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1.78mm CS

Buna-N / Nitrile Metric O-Rings 70 Duro (NBR):

A general purpose, sulfur-cured Buna-N Nitrile O-Ring, the most commonly used elastomer for sealing products. Nitrile, also known as Buna-N or NBR, is a copolymer of Butadiene and Acrylonitirle. More than 50% of the Orings sold are Buna-N Nitrile Orings, commonly used in hydraulic/pneumatic motors, cylinders, pumps and valves.

O-Ring Dimensions are defined by the cross section (CS) and the inside diameter (ID).

Size not listed, special requirements or large quantities please click this link to Request a Price Quote.




Image Model+ Item Name Stock Price Quantity Discounts
1.78mm X 1.78mm Metric Buna-N 70 O-ring N1.78X001.78

1.78mm X 1.78mm Metric Buna-N 70 O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
53325
$0.03

Add:
Min:  17
Quantity Discounts
17-33,333$0.03
33,334-124,999$0.02
125,000+$0.02
1.78mm X 2.57mm Metric Buna-N 70 O-ring N1.78X002.57

1.78mm X 2.57mm Metric Buna-N 70 O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
402175
$0.03

Add:
Min:  17
Quantity Discounts
17-499$0.03
500-3,333$0.02
3,334+$0.02
1.78mm X 2.9mm Metric Buna-N 70 O-ring N1.78X002.9

1.78mm X 2.9mm Metric Buna-N 70 O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
471147
$0.03

Add:
Min:  17
Quantity Discounts
17-1,249$0.03
1,250-4,999$0.02
5,000+$0.02
1.78mm X 3.17mm Buna-N 70 Metric O-ring BS801 N1.78X003.17

1.78mm X 3.17mm Buna-N 70 Metric O-ring BS801

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
1136
$0.12

Add:
Min:  5
Quantity Discounts
5-277$0.12
278-1,666$0.09
1,667+$0.06
1.78mm X 3.2mm Metric Buna-N 70 O-ring N1.78X003.2

1.78mm X 3.2mm Metric Buna-N 70 O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
12467
$0.09

Add:
Min:  5
Quantity Discounts
5-277$0.09
278-1,666$0.07
1,667+$0.05
1.78mm X 3.68mm Metric Buna-N 70 O-ring N1.78X003.68

1.78mm X 3.68mm Metric Buna-N 70 O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
202914
$0.03

Add:
Min:  17
Quantity Discounts
17-1,249$0.03
1,250-4,999$0.02
5,000+$0.02
1.78mm X 4.47mm Metric Buna-N 70 O-ring N1.78X004.47

1.78mm X 4.47mm Metric Buna-N 70 O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
110230
$0.03

Add:
Min:  17
Quantity Discounts
17-1,249$0.03
1,250-4,999$0.02
5,000+$0.02
1.78mm X 4.76mm Buna-N 70 Metric O-ring BS802 N1.78X004.76

1.78mm X 4.76mm Buna-N 70 Metric O-ring BS802

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
2638
$0.09

Add:
Min:  5
Quantity Discounts
5-277$0.09
278-1,666$0.07
1,667+$0.05
1.78mm X 5.28mm Metric Buna-N 70 O-ring N1.78X005.28

1.78mm X 5.28mm Metric Buna-N 70 O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
232988
$0.03

Add:
Min:  17
Quantity Discounts
17-1,249$0.03
1,250-4,999$0.02
5,000+$0.02
1.78mm X 6.07mm Metric Buna-N 70 O-ring N1.78X006.07

1.78mm X 6.07mm Metric Buna-N 70 O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
139567
$0.03

Add:
Min:  17
Quantity Discounts
17-1,249$0.03
1,250-4,999$0.02
5,000+$0.02
1.78mm X 6.35mm Buna-N 70 Metric O-ring BS803 N1.78X006.35

1.78mm X 6.35mm Buna-N 70 Metric O-ring BS803

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
1614
$0.14

Add:
Min:  10
Quantity Discounts
10-227$0.14
228-1,428$0.11
1,429+$0.07
1.78mm X 6.75mm Buna-N 70 Metric O-ring BS610 N1.78X006.75

1.78mm X 6.75mm Buna-N 70 Metric O-ring BS610

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
752
$0.14

Add:
Min:  4
Quantity Discounts
4-227$0.14
228-1,428$0.11
1,429+$0.07
1.78mm X 7.65mm Metric Buna-N 70 O-ring N1.78X007.65

1.78mm X 7.65mm Metric Buna-N 70 O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
215214
$0.03

