Mutual Screw & Supply

0.21" CS X 11.975" ID Buna-N Nitrile O-Rings | AS568-377 | Dash 377 | 70 Durometer | Black (30 / Pkg.)

0.21" CS X 11.975" ID Buna-N Nitrile O-Rings | AS568-377 | Dash 377 | 70 - Main image
$39.38 $59.67 In stock

Buna-N Nitrile o-rings in AS568-377, 11.975" inner diameter by 0.21" 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: 377
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 11.975" (304.16 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 30 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)

Joshua ★★★★★

The 11.975" inner diameter was spot-on for my flange seal, and the 70 durometer gives just enough give without squishing out. I've torqued these down twice now and they're holding up fine in hot oil service, so the -40°F to +250°F range feels legit.

Olivia ★★★★★

These o-rings fit perfectly into my hydraulic cylinder repair kit, the 0.21" cross-section is exactly what I needed. Installed a set last weekend and the seals feel dense and durable, no leaks so far.

Zoe ★★★★★

I’ve been searching forever for a seal this large that actually fits right, and the 11.975" inner diameter was spot-on for my hydraulic drum lid. The 70 durometer is firm enough to hold pressure but still squished into the groove without a fight. Shipping was quick and the 30-pack means I’ve got spa