8.4MM CS X 239.1MM ID BLACK BUNA 70D

Buna-N O-Ring, 8.4 x 239.1 mm, 70A, Black, -40 to 250°F

Status
Available
Est. Ship Date
31 Oct 2026
Material
Buna-N (Nitrile / NBR)
Durometer
70 Shore A
Cross Section Type
Round
Color
Black
Minimum Temperature
-40°F (-40°C)
Maximum Temperature
250°F (121°C)
Unit of Measure
EA
SKU:
H8.4X239.1
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Product Specification

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The H8.4X239.1 is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 239.1 mm (9.413 in), a cross section of 8.4 mm (0.331 in), and an outside diameter of 255.9 mm (10.07 in). This o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

The compound resists greases and lubricants, propane and butane, and water. Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C).

It sees regular use in automotive, agricultural equipment, and general industrial maintenance.

H8.4X239.1 ships individually. Check the compound against your process media, pressure and temperature before committing to a design. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.
Item
H8.4X239.1
Description
8.4MM CS X 239.1MM ID BLACK BUNA 70D
Actual Outside Diameter
255.9 mm (10.07 inch)
Actual Cross Section
8.4 mm (0.331 inch)
Actual Inside Diameter
239.1 mm (9.413 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity