Mutual Screw & Supply

0.139" CS X 1.234" ID PTFE O-Rings | AS568-218 | Dash 218 | 21 Durometer (35 / Pkg.)

0.139" CS X 1.234" ID PTFE O-Rings | AS568-218 | Dash 218 | 21 Durometer (35 / - Main image
$39.33 $55.4 In stock

PTFE o-rings in AS568-218, 1.234" inner diameter by 0.139" cross-section. Service range -350°F to +500°F (-212°C to +260°C). Also known as Teflon, Polytetrafluoroethylene.

Specifications

  • Product type: O-Ring
  • Material: PTFE
  • AS568 dash size: 218
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 1.234" (31.34 mm)
  • Durometer: 21 Shore A
  • Temperature range: -350°F to +500°F (-212°C to +260°C)
  • Measurement type: Imperial
  • Pack quantity: 35 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 (5.0 / 5 · 5 reviews)

Brian P. ★★★★★

Exactly what I needed for a cryogenic valve rebuild. The 21 durometer is notably soft and pliable compared to standard PTFE, making installation much easier.

Joseph ★★★★★

Installed these in a high-temp oil system that usually destroys standard o-rings, and they've held up perfectly so far. The -350°F to +500°F rating gives me confidence for extreme applications. Just wish they came in a smaller pack for testing.

James Q. ★★★★★

The 21 durometer on these PTFE o-rings is way softer than the usual hard Teflon ones, which made installation a breeze in my tight groove. They sealed perfectly on my high-temp valve assembly right out of the package.