Mutual Screw & Supply

0.21" CS X 3.975" ID HNBR O-Rings | AS568-345 | Dash 345 | 90 Durometer (5 / Pkg.)

0.21" CS X 3.975" ID HNBR O-Rings | AS568-345 | Dash 345 | 90 Durometer (5 / - Main image
$36.36 $50.5 In stock

HNBR o-rings in AS568-345, 3.975" 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: 345
  • Cross-section: 0.21" (5.33 mm)
  • Inner diameter: 3.975" (100.97 mm)
  • Durometer: 90 Shore A
  • Temperature range: -40°F to +300°F (-40°C to +149°C)
  • Measurement type: Imperial
  • Pack quantity: 5 per package
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Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.6 / 5 · 5 reviews)

Edward ★★★★★

The 90 durometer feels noticeably firmer than the standard 70 I've used, perfect for my high-temp hydraulic application. They seat well and the 3.975" ID is spot on for the groove, no leaks so far.

Alexander A. ★★★★★

The included size matches the AS568-345 spec exactly, and the 90 durometer gives them a firm feel that’s easy to seat without twisting. Worked fine for a hydraulic fitting repair I did over the weekend, though the package of five is a bit small if you’re doing a full rebuild.

Eli M. ★★★★★

Finally found these in the thicker cross-section for my hydraulic press—they fit the groove perfectly and the 90 durometer feels seriously durable.