Mutual Screw & Supply

0.21" CS X 3.975" ID Viton FKM O-Rings | AS568-345 | Dash 345 | 75 Durometer | Black (10 / Pkg.)

0.21" CS X 3.975" ID Viton FKM O-Rings | AS568-345 | Dash 345 | 75 Durometer | - Main image
$38.75 $56.99 In stock

Viton FKM o-rings in AS568-345, 3.975" 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: 345
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 3.975" (100.97 mm)
  • Durometer: 75 Shore A
  • Color: Black
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 10 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 (4.8 / 5 · 5 reviews)

Andrew C. ★★★★★

I was worried about getting the right size for my compressor rebuild, but these matched the AS568-345 spec perfectly. The 75 durometer feels firm yet pliable, and the Viton material gives me confidence for high-temp applications.

Nicholas P. ★★★★★

These o-rings fit the older hydraulic cylinder on my press perfectly, and the 75 durometer feels nice and firm. The 400°F rating gives me confidence for the hot oil it’ll see. Just what I needed for the rebuild.

Steven G. ★★★★★

Had to replace a failed o-ring on a hot oil filter housing, and these Viton FKM rings held up perfectly at 350°F. The 75 durometer feels firm but seals tight without needing excessive force. Exactly what I needed for that application.