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-200 Series - 1/8" CS - 0.139" CS

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.

Operating temperature: -40° to +250°F




Image Model+ Item Name Stock Price Quantity Discounts
-201 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70201

-201 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

3/16"ID X 7/16"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
6291
$0.04

Add:
Min:  13
Quantity Discounts
13-1,166$0.04
1,167-7,499$0.03
7,500+$0.02
-202 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70202

-202 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

1/4"ID X 1/2"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
20200
$0.04

Add:
Min:  13
Quantity Discounts
13-1,166$0.04
1,167-7,499$0.03
7,500+$0.02
-203 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70203

-203 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

5/16"ID X 9/16"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
6673
$0.04

Add:
Min:  13
Quantity Discounts
13-1,166$0.04
1,167-7,499$0.03
7,500+$0.02
-204 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70204

-204 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

3/8"ID X 5/8"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
10149
$0.04

Add:
Min:  13
Quantity Discounts
13-1,166$0.04
1,167-7,499$0.03
7,500+$0.02
-205 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70205

-205 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

7/16"ID X 11/16"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
9092
$0.04

Add:
Min:  13
Quantity Discounts
13-1,166$0.04
1,167-7,499$0.03
7,500+$0.02
-206 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70206

-206 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

1/2"ID X 3/4"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
2761
$0.04

Add:
Min:  13
Quantity Discounts
13-1,166$0.04
1,167-7,499$0.03
7,500+$0.02
-207 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70207

-207 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

9/16"ID X 13/16"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
1539
$0.04

Add:
Min:  13
Quantity Discounts
13-1,166$0.04
1,167-7,499$0.03
7,500+$0.02
-208 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70208

-208 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

5/8"ID X 7/8"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
1775
$0.04

Add:
Min:  13
Quantity Discounts
13-1,166$0.04
1,167-7,499$0.03
7,500+$0.02
-209 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70209

-209 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

11/16"ID X 15/16"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
4391
$0.05

Add:
Min:  10
Quantity Discounts
10-933$0.05
934-5,999$0.04
6,000+$0.03
-210 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70210

-210 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

3/4"ID X 1"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
6603
$0.05

Add:
Min:  10
Quantity Discounts
10-933$0.05
934-5,999$0.04
6,000+$0.03
-211 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70211

-211 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

13/16"ID X 1 1/16"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
8142
$0.05

Add:
Min:  10
Quantity Discounts
10-933$0.05
934-5,999$0.04
6,000+$0.03
-212 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70212

-212 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

7/8"ID X 1 1/8"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
16305
$0.05

Add:
Min:  10
Quantity Discounts
10-933$0.05
934-5,999$0.04
6,000+$0.03
-213 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70213

-213 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

15/16"ID X 1 3/16"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
7969
$0.05

Add:
Min:  10
Quantity Discounts
10-933$0.05
934-5,999$0.04
6,000+$0.03
-214 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70214

-214 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

1"ID X 1 1/4"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
3911
$0.05

Add:
Min:  10
Quantity Discounts
10-933$0.05
934-5,999$0.04
6,000+$0.03
-215 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70215

-215 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

1 1/16"ID X 1 5/16"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
6566
$0.06

Add:
Min:  9
Quantity Discounts
9-777$0.06
778-4,999$0.05
5,000+$0.03
-216 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70216

-216 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

1 1/8"ID X 1 3/8"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
1196
$0.06

Add:
Min:  9
Quantity Discounts
9-777$0.06
778-4,999$0.05
5,000+$0.03
-217 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70217

-217 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

1 3/16"ID X 1 7/16"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
3545
$0.06

Add:
Min:  9
Quantity Discounts
9-777$0.06
778-4,999$0.05
5,000+$0.03
-218 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70218

-218 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

1 1/4"ID X 1 1/2"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
9029
$0.06

Add:
Min:  9
Quantity Discounts
9-777$0.06
778-4,999$0.05
5,000+$0.03
-219 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70219

-219 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

1 5/16"ID X 1 9/16"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
3716
$0.06

Add:
Min:  9
Quantity Discounts
9-777$0.06
778-4,999$0.05
5,000+$0.03
-220 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring B70220

-220 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring

1 3/8"ID X 1 5/8"OD X 1/8"CS Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
4222
$0.07

Add:
Min:  9
Quantity Discounts
9-666$0.07
667-4,285$0.05
4,286+$0.04


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