Mutual Screw & Supply

0.139" CS X 0.171" ID Buna-N Nitrile O-Rings | AS568-201 | Dash 201 | 70 Durometer | Black (1200 / Pkg.)

0.139" CS X 0.171" ID Buna-N Nitrile O-Rings | AS568-201 | Dash 201 | 70 - Main image
$35.77 $54.2 In stock

Buna-N Nitrile o-rings in AS568-201, 0.171" 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: 201
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 0.171" (4.34 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 1200 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)

Sophia A. ★★★★★

The 0.139" cross-section is exactly what I needed to replace some worn seals in a hydraulic fitting, and the 70 durometer feels just right for the pressure range. I've used Buna-N before, and these fit snugly without any leaking.

Zoe ★★★★★

Finally got these for a pneumatic seal repair and the 0.171" ID is a perfect match on the shaft. The consistency across all 1200 rings is spot on, no weird flash or out-of-round ones in the batch.

Leo ★★★★★

The 70 durometer hardness feels just right for seating firmly without cracking on installation. I’ve used these to replace worn seals on hydraulic fittings and they’ve held up through repeated heat cycles up to the 250°F rating without leaking.