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1/16" Cross Section

Symmetrical Seals - 8400 Series - HRU

HRU and 8400 Series u-cups are symmetrical lip seals for use in either rod or piston sealing applications. The thin, flexible lip design reacts to low pressure and provides an extremely smooth, steady movement with less break away force required because of the inherent low friction. The HRU - 8400 style utilizes a beveled lip, ideal for wiping fluid film. Style HRU - 8400 u-seals are precision molded from 80 Durometer Buna-N rubber or Viton - FKM. While the HRU - 8400 U-cups are primarily designed for pneumatic applications, they can also be used in low to medium pressure hydraulic applications. The pressure range of the u-cups may be extended by incorporating an back-up ring.

*Fluorocarbon - Viton products end with a "V" all others are Buna-N 80 Durometer.





Image Model+ Item Name Stock Price Quantity Discounts
HRU06-0.25-06 Buna-N 70 Pruva U-Cup HRU06-0.25-06

HRU06-0.25-06 Buna-N 70 Pruva U-Cup

U-cup Size: 1/4"ID X 3/8"OD X 1/16"CS Symmetrical Seals - 8400 Series - HRU - 666 Pruva HRU and 8400 Series u-cups are symmetrical lip...
74
$0.92

Add:

Quantity Discounts
1$0.92
2-11$0.83
12+$0.69
HRU06-0.31-06 Buna-N 70 Pruva U-Cup HRU06-0.31-06

HRU06-0.31-06 Buna-N 70 Pruva U-Cup

U-cup Size: 5/16"ID X 7/16"OD X 1/16"CS - Replacement for -011 O-Ring Symmetrical Seals - 8400 Series - HRU - 666 Pruva HRU and 8400...
35
$0.92

Add:

Quantity Discounts
1$0.92
2-11$0.83
12+$0.69
HRU06-0.36-06 Buna-N 70 Pruva U-Cup HRU06-0.36-06

HRU06-0.36-06 Buna-N 70 Pruva U-Cup

U-cup Size: 3/8"ID X 1/2"OD X 1/16"CS - Replacement for -012 O-Ring Symmetrical Seals - 8400 Series - HRU - 666 Pruva HRU and 8400...
182
$0.92

Add:

Quantity Discounts
1$0.92
2-11$0.83
12+$0.69


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