Mutual Screw & Supply

0.139" CS X 6.359" ID Buna-N Nitrile O-Rings | AS568-261 | Dash 261 | Metal Detectable | 70 Durometer (11 / Pkg.)

0.139" CS X 6.359" ID Buna-N Nitrile O-Rings | AS568-261 | Dash 261 | Metal - Main image
$30.88 $51.46 In stock

Buna-N Nitrile o-rings in AS568-261, 6.359" 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: 261
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 6.359" (161.52 mm)
  • Durometer: 70 Shore A
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Metal detectable: Yes
  • Pack quantity: 11 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 (4.6 / 5 · 5 reviews)

Penelope O. ★★★★★

The -40°F rating is a lifesaver for my outdoor hydraulic repairs in winter—they seal perfectly even when it's freezing. I've tested them up to 250°F on a hot compressor line with no issues, and the 70 durometer gives just enough flex without being too soft.

Julian R. ★★★★★

The metal detectable feature gives me peace of mind on our food processing line, and the 70 durometer is firm enough to hold pressure without being too stiff. I've already used three of these o-rings on different flanges, and all sealed perfectly on the first try.

Adam O. ★★★★★

Finally found oversized o-rings that actually fit my industrial vacuum pump; the 70 durometer feels just right for a snug seal. Tested them down to -30°F in my cold storage setup and they held perfectly with zero leaks.