Mutual Screw & Supply

0.21" CS X 3.725" ID Viton FKM O-Rings | AS568-343 | Dash 343 | 90 Durometer (16 / Pkg.)

0.21" CS X 3.725" ID Viton FKM O-Rings | AS568-343 | Dash 343 | 90 Durometer - Main image
$35.85 $56.02 In stock

Viton FKM o-rings in AS568-343, 3.725" inner diameter by 0.21" cross-section. Service range -15°F to +400°F (-26°C to +204°C). Also known as FKM, Fluoroelastomer.

Specifications

  • Product type: O-Ring
  • Material: Viton FKM
  • AS568 dash size: 343
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 3.725" (94.61 mm)
  • Durometer: 90 Shore A
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 16 per package
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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)

Isabella X. ★★★★★

These o-rings fit perfectly on my steam valve rebuild; the 90 durometer feels noticeably stiffer than standard Buna-N, which is exactly what I needed for the high-temp service. The -15°F to +400°F range gives me confidence they'll hold up through seasonal temperature swings.

Evelyn ★★★★★

The high-temp rating is exactly what I needed for my engine bay gaskets, and these Viton O-rings handled the 350°F heat without any issue. Fit perfectly on the dash 343 spec.

Grace C. ★★★★★

These came out of the package feeling a bit stiffer than the Buna-N I usually use, but the 90 durometer and 400°F rating are exactly what I needed for a hot oil seal.