3MM CS X 126MM ID BLACK BUNA 70D

Buna-N O-Ring, 3 x 126 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:
H3X126
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Product Specification

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H3X126 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 126 mm (4.961 in), a cross section of 3 mm (0.118 in), and an outside diameter of 132 mm (5.2 in). In service, this o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

Buna-N (Nitrile) is specified here for low compression set under sustained load, reliable performance in both static and dynamic service. It resists water, propane and butane, and greases and lubricants. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with ketones or ozone and direct sunlight.

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

Reference part number H3X126 when ordering; the item is sold individually. Unit weight is approximately 3.57 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. For a size or compound outside the standard catalog, APG can quote from a print or sample.
Item
H3X126
Description
3MM CS X 126MM ID BLACK BUNA 70D
Actual Outside Diameter
132 mm (5.2 inch)
Actual Cross Section
3 mm (0.118 inch)
Actual Inside Diameter
126 mm (4.961 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity