Mutual Screw & Supply

0.139" CS X 0.796" ID PTFE O-Rings | AS568-211 | Dash 211 | 21 Durometer (50 / Pkg.)

0.139" CS X 0.796" ID PTFE O-Rings | AS568-211 | Dash 211 | 21 Durometer (50 / - Main image
$43.21 $58.39 In stock

PTFE o-rings in AS568-211, 0.796" 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: 211
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 0.796" (20.22 mm)
  • Durometer: 21 Shore A
  • Temperature range: -350°F to +500°F (-212°C to +260°C)
  • Measurement type: Imperial
  • Pack quantity: 50 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)

Abigail ★★★★★

The chemical resistance of these PTFE rings is exactly what I needed for a harsh solvent application. They installed easily and have held their seal perfectly after several thermal cycles from -100°F to 300°F.

Timothy ★★★★★

Finally, o-rings that don't deform after a hot oil bath — the PTFE holds up exactly as promised at 500°F. The 21-durometer feel is just pliable enough to seat perfectly in my sealing groove without being flimsy.

Kevin S. ★★★★★

Used these to seal a vacuum chamber fitting and they held perfectly down to 5 microns, which I honestly didn’t expect from PTFE. The -350°F temp range gives me confidence for cryo experiments I’ve got planned next month.