4MM CS X 120MM ID BLACK BUNA 70D

Buna-N O-Ring, 4 x 120 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:
H4X120
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Product Specification

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Ordered as H4X120, this is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 120 mm (4.724 in), a cross section of 4 mm (0.157 in), and an outside diameter of 128 mm (5.04 in). The 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 many alcohols. Buna-N (Nitrile) is specified for an economical choice for high-volume maintenance programs and low compression set under sustained load. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C).

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

H4X120 ships individually. Unit weight is approximately 6.015 g. Check the compound against your process media, pressure and temperature before committing to a design.
Item
H4X120
Description
4MM CS X 120MM ID BLACK BUNA 70D
Actual Outside Diameter
128 mm (5.04 inch)
Actual Cross Section
4 mm (0.157 inch)
Actual Inside Diameter
120 mm (4.724 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity