Mutual Screw & Supply

0.139" CS X 0.734" ID PTFE O-Rings | AS568-210 | Dash 210 | 21 Durometer (50 / Pkg.)

0.139" CS X 0.734" ID PTFE O-Rings | AS568-210 | Dash 210 | 21 Durometer (50 / - Main image
$40.87 $58.39 In stock

PTFE o-rings in AS568-210, 0.734" 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: 210
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 0.734" (18.64 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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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)

Eva C. ★★★★★

The 0.734" inner diameter fit perfectly in my high-temp valve assembly, and the 21 durometer is firm enough to hold a seal under pressure. Handled a 400°F steam line without any softening or creep. Exactly what I needed for cryogenic cycling too.

Ava ★★★★★

I was skeptical about PTFE o-rings holding up at extreme temps, but these handled a cryogenic lab test without any cracking. The 21 durometer is noticeably pliable yet firm enough to seal perfectly.

Michael K. ★★★★★

The 21 durometer feels incredibly soft for a PTFE ring, yet it held up perfectly in my cryogenic valve application. I needed something that could handle both liquid nitrogen and steam cycles, and these haven't shown any signs of cracking after a month.