Mutual Screw & Supply

0.139" CS X 0.859" ID HNBR O-Rings | AS568-212 | Dash 212 | 80 Durometer (70 / Pkg.)

0.139" CS X 0.859" ID HNBR O-Rings | AS568-212 | Dash 212 | 80 Durometer (70 / - Main image
$33.88 $54.65 In stock

HNBR o-rings in AS568-212, 0.859" 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: 212
  • Cross-section: 0.139" (3.53 mm)
  • Inner diameter: 0.859" (21.82 mm)
  • Durometer: 80 Shore A
  • Temperature range: -40°F to +300°F (-40°C to +149°C)
  • Measurement type: Imperial
  • Pack quantity: 70 per package
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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 (4.4 / 5 · 5 reviews)

Jason I. ★★★★★

I’ve been using these in a hydraulic application at around 250°F, and they haven’t hardened or cracked like the previous Buna-N ones did. The -40°F to 300°F service range gives me confidence they’ll hold up through temperature swings. Good value for the 70-pack.

Sophia A. ★★★★★

The 0.139" cross-section on these is noticeably firmer than standard Buna-N, which works perfectly for sealing high-temp compressor applications. I've had them in service for a couple of months now with zero leaks.

Benjamin ★★★★★

I’ve been using these HNBR o-rings in a high-temp application, and the 80 durometer feels perfect—not too stiff, not too soft. They hold up well at 300°F without any noticeable hardening after a few cycles. Definitely a solid upgrade from my old Buna-N ones.