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-400 Series - 0.275 -1/4" CS

50 Durometer, Commercial Grade Soft Buna-N

Designed for applications requiring soft O-ring sealing material. Primarily used as a low pressure static seal or gasket. B50 O-rings not in stock may take up to 7 weeks to ship. 6" ID & larger Vulcanized O-Rings available to reduce delivery times and minimum orders. Link to order B50 Vulcanized O-Rings.

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
-425 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50425

-425 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

4-1/2" ID X 5" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
54
$1.67

Add:

Quantity Discounts
1-279$1.67
280-1,796$1.25
1,797+$0.84
-426 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50426

-426 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

4-5/8" ID X 5-1/8" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
0
$1.69

Add:
Min:  119
Quantity Discounts
119-276$1.69
277-1,775$1.27
1,776+$0.85
-427 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50427

-427 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

4-3/4" ID X 5-1/4" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
0
$1.80

Add:
Min:  112
Quantity Discounts
112-259$1.80
260-1,666$1.35
1,667+$0.90
-428 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50428

-428 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

4-7/8" ID X 5-3/8" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
0
$1.84

Add:
Min:  109
Quantity Discounts
109-253$1.84
254-1,630$1.38
1,631+$0.92
-429 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50429

-429 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

5" ID X 5-1/2" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
0
$1.86

Add:
Min:  108
Quantity Discounts
108-250$1.86
251-1,612$1.40
1,613+$0.93
-430 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50430

-430 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

5-1/8" ID X 5-5/8" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
0
$1.89

Add:
Min:  106
Quantity Discounts
106-246$1.89
247-1,587$1.42
1,588+$0.95
-431 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50431

-431 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

5-1/4" ID X 5-3/4" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
0
$1.91

Add:
Min:  105
Quantity Discounts
105-244$1.91
245-1,570$1.43
1,571+$0.96
-432 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50432

-432 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

5-3/8" ID X 5-7/8" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
84
$1.94

Add:

Quantity Discounts
1-240$1.94
241-1,546$1.46
1,547+$0.97
-433 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50433

-433 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

5-1/2" ID X 6" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
437
$1.96

Add:

Quantity Discounts
1-17$1.96
18-102$1.47
103+$0.98
-434 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50434

-434 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

5-5/8" ID X 6-1/8" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
12
$1.99

Add:

Quantity Discounts
1-234$1.99
235-1,507$1.49
1,508+$1.00
-435 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50435

-435 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

5-3/4" ID X 6-1/4" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
0
$2.04

Add:
Min:  99
Quantity Discounts
99-228$2.04
229-1,470$1.53
1,471+$1.02
-436 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50436

-436 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

5-7/8" ID X 6-3/8" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
0
$2.09

Add:
Min:  96
Quantity Discounts
96-223$2.09
224-1,435$1.57
1,436+$1.05
-437 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50437

-437 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

6" ID X 6-1/2" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
484
$2.13

Add:

Quantity Discounts
1-219$2.13
220-1,408$1.60
1,409+$1.07
-438 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50438

-438 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

6-1/4"ID X 6-3/4"OD X 1/4"CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
0
$2.18

Add:
Min:  92
Quantity Discounts
92-214$2.18
215-1,376$1.64
1,377+$1.09
-439 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50439

-439 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

6-1/2" ID X 7" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
498
$2.21

Add:

Quantity Discounts
1-211$2.21
212-1,357$1.66
1,358+$1.11
-440 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50440

-440 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

6-3/4" ID X 7-1/4" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
0
$2.87

Add:
Min:  70
Quantity Discounts
70-162$2.87
163-1,045$2.15
1,046+$1.44
-441 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50441

-441 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

7" ID X 7-1/2" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
0
$2.89

Add:
Min:  70
Quantity Discounts
70-161$2.89
162-1,038$2.17
1,039+$1.45
-442 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50442

-442 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

7-1/4" ID X 7-3/4" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
0
$2.94

Add:
Min:  69
Quantity Discounts
69-158$2.94
159-1,020$2.21
1,021+$1.47
-443 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50443

-443 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

7-1/2" ID X 8" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known...
0
$3.04

Add:
Min:  66
Quantity Discounts
66-153$3.04
154-986$2.28
987+$1.52
-444 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50444

-444 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

7-3/4" ID X 8-1/4" OD X 1/4" CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also...
345
$3.14

Add:

Quantity Discounts
1-148$3.14
149-955$2.36
956+$1.57


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