Mutual Screw & Supply

0.139" CS X 4.734" ID Buna-N Nitrile O-Rings | AS568-248 | Dash 248 | 70 Durometer | Black (125 / Pkg.)

0.139" CS X 4.734" ID Buna-N Nitrile O-Rings | AS568-248 | Dash 248 | 70 - Main image
$34.16 $56.94 In stock

Buna-N Nitrile o-rings in AS568-248, 4.734" 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: 248
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 4.734" (120.24 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 125 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 ★★★★★

Needed to replace a worn seal in a hydraulic setup and these hit the -40°F to +250°F range my application calls for. The 70 durometer feels firm enough to hold pressure without being a pain to seat. Good to have the whole 125 pack for future jobs.

Owen ★★★★★

The cross-section is spot on at 0.139" and the 70 durometer feels firm but not brittle when I seat them. I've had these on a pump flange for three weeks with zero leaks, even with the fluid sitting around 180°F. And 125 in a pack means I've got spares for the next rebuild.

Sophia ★★★★★

Installed these on a few hydraulic fittings and they seated perfectly with no leaks—the 70 durometer hardness feels just right for a tight seal. Nice to have 125 in the pack so I’ve got plenty of spares for future repairs.