5.3MM CS X 300MM ID BLACK BUNA 70D

Buna-N O-Ring, 5.3 x 300 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:
H5.3X300
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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 300 mm (11.811 in), a cross section of 5.3 mm (0.209 in), and an outside diameter of 310.6 mm (12.23 in), catalogued under part number H5.3X300. It delivers dependable bidirectional sealing in a compact groove envelope.

Buna-N (Nitrile) is specified here for reliable performance in both static and dynamic service, most widely specified general-purpose sealing elastomer. This material stands up to hydraulic fluids, many alcohols, and petroleum-based oils. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C).

Common environments for this compound include construction equipment, automotive, and hydraulic and pneumatic systems.

This item is sold individually under part number H5.3X300. Unit weight is approximately 25.85 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.
Item
H5.3X300
Description
5.3MM CS X 300MM ID BLACK BUNA 70D
Actual Outside Diameter
310.6 mm (12.23 inch)
Actual Cross Section
5.3 mm (0.209 inch)
Actual Inside Diameter
300 mm (11.811 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity