Mutual Screw & Supply

0.139" CS X 0.859" ID PTFE O-Rings | AS568-212 | Dash 212 | 21 Durometer (50 / Pkg.)

0.139" CS X 0.859" ID PTFE O-Rings | AS568-212 | Dash 212 | 21 Durometer (50 / - Main image
$35.03 $58.39 In stock

PTFE o-rings in AS568-212, 0.859" 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: 212
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 0.859" (21.82 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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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 (4.4 / 5 · 5 reviews)

Hazel E. ★★★★★

Wasn't sure how flexible a 21 durometer PTFE ring would feel, but these seals handled a tight gland perfectly without cracking. The -350°F lower limit gives me confidence for our cryo test rig.

Carter F. ★★★★★

Finally got these installed on a high-temp valve that kept killing standard rubber seals — the PTFE is holding up perfectly at 400°F with zero hardening, and the 21 durometer still gives enough flexibility for a snug fit.

Ella Y. ★★★★☆

These o-rings handled the 400°F sterilization cycle in our lab press without any deformation. The 50-pack is great value for testing, though the 21 durometer is noticeably stiffer than standard rubber seals.