7/32" Cross Section

Nitrile U-Cup Seals, also known as HRU Homogeneous U-Cups or block vee seals, are designed for reliable performance in low-pressure pneumatic and hydraulic systems. These compact, single-material seals offer a dependable upgrade or direct replacement for AS568 O-Rings, especially in rod and piston applications where space is limited and sealing performance is critical. Made from 70 durometer Nitrile (Buna-N), they resist oils, fuels, and hydraulic fluids while delivering consistent sealing under pressures up to 500 PSI. Ideal for industrial cylinders, automation systems, and maintenance operations, HRU U-Cups provide cost-effective, long-lasting performance trusted by OEMs and field techs alike.

Operating temperature: -40° to +212°F (-40° to +100°C)

Displaying 1 to 10 (of 10 Products)
Product Image Model Product Name Qty. Price Quantity Discounts
(image for) HRU21-2.50-21 Homogeneous U-Seals 70 Duro Black Buna N HRU21-2.50-21

HRU21-2.50-21 Homogeneous U-Seals 70 Duro Black Buna N

U-Cup, 7/32" C/S x 2-1/2" ID x 2-15/16" OD Homogenous U-cups (block vees) are a non-loaded, single material U-cup. The HRU seal is popular in low pressure applications where a low friction seal would be beneficial. The seal is most commonly used in pneumatic applications as a rod or piston seal. The design is suited for situations where space is limited or as an O-Ring replacement. The HRU seal is typically made from an 70...
 In Stock: 98
$5.240
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Quantity Discounts
1-9$5.240
10-99$4.200
100+$3.670
(image for) HRU21-2.50-21V Homogeneous U-Seals HRU21-2.50-21V

HRU21-2.50-21V Homogeneous U-Seals

2-1/2" ID X 2-15/16" OD X 7/32 HT Fluorocarbon FKM Homogenous U-cups (block vees) are a non-loaded, single material U-cup. The HRU seal is popular in low pressure applications where a low friction seal would be beneficial. The seal is most commonly used in pneumatic applications as a rod or piston seal. The design is suited for situations where space is limited or as an O-Ring replacement. The HRU seal is typically made from an 80...
 In Stock: 0
$27.840
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Quantity Discounts
1-9$27.840
10-99$22.280
100+$19.490
(image for) HRU21-2.56-21 Buna-N 80 U-Cup 2-9/16" ID X 3" OD X 7/32" HT HRU21-2.56-21

HRU21-2.56-21 Buna-N 80 U-Cup 2-9/16" ID X 3" OD X 7/32" HT

Low Friction Sealing for Pneumatic and Light Duty Applications If you need a simple, reliable seal for low pressure systems, this homogeneous U-Cup is a strong choice. Designed as a non-loaded, single material seal, it delivers smooth operation with very low friction, making it ideal for pneumatic and light-duty hydraulic use. Built from 80 durometer Buna-N (NBR), this seal provides dependable oil resistance and long service life. It is...
 In Stock: 0
$1.540
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Min Qty:  25
Quantity Discounts
25-49$1.540
50-1,249$1.280
1,250-3,499$0.900
3,500+$0.720
(image for) HRU21-2.75-21 Homogeneous U-Seals HRU21-2.75-21

HRU21-2.75-21 Homogeneous U-Seals

2-3/4" ID X 3-3/16" OD X 7/32" HT Homogenous U-cups (block vees) are a non-loaded, single material U-cup. The HRU seal is popular in low pressure applications where a low friction seal would be beneficial. The seal is most commonly used in pneumatic applications as a rod or piston seal. The design is suited for situations where space is limited or as an O-Ring replacement. The HRU seal is typically made from an 80 durometer...
 In Stock: 0
$6.080
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Quantity Discounts
1-9$6.080
10-99$4.870
100+$4.260
(image for) HRU21-2.81-21 Homogeneous U-Seals HRU21-2.81-21

