3MM CS X 259.3MM ID BLACK BUNA 70D

Buna-N O-Ring, 3 x 259.3 mm, 70A, Black, -40 to 250°F

Status
Out of Stock
Est. Ship Date
29 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:
H3X259.3

Product Specification

-
Part number H3X259.3 is a black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 259.3 mm (10.209 in), a cross section of 3 mm (0.118 in), and an outside diameter of 265.3 mm (10.44 in). An o-ring delivers dependable bidirectional sealing in a compact groove envelope.

As a material, Buna-N (Nitrile) is known for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. The compound resists many alcohols, water, and greases and lubricants. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving ketones or ozone and direct sunlight call for a different compound.

Typical settings include construction equipment, hydraulic and pneumatic systems, and general industrial maintenance.

This item is sold individually under part number H3X259.3. Check the compound against your process media, pressure and temperature before committing to a design. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Item
H3X259.3
Description
3MM CS X 259.3MM ID BLACK BUNA 70D
Actual Outside Diameter
265.3 mm (10.44 inch)
Actual Cross Section
3 mm (0.118 inch)
Actual Inside Diameter
259.3 mm (10.209 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity