Mutual Screw & Supply

0.21" CS X 6.475" ID HNBR O-Rings | AS568-357 | Dash 357 | 80 Durometer (6 / Pkg.)

0.21" CS X 6.475" ID HNBR O-Rings | AS568-357 | Dash 357 | 80 Durometer (6 / - Main image
$32.67 $51.85 In stock

HNBR o-rings in AS568-357, 6.475" 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: 357
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 6.475" (164.46 mm)
  • Durometer: 80 Shore A
  • Temperature range: -40°F to +300°F (-40°C to +149°C)
  • Measurement type: Imperial
  • Pack quantity: 6 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)

Eva ★★★★★

Needed these for a high-temp hydraulic repair on an older machine—the HNBR material handles the heat without softening up. Fit the groove perfectly with that 0.21" cross-section, and the 80 durometer gives them a nice firm seal. Worked great so far.

Olivia ★★★★★

The 80-durometer hardness is perfect for my application—firm enough to hold pressure but still easy to seat in the groove. These handled a 250°F continuous heat cycle without any sign of hardening or cracking.

William R. ★★★★★

Used these to replace old seals on a hydraulic cylinder that sees heat cycling, and they've held up perfectly after dozens of cycles so far. The -40°F to +300°F range was exactly what I needed for the job.