APG stocks the H8.4X234.5, a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 234.5 mm (9.232 in), a cross section of 8.4 mm (0.331 in), and an outside diameter of 251.3 mm (9.89 in). An o-ring compresses into its gland to block fluid or gas migration across a joint. The catalog record notes: Metric O-RING, JIS P235.
The compound resists greases and lubricants, hydraulic fluids, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C).
Typical settings include fluid power, agricultural equipment, and construction equipment.
Order part number H8.4X234.5, sold individually. Unit weight is approximately 52.234 g. Check the compound against your process media, pressure and temperature before committing to a design. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Description 8.4MM CS X 234.5MM ID BLACK BUNA 70D
Actual Outside Diameter 251.3 mm (9.89 inch)
Actual Cross Section 8.4 mm (0.331 inch)
Actual Inside Diameter 234.5 mm (9.232 inch)
Measurement System Metric
Product Category O-Rings - Metric - Commodity