Mutual Screw & Supply

0.21" CS X 0.412" ID Viton FKM O-Rings | AS568-309 | Dash 309 | 75 Durometer | Brown (70 / Pkg.)

0.21" CS X 0.412" ID Viton FKM O-Rings | AS568-309 | Dash 309 | 75 Durometer | - Main image
$36.03 $53.77 In stock

Viton FKM o-rings in AS568-309, 0.412" 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: 309
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 0.412" (10.46 mm)
  • Durometer: 75 Shore A
  • Color: Brown
  • Temperature range: -15°F to +400°F (-26°C to +204°C)
  • Measurement type: Imperial
  • Pack quantity: 70 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)

Joshua ★★★★★

The 0.21" cross-section on these #309 o-rings feels noticeably sturdier than the standard ones I've used before. Fit perfectly into my high-temp manifold application where I need them to hold up past 350°F. Really solid batch for the price.

Emily O. ★★★★★

The higher temp rating was exactly what I needed for a steam seal application—no more softening at 350°F. These 75 durometer FKM rings held their shape perfectly through a 12-hour cycle.

Eva Y. ★★★★★

The 0.412" inner diameter is a perfect fit for my hydraulic system repair, and the high-temperature Viton material handles the heat without issue. The brown color also makes them easy to spot when I'm sorting through my tool box.