Mutual Screw & Supply

0.139" CS X 6.359" ID Viton FKM O-Rings | AS568-261 | Dash 261 | X-Ring | 70 Durometer (5 / Pkg.)

0.139" CS X 6.359" ID Viton FKM O-Rings | AS568-261 | Dash 261 | X-Ring | 70 - Main image
$33.53 $53.22 In stock

Viton FKM o-rings in AS568-261, 6.359" 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 (X-Ring)
  • Material: Viton FKM
  • AS568 dash size: 261
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 6.359" (161.52 mm)
  • Durometer: 70 Shore A
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 5 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)

Avery Q. ★★★★★

These fit perfectly on the hydraulic cylinder I'm rebuilding, and the 400°F rating gives me peace of mind for the hot oil it'll be seeing. The 70 durometer feels just right—not too stiff, not too soft.

James J. ★★★★★

I needed exact replacement o-rings for a high-temp application and these Viton FKM rings handled the 350°F environment without any issues. The tight 0.139" cross-section gave a perfect seal on my flange.

Elizabeth ★★★★★

The 70 durometer feels just right for my steam system application—not too stiff, not too soft. These Viton rings seated perfectly and haven't budged despite the 400°F cycling.