Mutual Screw & Supply

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

0.139" CS X 6.359" ID Buna-N Nitrile O-Rings | AS568-261 | Dash 261 | 70 - Main image
$33.7 $56.16 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
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 70 per package
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Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Leo ★★★★★

The 70 durometer hardness is spot on for holding a good seal without being impossible to squeeze into place. I used these on a hydraulic cylinder rebuild and they fit the groove perfectly.

Hazel ★★★★★

The dash 261 size was exactly what I needed to rebuild the hydraulic cylinder, and the 70 durometer buna-n feels pliable yet firm enough to seat properly without distorting. I've torqued the flange down and run it up to 180°F with zero weeping, so I'm grabbing another pack for spares.

Olivia ★★★★★

The 70 durometer feels just right for my hydraulic lines, and they slid into place without any wrestling. The -40°F to +250°F rating is exactly what I needed for the compressor setup. This 70-pack will last me years.