Add:
Min:  17
Quantity Discounts
17-1,249$0.03
1,250-4,999$0.02
5,000+$0.02
N1.78X007.94 Buna-N Nitrile 70 Metric O-ring N1.78X007.94

N1.78X007.94 Buna-N Nitrile 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
325
$0.20

Add:
Min:  3
Quantity Discounts
3-166$0.20
167-999$0.15
1,000+$0.10
N1.78X008.73 Buna-N Nitrile 70 Metric O-ring N1.78X008.73

N1.78X008.73 Buna-N Nitrile 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
5171
$0.16

Add:
Min:  4
Quantity Discounts
4-208$0.16
209-1,249$0.12
1,250+$0.08
1.78mm X 9.25mm Metric Buna-N 70 O-ring N1.78X009.25

1.78mm X 9.25mm Metric Buna-N 70 O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
196943
$0.03

Add:
Min:  17
Quantity Discounts
17-1,249$0.03
1,250-4,999$0.02
5,000+$0.02
N1.78X009.52 Buna-N Nitrile 70 Metric O-ring N1.78X009.52

N1.78X009.52 Buna-N Nitrile 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
5686
$0.17

Add:
Min:  3
Quantity Discounts
3-192$0.17
193-1,111$0.13
1,112+$0.09
1.78mm X 10.82mm Metric Buna-N 70 O-ring N1.78X010.82

1.78mm X 10.82mm Metric Buna-N 70 O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
223285
$0.03

Add:
Min:  17
Quantity Discounts
17-1,249$0.03
1,250-4,999$0.02
5,000+$0.02
1.78mm X 11.11mm Buna-N Nitrile 70 Metric O-ring N1.78X011.11

1.78mm X 11.11mm Buna-N Nitrile 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
188
$0.18

Add:
Min:  3
Quantity Discounts
3-178$0.18
179-1,111$0.14
1,112+$0.09
1.78mm X 11.91mm Buna-N Nitrile 70 Metric O-ring N1.78X011.91

1.78mm X 11.91mm Buna-N Nitrile 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
97
$0.39

Add:
Min:  2
Quantity Discounts
2-86$0.39
87-499$0.29
500+$0.20


What are the most common O-ring compounds?

We stock O-Rings in over 20 different compounds and durometers the following six are the standard rubber materials in a range of durometers (Shore A) hardness to satisfy practically any service condition:

Buna-N O-Rings / Nitrile O-Rings / NBR: Nitrile (Buna-N) is the most widely used elastomer due to its excellent resistance to petroleum products, operating temperature range (-40°F to +257°F) and one of the best performance-to-cost values. It's an ideal material for aerospace, automotive, propane and natural gas applications. Special Hydrogenated Nitrile (HNBR) compounds can improve resistance to direct ozone, sunlight, and weather exposure while increasing temperature range to +300°F.
AS-568 Buna-N O-Rings | Metric Buna-N O-Rings

Viton® O-Rings / FKM: Fluorocarbon (Viton®) exhibits exceptional resistance to chemicals, oils, temperature extremes (-13°F to +446°F), low compression set, low gas permeability and excellent aging characteristics. Applications include: aircraft engines, automotive fuel handling systems, and chemical processing industries. FKM is also suitable for high vacuum applications. It is not recommended for exposure to ketones, alkalis, and Skydrol® fluids. Custom compounds are available with improved chemical and low temperature resistance.
AS-568 Viton® O-Rings | Metric Viton® O-Rings

Ethylene-Propylene / EPDM O-Rings: EPDM has outstanding resistance to heat, water and steam, alkali, mild acidic and oxygenated solvents, ozone, and sunlight (-40ºF to +275ºF); but it is not recommended for gasoline, petroleum oil and grease, and hydrocarbon environments. This popular rubber compound is usually the first choice for low torque drive belt applications.
AS-568 EPDM O-Rings | Metric EPDM O-Rings

Silicone O-Rings / VMQ: In the Silicone family, you will find compounds which are superior as static seals in extreme temperature conditions. Standard compounds handle operating temperatures -85º to +400ºF. Silicone compounds are popular in food and medical applications because they are very clean and do not impart odor or taste. Special Phenyl silicones can be used down to -148°F.
AS-568 Silicone O-Rings | Metric Silicone O-Rings

Neoprene® O-Rings / CR: Neoprene (-40º to +250ºF) is reasonably priced and features good resistance to petroleum oils, ozone, sunlight and oxygen aging, relatively low compression set, good resilience and outstanding physical toughness. It is the preferred sealing material for the refrigeration industry because of its resistance to ammonia and Freon®.
AS-568 Neoprene® O-Rings