3.5MM CS X 71MM ID BLACK BUNA 70D

Buna-N O-Ring, 3.5 x 71 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:
H3.5X71
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Product Specification

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The H3.5X71 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 71 mm (2.795 in), a cross section of 3.5 mm (0.138 in), and an outside diameter of 78 mm (3.07 in). This o-ring remains the most cost-effective sealing element available for pressurized assemblies.

Buna-N (Nitrile) is specified here for reliable performance in both static and dynamic service, strong abrasion and tear resistance. The material holds up against water, greases and lubricants, and petroleum-based oils. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to automotive brake fluid or ozone and direct sunlight will shorten service life.

You will find this material specified across hydraulic and pneumatic systems, automotive, and agricultural equipment.

Order part number H3.5X71, sold individually. Unit weight is approximately 2.75 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Item
H3.5X71
Description
3.5MM CS X 71MM ID BLACK BUNA 70D
Actual Outside Diameter
78 mm (3.07 inch)
Actual Cross Section
3.5 mm (0.138 inch)
Actual Inside Diameter
71 mm (2.795 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity