-342 BLACK BUNA 70D X-RING

This quad-ring is supplied in AS568-342 black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 3.6 in (91.44 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.02 in (102.11 mm), catalogued under part number QH70342. It uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

Expect good resistance to petroleum-based oils, propane and butane, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is known for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in automotive brake fluid or ketones. The profile itself contributes lower compressive load required to achieve a seal and a parting line located away from the sealing surface.

Maintenance and OEM teams specify it across fluid power, hydraulic and pneumatic systems, and automotive.

Order part number QH70342, sold individually. Unit weight is approximately 8.756 g. As always, verify media compatibility and operating conditions against the requirements of your specific application.