Mutual Screw & Supply

0.21" CS X 1.287" ID HNBR O-Rings | AS568-323 | Dash 323 | 80 Durometer (25 / Pkg.)

0.21" CS X 1.287" ID HNBR O-Rings | AS568-323 | Dash 323 | 80 Durometer (25 / - Main image
$33.99 $50.73 In stock

HNBR o-rings in AS568-323, 1.287" inner diameter by 0.21" cross-section. Service range -40°F to +300°F (-40°C to +149°C). Also known as HSN, Highly Saturated Nitrile.

Specifications

  • Product type: O-Ring
  • Material: HNBR
  • AS568 dash size: 323
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 1.287" (32.69 mm)
  • Durometer: 80 Shore A
  • Temperature range: -40°F to +300°F (-40°C to +149°C)
  • Measurement type: Imperial
  • Pack quantity: 25 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)

Ellie ★★★★★

Installed these on a hydraulic fitting that sees some heat cycles, and the HNBR seems to handle it much better than standard Buna-N. The fit was exactly right on a 1.287" groove, no binding or leaks.

John I. ★★★★★

The 80 durometer hardness is spot on—they feel firm but not brittle when I stretch them into place. The -40°F rating gives me confidence for my outdoor equipment that sits through harsh winters.

William ★★★★★

These fit perfectly in the hydraulic valve I was rebuilding—the 80 durometer feels just right for the high-pressure seal. I’ve used cheaper nitrile before, but these HNBR rings seem much more resistant to heat.