HRU21-2.81-21 Homogeneous U-Seals

2-13/16" ID X 3-1/4" OD X 7/32" HT Homogenous U-cups (block vees) are a non-loaded, single material U-cup. The HRU seal is popular in low pressure applications where a low friction seal would be beneficial. The seal is most commonly used in pneumatic applications as a rod or piston seal. The design is suited for situations where space is limited or as an O-Ring replacement. The HRU seal is typically made from an 80 durometer...
 In Stock: 0
$6.380
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Quantity Discounts
1-9$6.380
10-99$5.110
100+$4.470
(image for) HRU21-2.81-21V Homogeneous U-Seals HRU21-2.81-21V

HRU21-2.81-21V Homogeneous U-Seals

2-13/16" ID X 2-1/4" OD X 7/32" HT Fluorocarbon FKM Homogenous U-cups (block vees) are a non-loaded, single material U-cup. The HRU seal is popular in low pressure applications where a low friction seal would be beneficial. The seal is most commonly used in pneumatic applications as a rod or piston seal. The design is suited for situations where space is limited or as an O-Ring replacement. The HRU seal is typically made from an...
 In Stock: 0
$28.960
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Quantity Discounts
1-9$28.960
10-99$23.170
100+$20.280
(image for) HRU21-3.00-21 Homogeneous U-Seals HRU21-3.00-21

HRU21-3.00-21 Homogeneous U-Seals

3" ID X 3-7/16" OD X 7/32" HT Homogenous U-cups (block vees) are a non-loaded, single material U-cup. The HRU seal is popular in low pressure applications where a low friction seal would be beneficial. The seal is most commonly used in pneumatic applications as a rod or piston seal. The design is suited for situations where space is limited or as an O-Ring replacement. The HRU seal is typically made from an 80 durometer Nitrile...
 In Stock: 0
$7.790
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Quantity Discounts
1-9$7.790
10-99$6.240
100+$5.460
(image for) HRU21-3.00-21V Homogeneous U-Seals HRU21-3.00-21V

HRU21-3.00-21V Homogeneous U-Seals

3" ID X 3-7/16" OD X 7/32" HT Fluorocarbon FKM Homogenous U-cups (block vees) are a non-loaded, single material U-cup. The HRU seal is popular in low pressure applications where a low friction seal would be beneficial. The seal is most commonly used in pneumatic applications as a rod or piston seal. The design is suited for situations where space is limited or as an O-Ring replacement. The HRU seal is typically made from an 80...
 In Stock: 0
$31.160
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Quantity Discounts
1-9$31.160
10-99$24.930
100+$21.820
(image for) HRU21-3.06-21 Homogeneous U-Seals HRU21-3.06-21

HRU21-3.06-21 Homogeneous U-Seals

3-1/16" ID X 3-1/2" OD X 7/32" HT Homogenous U-cups (block vees) are a non-loaded, single material U-cup. The HRU seal is popular in low pressure applications where a low friction seal would be beneficial. The seal is most commonly used in pneumatic applications as a rod or piston seal. The design is suited for situations where space is limited or as an O-Ring replacement. The HRU seal is typically made from an 80 durometer...
 In Stock: 0
$8.920
Add:
Quantity Discounts
1-9$8.920
10-99$7.140
100+$6.250
(image for) HRU21-3.31-21 Homogeneous U-Seals HRU21-3.31-21

HRU21-3.31-21 Homogeneous U-Seals

3-5/16" ID X 3-3/4" OD X 7/32" HT Homogenous U-cups (block vees) are a non-loaded, single material U-cup. The HRU seal is popular in low pressure applications where a low friction seal would be beneficial. The seal is most commonly used in pneumatic applications as a rod or piston seal. The design is suited for situations where space is limited or as an O-Ring replacement. The HRU seal is typically made from an 80 durometer...
 In Stock: 0
$9.830
Add:
Quantity Discounts
1-9$9.830
10-99$7.870
100+$6.890
Displaying 1 to 10 (of 10 Products)