Mutual Screw & Supply

0.139" CS X 3.484" ID Viton FKM O-Rings | AS568-238 | Dash 238 | X-Ring | 70 Durometer (8 / Pkg.)

0.139" CS X 3.484" ID Viton FKM O-Rings | AS568-238 | Dash 238 | X-Ring | 70 - Main image
$32.51 $50.02 In stock

Viton FKM o-rings in AS568-238, 3.484" inner diameter by 0.139" cross-section. Service range -15°F to +400°F (-26°C to +204°C). Also known as FKM, Fluoroelastomer.

Specifications

  • Product type: O-Ring (X-Ring)
  • Material: Viton FKM
  • AS568 dash size: 238
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 3.484" (88.49 mm)
  • Durometer: 70 Shore A
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 8 per package
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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)

Ava T. ★★★★★

The 70 durometer hardness is spot-on for my application—firm enough to hold pressure but still easy to seat in the groove. I've had them on a pump flange running near 300°F for two weeks now with zero weeping, and the Viton's clearly living up to its 400°F rating.

Natalie ★★★★★

The high temperature range is exactly what I needed for a steam valve rebuild. These Viton o-rings fit perfectly and the 70 durometer feels sturdy without being too hard to seat.

Zoe ★★★★★

Installed these in a hydraulic fitting that sees constant heat cycles, and the Viton material holds up way better than the standard Buna-N rings I used before. They seated nicely without pinching, and the 70 durometer feels firm but not brittle. Perfect fit for my application.