3MM CS X 104.5MM ID BLACK BUNA 70D

Buna-N O-Ring, 3 x 104.5 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:
H3X104.5
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Product Specification

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The H3X104.5 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 104.5 mm (4.114 in), a cross section of 3 mm (0.118 in), and an outside diameter of 110.5 mm (4.35 in). This o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

Expect good resistance to many alcohols, greases and lubricants, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or automotive brake fluid call for a different compound.

It sees regular use in fluid power, hydraulic and pneumatic systems, and general industrial maintenance.

Order part number H3X104.5, sold individually. Unit weight is approximately 2.987 g. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.
Item
H3X104.5
Description
3MM CS X 104.5MM ID BLACK BUNA 70D
Actual Outside Diameter
110.5 mm (4.35 inch)
Actual Cross Section
3 mm (0.118 inch)
Actual Inside Diameter
104.5 mm (4.114 inch)
FDA Compliant
No
Measurement System
Metric
Metal Detectable
No
NSF Certified
No
Product Code
6015
Product Category
O-Rings - Metric - Commodity