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-400 Series - 0.275 -1/4" CS

50 Durometer, Commercial Grade Soft Buna-N O-Rings

Designed for applications requiring soft O-Ring sealing material. Primarily used as a low pressure static seal or gasket. Buna-N compound materials are "standard” for most O-Ring service. While they are not as strong as other Buna-N O-Rings, Soft Buna-N O-Rings require less force to make an effective seal and conform better to uneven surfaces. They are suitable for a broad range of fluids including oils, water, and mild chemicals.




Image Model+ Item Name Qty. Price Quantity Discounts
AS568-425 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50425

AS568-425 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...
260
$6.64

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Quantity Discounts
1-7$6.64
8-37$3.32
38+$2.65
AS568-426 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50426

AS568-426 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
$6.70

Add:
Min Qty:  129
Quantity Discounts
129-179$6.70
180-373$3.35
374+$2.68
AS568-427 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50427

AS568-427 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
$7.04

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Min Qty:  56
Quantity Discounts
56-170$7.04
171-355$3.52
356+$2.81
AS568-428 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50428

AS568-428 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
$7.18

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Min Qty:  152
Quantity Discounts
152-167$7.18
168-348$3.59
349+$2.87
AS568-429 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50429

AS568-429 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
$7.26

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Min Qty:  58
Quantity Discounts
58-165$7.26
166-344$3.63
345+$2.90
AS568-430 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50430

AS568-430 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
$7.36

Add:
Min Qty:  63
Quantity Discounts
63-163$7.36
164-340$3.68
341+$2.94
AS568-431 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50431

AS568-431 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
$7.44

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Min Qty:  1,667
Quantity Discounts
1667-161$7.44
162-336$3.72
337+$2.97
AS568-432 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50432

AS568-432 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...
437
$7.50

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Quantity Discounts
1-6$7.50
7-33$3.75
34+$3.00
AS568-433 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50433

AS568-433 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...
366
$7.58

Add:

Quantity Discounts
1-6$7.58
7-33$3.79
34+$3.03
AS568-434 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50434

AS568-434 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...
0
$7.68

Add:
Min Qty:  116
Quantity Discounts
116-156$7.68
157-325$3.84
326+$3.07
AS568-435 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50435

AS568-435 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
$7.84

Add:
Min Qty:  63
Quantity Discounts
63-153$7.84
154-319$3.92
320+$3.13
AS568-436 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50436

AS568-436 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
$8.00

Add:
Min Qty:  142
Quantity Discounts
142-149$8.00
150-312$4.00
313+$3.20
AS568-437 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50437

AS568-437 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...
436
$8.16

Add:

Quantity Discounts
1-6$8.16
7-30$4.08
31+$3.26
AS568-438 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50438

AS568-438 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
$8.34

Add:
Min Qty:  144
Quantity Discounts
144$8.34
144-300$4.17
301+$3.33
AS568-439 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50439

AS568-439 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...
449
$8.40

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Quantity Discounts
1-5$8.40
6-29$4.20
30+$3.36
AS568-440 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50440

AS568-440 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
$11.48

Add:
Min Qty:  204
Quantity Discounts
204-104$11.48
105-217$5.74
218+$4.59
AS568-441 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50441

AS568-441 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
$11.56

Add:
Min Qty:  39
Quantity Discounts
39-103$11.56
104-216$5.78
217+$4.62
AS568-442 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50442

AS568-442 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...
283
$11.70

Add:

Quantity Discounts
1-4$11.70
5-21$5.85
22+$4.68
AS568-443 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50443

AS568-443 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...
648
$12.04

Add:
Min Qty:  49
Quantity Discounts
49-4$12.04
5-20$6.02
21+$4.81
AS568-444 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50444

AS568-444 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...
318
$12.36

Add:

Quantity Discounts
1-4$12.36
5-20$6.18
21+$4.94
AS568-445 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50445

AS568-445 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

8"ID X 8-1/2"OD X 1/4"CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
0
$12.38

Add:
Min Qty:  521
Quantity Discounts
521-96$12.38
97-202$6.19
203+$4.95
AS568-446 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50446

AS568-446 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

8-1/2"ID X 9"OD X 1/4"CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
0
$12.60

Add:
Min Qty:  167
Quantity Discounts
167-95$12.60
96-198$6.30
199+$5.04
AS568-447 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50447

AS568-447 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

9"ID X 9-1/2"OD X 1/4"CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
0
$13.00

Add:
Min Qty:  556
Quantity Discounts
556-92$13.00
93-192$6.50
193+$5.20
AS568-448 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50448

AS568-448 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

9-1/2"ID X 10"OD X 1/4"CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
0
$13.66

Add:
Min Qty:  334
Quantity Discounts
334-87$13.66
88-183$6.83
184+$5.46
AS568-449 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring B50449

AS568-449 B50 (NBR) Buna-N Nitrile 50 Duro O-Ring

10"ID X 10-1/2"OD X 1/4"CS Buna-N O-Rings 50 Duro (NBR): The most commonly used elastomer for sealing products. Nitrile, also known as...
0
$14.08

Add:
Min Qty:  171
Quantity Discounts
171-85$14.08
86-177$7.04
178+$5.63