Mutual Screw & Supply

0.21" CS X 6.475" ID Buna-N Nitrile O-Rings | AS568-357 | Dash 357 | 70 Durometer | Black (50 / Pkg.)

0.21" CS X 6.475" ID Buna-N Nitrile O-Rings | AS568-357 | Dash 357 | 70 - Main image
$35.47 $58.15 In stock

Buna-N Nitrile o-rings in AS568-357, 6.475" 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: 357
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 6.475" (164.46 mm)
  • Durometer: 70 Shore A
  • Color: Black
  • Temperature range: -40°F to +250°F (-40°C to +121°C)
  • Measurement type: Imperial
  • Pack quantity: 50 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)

Adam E. ★★★★★

The 70 durometer hardness on these o-rings is exactly what I needed for a snug seal on my hydraulic fitting, and they handled the hot oil during testing without any issue. The 0.21-inch cross-section feels substantial and durable, definitely a solid upgrade from the worn-out ones I replaced.

Ryan A. ★★★★★

The 6.475-inch inner diameter fit perfectly on my hydraulic cylinder flange, and the 70 durometer feels firm yet pliable enough for a secure seal. I've used cheaper o-rings before, but these Buna-N ones seem much more durable and resistant to petroleum oils.

Natalie ★★★★★

The cross-section on these is exactly 0.21", so it seated perfectly in the groove I needed to seal on our hydraulic cylinder. After a week of use under constant pressure, no leaks or hardening at all.