.21" cross-section sealed perfectly under pressure. The -40°F to +250°F rating gives me peace of mind for winter use in my unheated shop.