Mutual Screw & Supply

0.139" CS X 5.109" ID Viton FKM O-Rings | AS568-251 | Dash 251 | 75 Durometer | Brown (20 / Pkg.)

0.139" CS X 5.109" ID Viton FKM O-Rings | AS568-251 | Dash 251 | 75 Durometer | - Main image
$39.53 $59 In stock

Viton FKM o-rings in AS568-251, 5.109" inner diameter by 0.139" cross-section. Service range -15°F to +400°F (-26°C to +204°C). Also known as FKM, Fluoroelastomer.

Specifications

  • Product type: O-Ring
  • Material: Viton FKM
  • AS568 dash size: 251
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 5.109" (129.77 mm)
  • Durometer: 75 Shore A
  • Color: Brown
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 20 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 (4.2 / 5 · 5 reviews)

George G. ★★★★★

Installed these on a high-temp pump flange where standard Buna-N kept failing. The Viton FKM held up perfectly at 350°F, and the brown color made them easy to spot during inspection. Exactly the right cross-section for a snug seal without over-compressing.

Emily ★★★★★

The 5.109" inner diameter fit my hydraulic cylinder perfectly, and the brown Viton material feels noticeably sturdier than the old Buna-N ones I was using. I've had them in service for a few weeks with hot oil around 350°F without any issues so far.

Charlotte ★★★★★

Needed a replacement for a high-heat seal on my compressor, and these Viton rings handled the 350°F surface without any softening. The brown color made it easy to spot during install, too.