Mutual Screw & Supply

0.139" CS X 4.109" ID Viton FKM O-Rings | AS568-243 | Dash 243 | 75 Durometer | Brown (25 / Pkg.)

0.139" CS X 4.109" ID Viton FKM O-Rings | AS568-243 | Dash 243 | 75 Durometer | - Main image
$44.9 $59.87 In stock

Viton FKM o-rings in AS568-243, 4.109" 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: 243
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 4.109" (104.37 mm)
  • Durometer: 75 Shore A
  • Color: Brown
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 25 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 (5.0 / 5 · 5 reviews)

Ruby ★★★★★

Installed these on a hydraulic fitting that sees constant 180°F oil, and the Viton compound hasn't hardened or cracked after a month of use. The 4.109" ID fit my groove perfectly with no binding.

George ★★★★★

The 75 durometer is exactly right for my application, nice and firm without being brittle. These Viton o-rings have held up through repeated heat cycles up to 400°F with zero deformation so far.

Carter I. ★★★★★

I replaced the seals in a hot oil line that regularly sees 350°F, and these Viton o-rings held up perfectly without any softening. The 75 durometer feels just right — firm enough to seal well but not too stiff to install by hand.