5MM CS X 128MM ID BLACK BUNA 70D

Ordered as H5X128, this is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 128 mm (5.039 in), a cross section of 5 mm (0.197 in), and an outside diameter of 138 mm (5.43 in). The o-ring delivers dependable bidirectional sealing in a compact groove envelope.

Buna-N (Nitrile) is specified for strong abrasion and tear resistance, reliable performance in both static and dynamic service. The compound resists petroleum-based oils, water, and greases and lubricants. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ketones or automotive brake fluid.

Maintenance and OEM teams specify it across hydraulic and pneumatic systems, construction equipment, and agricultural equipment.

H5X128 ships individually. Unit weight is approximately 10.019 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.