Mutual Screw & Supply

0.21" CS X 3.725" ID Buna-N Nitrile O-Rings | AS568-343 | Dash 343 | 70 Durometer | Black (100 / Pkg.)

0.21" CS X 3.725" ID Buna-N Nitrile O-Rings | AS568-343 | Dash 343 | 70 - Main image
$34.6 $55.81 In stock

Buna-N Nitrile o-rings in AS568-343, 3.725" 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: 343
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 3.725" (94.61 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 100 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 (4.8 / 5 · 5 reviews)

Steven G. ★★★★★

The inner diameter is spot on for my hydraulic cylinder rebuild, and the cross-section seats perfectly in the groove. These seals handled hot fluid right out of the package without any swelling.

Zoe ★★★★★

The 70 durometer feels just right for the air fitting I needed to seal — not too stiff, not too soft. These 3.725" ID rings fit perfectly and the whole pack of 100 will last me years of spares. Nice to have the exact AS568 size on hand for a change.

Victoria H. ★★★★★

Exactly the right size for replacing the seal on my air compressor's piston, and the 70 durometer gives just enough stiffness without being brittle. The 0.21" cross-section fits perfectly into the groove.