Mutual Screw & Supply

0.139" CS X 1.421" ID PTFE O-Rings | AS568-221 | Dash 221 | 21 Durometer (35 / Pkg.)

0.139" CS X 1.421" ID PTFE O-Rings | AS568-221 | Dash 221 | 21 Durometer (35 / - Main image
$33.24 $55.4 In stock

PTFE o-rings in AS568-221, 1.421" 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: 221
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 1.421" (36.09 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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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 (5.0 / 5 · 5 reviews)

Sophia ★★★★★

These seals survived my batch of hot solvent tests without swelling or deforming, which my old rubber ones never did. The PTFE’s wide -350°F to +500°F range gave me real peace of mind for both ends of my process.

Charlotte ★★★★★

I needed a soft seal for a cryogenic fitting that sees extreme temperature swings, and these PTFE o-rings handled the -350°F test without any cracking or leaking. The 21 durometer is noticeably more pliable than standard Teflon, making installation on the 1.421" ID groove much easier than I expected

Joshua C. ★★★★★

This is the first time I’ve used a 21 durometer PTFE seal and it’s noticeably more pliable than the standard 75 durometer ones I’m used to. The inner diameter of 1.421" fit perfectly on my flange.