Mutual Screw & Supply

0.139" CS X 3.484" ID PTFE O-Rings | AS568-238 | Dash 238 | 23 Durometer (10 / Pkg.)

0.139" CS X 3.484" ID PTFE O-Rings | AS568-238 | Dash 238 | 23 Durometer (10 / - Main image
$32.2 $51.94 In stock

PTFE o-rings in AS568-238, 3.484" 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: 238
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 3.484" (88.49 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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Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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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 (4.8 / 5 · 5 reviews)

Brian C. ★★★★★

I needed a chemical-resistant seal for a high-temp valve rebuild, and the 23 durometer PTFE is rigid enough to hold shape under compression but still seats properly. The package of ten gives me spares for future maintenance, which is convenient.

Carter G. ★★★★★

The -350°F low-end rating gives me peace of mind for our cryo setup, and the 23-durometer softness makes them seal nicely on worn flanges. I've already reordered a second pack.

Adam ★★★★★

These 23-durometer PTFE o-rings are noticeably softer than standard Teflon seals, which made installation into a tight gland much easier without cracking. The 3.484" inner diameter was a perfect fit for my high-temp application up to 500°F.