Mutual Screw & Supply

0.139" CS X 5.859" ID Viton FKM O-Rings | AS568-257 | Dash 257 | 75 Durometer | Brown (14 / Pkg.)

0.139" CS X 5.859" ID Viton FKM O-Rings | AS568-257 | Dash 257 | 75 Durometer | - Main image
$43.33 $57.77 In stock

Viton FKM o-rings in AS568-257, 5.859" 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: 257
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 5.859" (148.82 mm)
  • Durometer: 75 Shore A
  • Color: Brown
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 14 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 (5.0 / 5 · 5 reviews)

Evelyn U. ★★★★★

The 400°F rating is what sold me, and so far these have held up perfectly against the heat where my old seals kept failing. The brown color actually makes them easy to spot during assembly, which is a nice bonus.

Ella ★★★★★

Needed a high-temp seal for a small steam valve that kept failing, and these Viton o-rings with the 75 durometer feel noticeably firmer than the standard ones I tried before. The 5.859" ID fit perfectly into the groove, and so far no leaks after a week of cycling up to 300°F.

David ★★★★★

These hold up great in the hot oil bath on my hydraulic press, and the 75 durometer gives just the right amount of squeeze without being a pain to install. The brown Viton is clearly the real deal, not some cheap rubber that'll harden up.