Mutual Screw & Supply

0.139" CS X 4.109" ID Viton FKM O-Rings | AS568-243 | Dash 243 | X-Ring | 70 Durometer (7 / Pkg.)

0.139" CS X 4.109" ID Viton FKM O-Rings | AS568-243 | Dash 243 | X-Ring | 70 - Main image
$33.83 $52.05 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 (X-Ring)
  • Material: Viton FKM
  • AS568 dash size: 243
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 4.109" (104.37 mm)
  • Durometer: 70 Shore A
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 7 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)

Hazel ★★★★★

I needed o-rings that could handle high heat without degrading, and these FKM ones rated up to 400°F are holding up perfectly under my compressor's toughest conditions. The 70 durometer feels just right for a snug seal without being too stiff.

Jacob ★★★★★

The 0.139" cross-section fits perfectly into my pneumatic actuator ports where standard rings always slipped. Viton FKM feels noticeably stiffer than Buna, and it hasn't deformed after a week cycling between freezing and 180°F.

Penelope X. ★★★★★

Needed these for a high-temp steam line repair and they seated perfectly with no leaks. The 400°F rating gave me peace of mind for the application.