4MM CS X 8MM ID BLACK BUNA 70D

Buna-N O-Ring, 4 x 8 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:
H4X8
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Product Specification

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Part number H4X8 is a black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 8 mm (0.315 in), a cross section of 4 mm (0.157 in), and an outside diameter of 16 mm (0.63 in). An o-ring remains the most cost-effective sealing element available for pressurized assemblies.

As a material, Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. This material stands up to hydraulic fluids, water, and propane and butane. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ozone and direct sunlight or ketones are present.

Typical settings include agricultural equipment, general industrial maintenance, and construction equipment.

Order part number H4X8, sold individually. Unit weight is approximately 0.5698 g. Review your operating media and conditions against this specification before installation.
Item
H4X8
Description
4MM CS X 8MM ID BLACK BUNA 70D
Actual Outside Diameter
16 mm (0.63 inch)
Actual Cross Section
4 mm (0.157 inch)
Actual Inside Diameter
8 mm (0.315 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity