Mutual Screw & Supply

0.139" CS X 5.734" ID Viton FKM O-Rings | AS568-256 | Dash 256 | X-Ring | 70 Durometer (6 / Pkg.)

0.139" CS X 5.734" ID Viton FKM O-Rings | AS568-256 | Dash 256 | X-Ring | 70 - Main image
$44.28 $59.04 In stock

Viton FKM o-rings in AS568-256, 5.734" 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: 256
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 5.734" (145.64 mm)
  • Durometer: 70 Shore A
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 6 per package
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Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

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 (4.8 / 5 · 5 reviews)

Joshua M. ★★★★★

Finally got around to replacing the o-rings on my old heat exchanger, and these FKM ones fit the groove perfectly. The 70 durometer feels solid but not overly stiff during installation.

Joseph A. ★★★★★

Used these to reseal a steam valve that kept failing with standard Buna rings. The Viton material feels noticeably stiffer during install but hasn't shown any sign of heat damage after weeks of 350°F cycles. Great fit on the AS568-256 size too.

Eva R. ★★★★★

Finally found o-rings that can handle my compressor's heat without melting. The 400°F rating gives me peace of mind, and the 6-pack is perfect for spares.