5MM CS X 310MM ID BLACK BUNA 70D

Buna-N O-Ring, 5 x 310 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:
H5X310
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Product Specification

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Part number H5X310 is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 310 mm (12.205 in), a cross section of 5 mm (0.197 in), and an outside diameter of 320 mm (12.6 in). An 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 most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. Expect good resistance to propane and butane, greases and lubricants, and petroleum-based oils. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with polar solvents or strong acids.

It sees regular use in fluid power, general industrial maintenance, and automotive.

This item is sold individually under part number H5X310. Unit weight is approximately 23.401 g. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Item
H5X310
Description
5MM CS X 310MM ID BLACK BUNA 70D
Actual Outside Diameter
320 mm (12.6 inch)
Actual Cross Section
5 mm (0.197 inch)
Actual Inside Diameter
310 mm (12.205 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity