Mutual Screw & Supply

0.139" CS X 4.109" ID PTFE O-Rings | AS568-243 | Dash 243 | 24 Durometer (125 / Pkg.)

0.139" CS X 4.109" ID PTFE O-Rings | AS568-243 | Dash 243 | 24 Durometer (125 / - Main image
$42.99 $57.32 In stock

PTFE o-rings in AS568-243, 4.109" 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: 243
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 4.109" (104.37 mm)
  • Durometer: 24 Shore A
  • Temperature range: -350°F to +500°F (-212°C to +260°C)
  • Measurement type: Imperial
  • Pack quantity: 125 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)

Matthew H. ★★★★★

I needed a high-temp seal for a valve stem, and these PTFE rings handled the 400°F steam without any deformation. The 24 durometer is soft enough to seat perfectly but firm enough to hold pressure tight.

Lily ★★★★★

These o-rings have been working perfectly in our high-temp steam lines, the -350°F to +500°F range is exactly what we needed. They sealed tight on the first try and show no signs of wear after two weeks.

Sebastian Q. ★★★★★

Finally, an o-ring that handles my cryo line without getting brittle—the -350°F rating matched exactly what I needed. The 24 durometer is noticeably softer than standard PTFE, which made seating it in the groove a breeze.