Mutual Screw & Supply

0.139" CS X 3.609" ID PTFE O-Rings | AS568-239 | Dash 239 | 23 Durometer (10 / Pkg.)

0.139" CS X 3.609" ID PTFE O-Rings | AS568-239 | Dash 239 | 23 Durometer (10 / - Main image
$39.23 $53.01 In stock

PTFE o-rings in AS568-239, 3.609" 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: 239
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 3.609" (91.67 mm)
  • Durometer: 23 Shore A
  • Temperature range: -350°F to +500°F (-212°C to +260°C)
  • Measurement type: Imperial
  • Pack quantity: 10 per package
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Standard Shipping · United States: $0.00

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)

Thomas D. ★★★★★

The 23 durometer PTFE is noticeably softer than standard o-rings, making these 239s seal beautifully on my old flanged fittings without needing excessive torque. They slide into place easily, and I'm confident they'll handle the extreme temp swings in my cryo setup.

Owen ★★★★★

These o-rings are perfect for my high-temp application; the PTFE material handles up to 500°F without any issue. The 23 durometer feels firm yet seals tightly in the groove.

Lily M. ★★★★★

Finally found o-rings that can handle the extreme heat near my furnace without degrading. The 23 durometer PTFE material feels firm yet flexible during installation. Worked perfectly for sealing a high-temp fluid line on my first try.