Mutual Screw & Supply

0.21" CS X 3.725" ID Viton FKM O-Rings | AS568-343 | Dash 343 | 75 Durometer | Brown (12 / Pkg.)

0.21" CS X 3.725" ID Viton FKM O-Rings | AS568-343 | Dash 343 | 75 Durometer | - Main image
$34.16 $54.23 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: 75 Shore A
  • Color: Brown
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 12 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)

Edward ★★★★★

These fit perfectly on the high-temp steam valve I was repairing, and the 75 durometer gives them a nice firm seal without being too hard to install. The 3.725" ID was exactly right for the groove depth.

Ruby B. ★★★★★

The Viton material held up perfectly in a high-temperature application where my old Buna-N rings failed within a week. These brown 75 durometer rings are noticeably stiffer and didn't deform at all at 350°F. Exactly what I needed for that valve rebuild.

Isabella D. ★★★★★

The 3.725" inner diameter fit my hydraulic flange perfectly with no stretching or rolling during installation. I've had these in service around 250°F for three weeks now and they're holding their shape and seal without any sign of the brown hardening I've seen with cheaper rubber.