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-400 Series 1/4" CS




Image Model+ Item Name Stock Price Quantity Discounts
574-425 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-425

574-425 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-425 (0.236" W X 4.551"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
223
$1.49

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Quantity Discounts
1-22$1.49
23-133$1.12
134+$0.75
574-426 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-426

574-426 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-426 (0.236" W X 4.676"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
0
$1.60

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Quantity Discounts
1-20$1.60
21-124$1.20
125+$0.80
574-427 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-427

574-427 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-427 (0.236" W X 4.801"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
19
$1.70

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Quantity Discounts
1-19$1.70
20-117$1.28
118+$0.85
574-428 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-428

574-428 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-428 (0.236" W X 4.926"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
8
$1.81

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Quantity Discounts
1-18$1.81
19-109$1.36
110+$0.91
574-429 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-429

574-429 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-429 (0.236" W X 5.051"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
30
$1.86

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Quantity Discounts
1-17$1.86
18-107$1.40
108+$0.93
574-430 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-430

574-430 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-430 (0.236" W X 5.176"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
0
$1.92

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Quantity Discounts
1-17$1.92
18-104$1.44
105+$0.96
574-431 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-431

574-431 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-431 (0.236" W X 5.301"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
10
$2.00

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Quantity Discounts
1-16$2.00
17-99$1.50
100+$1.00
574-432 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-432

574-432 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-432 (0.236" W X 5.426"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
19
$2.08

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Quantity Discounts
1-16$2.08
17-96$1.56
97+$1.04
574-433 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-433

574-433 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-433 (0.236" W X 5.551"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
60
$2.22

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Quantity Discounts
1-14$2.22
15-90$1.67
91+$1.11
574-434 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-434

574-434 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-434 (0.236" W X 5.676"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
0
$2.29

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Quantity Discounts
1-14$2.29
15-86$1.72
87+$1.15
574-435 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-435

574-435 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-435 (0.236" W X 5.801"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
24
$2.34

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Quantity Discounts
1-14$2.34
15-85$1.76
86+$1.17
574-436 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-436

574-436 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-436 (0.236" W X 5.926"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
48
$2.45

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Quantity Discounts
1-13$2.45
14-81$1.84
82+$1.23
574-437 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-437

574-437 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-437 (0.236" W X 6.051"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
25
$2.55

Add:

Quantity Discounts
1-13$2.55
14-78$1.91
79+$1.28
574-438 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-438

574-438 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-438 (0.236" W X 6.274"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
6
$2.66

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Quantity Discounts
1-12$2.66
13-75$2.00
76+$1.33
574-439 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-439

574-439 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-439 (0.236" W X 6.524"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
8
$2.77

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Quantity Discounts
1-12$2.77
13-71$2.08
72+$1.39
574-440 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-440

574-440 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-440 (0.236" W X 6.774"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
7
$2.87

Add:

Quantity Discounts
1-11$2.87
12-69$2.15
70+$1.44
574-441 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-441

574-441 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-441 (0.236" W X 7.024"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
22
$2.98

Add:

Quantity Discounts
1-11$2.98
12-67$2.24
68+$1.49
574-442 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-442

574-442 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-442 (0.236" W X 7.274"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
0
$3.08

Add:

Quantity Discounts
1-10$3.08
11-64$2.31
65+$1.54
574-443 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-443

574-443 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-443 (0.236" W X 7.524"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
4
$3.19

Add:

Quantity Discounts
1-10$3.19
11-62$2.39
63+$1.60
574-444 90A Duro Buna-N Rubber Dished Back-up Rings N8-90-444

574-444 90A Duro Buna-N Rubber Dished Back-up Rings

AS568-444 (0.236" W X 7.774"ID X 0.117"HT) A backup ring, or anti extrision device, is used in both static and dynamic O-Ring sealing...
0
$3.30

Add:

Quantity Discounts
1-10$3.30
11-60$2.48
61+$1.65


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