Mutual Screw & Supply

0.139" CS X 5.984" ID Viton FKM O-Rings | AS568-258 | Dash 258 | 75 Durometer | Brown (12 / Pkg.)

0.139" CS X 5.984" ID Viton FKM O-Rings | AS568-258 | Dash 258 | 75 Durometer | - Main image
$31.71 $50.34 In stock

Viton FKM o-rings in AS568-258, 5.984" 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: 258
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 5.984" (151.99 mm)
  • Durometer: 75 Shore A
  • Color: Brown
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 12 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)

Sophia V. ★★★★★

Installed these in a hydraulic press that sees constant oil exposure and 350°F cycles—they've held up perfectly for three months now. The brown color makes them easy to spot during maintenance, and the 75 durometer feels just right for a tight seal without being too stiff.

Jacob S. ★★★★★

These orings handled a 400°F steam seal on my autoclave door without any softening, which is exactly the high-temp performance I needed. The 75 durometer feels noticeably robust compared to the generic Buna-N I replaced.

Benjamin C. ★★★★★

Needed a replacement for a high-temp seal in my compressor and these Viton rings handled the 350°F area without any issue. The 75 durometer feels just right—firm enough to hold pressure but still pliable during installation.