8.4MM CS X 164.5MM ID BLACK BUNA 90D

APG stocks the H90M8.4X164.5, a black Buna-N (Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 164.5 mm (6.476 in), a cross section of 8.4 mm (0.331 in), and an outside diameter of 181.3 mm (7.14 in). An o-ring delivers dependable bidirectional sealing in a compact groove envelope. The catalog record notes: Metric O-RING, JIS P165.

This material stands up to hydraulic fluids, petroleum-based oils, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service.

You will find this material specified across hydraulic and pneumatic systems, automotive, and construction equipment.

Stocked as H90M8.4X164.5 and sold individually. Unit weight is approximately 41.526 g. Check the compound against your process media, pressure and temperature before committing to a design. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.