3MM CS X 72MM ID BLACK BUNA 70D

Buna-N O-Ring, 3 x 72 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:
H3X72
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Product Specification

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This o-ring is supplied in black Buna-N (Nitrile) 70 Shore A built to an inside diameter of 72 mm (2.835 in), a cross section of 3 mm (0.118 in), and an outside diameter of 78 mm (3.07 in), catalogued under part number H3X72. It delivers dependable bidirectional sealing in a compact groove envelope.

The compound resists hydraulic fluids, greases and lubricants, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load and an economical choice for high-volume maintenance programs. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where polar solvents or automotive brake fluid are present.

It sees regular use in hydraulic and pneumatic systems, construction equipment, and automotive.

This item is sold individually under part number H3X72. Unit weight is approximately 2.022 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
H3X72
Description
3MM CS X 72MM ID BLACK BUNA 70D
Actual Outside Diameter
78 mm (3.07 inch)
Actual Cross Section
3 mm (0.118 inch)
Actual Inside Diameter
72 mm (2.835 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity