Mutual Screw & Supply

0.21" CS X 9.975" ID Viton FKM O-Rings | AS568-371 | Dash 371 | 75 Durometer | Black (6 / Pkg.)

0.21" CS X 9.975" ID Viton FKM O-Rings | AS568-371 | Dash 371 | 75 Durometer | - Main image
$39.49 $56.41 In stock

Viton FKM o-rings in AS568-371, 9.975" inner diameter by 0.21" 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: 371
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 9.975" (253.36 mm)
  • Durometer: 75 Shore A
  • Color: Black
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 6 per package
Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy
If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy
Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy
Returning an item

Check the return conditions before sending anything back.

United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

View policy

Customer Reviews (5.0 / 5 · 5 reviews)

Samuel ★★★★★

Used these to replace worn seals on a hydraulic fitting that kept weeping fluid. The -15°F to +400°F range gave me confidence they'd hold up under the heat near the engine. Six in the pack meant I had spares for the next job, and they slipped on without any fuss.

Joseph ★★★★★

These sealed a stubborn leak on my hydraulic cylinder that regular Buna-Ns couldn’t handle. The 75 durometer hardness feels substantial, and I love that they’re rated up to 400°F so I don’t have to worry about heat cycling.

Lucy C. ★★★★★

Had to replace an old seal on a high-heat compressor that kept failing with standard rubber. These Viton o-rings fit perfectly and the 75 durometer feels noticeably sturdier than the originals. Running at 350°F with zero issues so far.