8.4MM CS X 339.5MM ID BLACK BUNA 70D

Buna-N O-Ring, 8.4 x 339.5 mm, 70A, Black, -40 to 250°F

Status
Available
Est. Ship Date
2 Nov 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:
H8.4X339.5
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Product Specification

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The H8.4X339.5 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 339.5 mm (13.366 in), a cross section of 8.4 mm (0.331 in), and an outside diameter of 356.3 mm (14.03 in). This o-ring remains the most cost-effective sealing element available for pressurized assemblies. Additional detail on this item: Metric O-RING, JIS P340.

As a material, Buna-N (Nitrile) is valued for reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. This material stands up to water, greases and lubricants, and propane and butane. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service.

Common environments for this compound include fluid power, automotive, and general industrial maintenance.

Stocked as H8.4X339.5 and sold individually. Unit weight is approximately 73.838 g. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Item
H8.4X339.5
Description
8.4MM CS X 339.5MM ID BLACK BUNA 70D
Actual Outside Diameter
356.3 mm (14.03 inch)
Actual Cross Section
8.4 mm (0.331 inch)
Actual Inside Diameter
339.5 mm (13.366 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity