Mutual Screw & Supply

0.139" CS X 5.359" ID Buna-N Nitrile O-Rings | AS568-253 | Dash 253 | 70 Durometer | Black (80 / Pkg.)

0.139" CS X 5.359" ID Buna-N Nitrile O-Rings | AS568-253 | Dash 253 | 70 - Main image
$35.26 $51.85 In stock

Buna-N Nitrile o-rings in AS568-253, 5.359" 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: 253
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 5.359" (136.12 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 80 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)

Matthew ★★★★★

The 70-durometer material feels just right for my hydraulic cylinder rebuild—snug fit without being a struggle to install. These AS568-253 rings sealed up a stubborn leak on the first try.

Claire ★★★★★

Using these for a custom pneumatic actuator I’m building, and the 70 durometer feels just right for the seal—not too hard, not too soft. They slid on easily and hold pressure well. Exactly what I needed.

John W. ★★★★★

I needed a reliable seal for a pneumatic actuator rebuild, and the 0.139" cross-section seated perfectly in the groove without any trimming. The 70 durometer rubber has a nice firm feel that gives me confidence it'll hold up under pressure.