Mutual Screw & Supply

0.139" CS X 3.109" ID Buna-N Nitrile O-Rings | AS568-235 | Dash 235 | 50 Durometer (80 / Pkg.)

0.139" CS X 3.109" ID Buna-N Nitrile O-Rings | AS568-235 | Dash 235 | 50 - Main image
$34.13 $56.88 In stock

Buna-N Nitrile o-rings in AS568-235, 3.109" 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: 235
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 3.109" (78.97 mm)
  • Durometer: 50 Shore A
  • 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 (5.0 / 5 · 5 reviews)

Thomas ★★★★★

I needed o-rings that could handle both hot oil and cold weather in my hydraulic system, and these are holding up perfectly at -40°F. The 50-durometer material is soft enough to seal well without being too stiff to install.

Thomas H. ★★★★★

The fit was spot-on for my air compressor rebuild—3.109" ID matched perfectly. Sealed tight on the first test, and the 50 durometer feels pliable enough to last.

Ella ★★★★★

The 50 durometer hardness makes these o-rings surprisingly forgiving during install, and the 3.109" ID fit my housing perfectly with no fighting. I've used cheaper packs before, but these held their shape through a hot cycle with zero leaks.