Mutual Screw & Supply

0.139" CS X 10.484" ID Buna-N Nitrile O-Rings | AS568-278 | Dash 278 | 70 Durometer | Black (35 / Pkg.)

0.139" CS X 10.484" ID Buna-N Nitrile O-Rings | AS568-278 | Dash 278 | 70 - Main image
$34.66 $55.02 In stock

Buna-N Nitrile o-rings in AS568-278, 10.484" inner diameter by 0.139" cross-section. Service range -40°F to +250°F (-40°C to +121°C). Also known as NBR, Buna-N, Chemigum, Hycar, Perbunan.

Specifications

  • Product type: O-Ring
  • Material: Buna-N Nitrile
  • AS568 dash size: 278
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 10.484" (266.29 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 35 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)

Edward K. ★★★★★

I’ve used these o-rings for a hydraulic repair and they sealed perfectly under 250°F operation. The 70 durometer hardness gives them just enough flexibility without being too soft.

Owen E. ★★★★★

These are exactly the size I needed for a custom seal in a jig I'm building, and the 70 durometer feels plenty firm for the pressure I'm running. The -40°F to +250°F range covers me through the shop's winter and summer swings, so I don't have to worry about them getting brittle.

Christopher ★★★★★

The 10.484" inner diameter fit my hydraulic cylinder perfectly, and the 70 durometer gives them just the right firmness without being too stiff. Installed without any tweaking needed.