1.78MM CS X 14MM ID BLACK BUNA 70D

Buna-N O-Ring, 1.78 x 14 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:
H1.78X14
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Product Specification

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The H1.78X14 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 14 mm (0.551 in), a cross section of 1.78 mm (0.07 in), and an outside diameter of 17.56 mm (0.69 in). This o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

As a material, Buna-N (Nitrile) is valued for the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. The material holds up against hydraulic fluids, greases and lubricants, and water. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with strong acids or ozone and direct sunlight.

Typical settings include agricultural equipment, automotive, and construction equipment.

Stocked as H1.78X14 and sold individually. Check the compound against your process media, pressure and temperature before committing to a design. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.
Item
H1.78X14
Description
1.78MM CS X 14MM ID BLACK BUNA 70D
Actual Outside Diameter
17.56 mm (0.69 inch)
Actual Cross Section
1.78 mm (0.07 inch)
Actual Inside Diameter
14 mm (0.551 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity