Mutual Screw & Supply

0.139" CS X 3.984" ID HNBR O-Rings | AS568-242 | Dash 242 | 90 Durometer (10 / Pkg.)

0.139" CS X 3.984" ID HNBR O-Rings | AS568-242 | Dash 242 | 90 Durometer (10 / - Main image
$38.51 $51.35 In stock

HNBR o-rings in AS568-242, 3.984" inner diameter by 0.139" 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: 242
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 3.984" (101.19 mm)
  • Durometer: 90 Shore A
  • Temperature range: -40°F to +300°F (-40°C to +149°C)
  • Measurement type: Imperial
  • Pack quantity: 10 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)

Ellie Y. ★★★★★

I needed a tough o-ring for a hydraulic application that sees higher temps, and these HNBR ones fit perfectly. The 3.984" ID matched my groove exactly and the 90 durometer feels solid without being too stiff.

Andrew V. ★★★★★

The 90-durometer hardness makes these feel seriously sturdy, and they slid into the groove without any twisting. I’ve been hammering them with heat cycles up to 300°F and they haven’t lost their shape yet. Exactly what I needed for a stubborn seal that kept leaking.

Owen ★★★★★

These are the right size for the dash 242 application I needed, and the 90 durometer makes them feel reassuringly firm when seating them in the groove. The HNBR compound should handle the higher heat range without any issues. Fits perfectly and no complaints so far.