5/16" 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) HRU31-2.87-31 Homogeneous U-Seals HRU31-2.87-31

HRU31-2.87-31 Homogeneous U-Seals

2-7/8" ID X 3-1/2" OD X 5/16" 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...
 In Stock: 0
$10.900
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Quantity Discounts
1-9$10.900
10-99$8.720
100+$7.630
(image for) HRU31-4.37-31 Homogeneous U-Seals HRU31-4.37-31

HRU31-4.37-31 Homogeneous U-Seals

4-3/8" ID X 5" OD X 5/16" 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....
 In Stock: 0
$9.980
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Quantity Discounts
1-9$9.980
10-99$7.990
100+$6.990
(image for) HRU31-5.37-31 Homogeneous U-Seals HRU31-5.37-31

HRU31-5.37-31 Homogeneous U-Seals

5-3/8" ID X 6" OD X 5/16" 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....
 In Stock: 0
$14.950
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Quantity Discounts
1-9$14.950
10-99$11.960
100+$10.470
(image for) HRU31-5.37-31V Homogeneous U-Seals HRU31-5.37-31V

HRU31-5.37-31V Homogeneous U-Seals

5-3/8" ID X 6" OD X 5/16" 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...
 In Stock: 0
$64.720
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Quantity Discounts
1-9$64.720
10-99$51.780
100+$45.310
(image for) HRU31-5.50-31 Homogeneous U-Seals HRU31-5.50-31

HRU31-5.50-31 Homogeneous U-Seals

5-1/2" ID X 5-1/8" OD X 5/16" 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...
 In Stock: 0
$19.630
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Quantity Discounts
1-9$19.630
10-99$15.710
100+$13.750
(image for) HRU31-5.50-31V Homogeneous U-Seals HRU31-5.50-31V

HRU31-5.50-31V Homogeneous U-Seals

5-1/2" ID X 6-1/8" OD X 5/16" 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...
 In Stock: 0
$85.030
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Quantity Discounts
1-9$85.030
10-99$68.030
100+$59.530
(image for) HRU31-6.37-31 Homogeneous U-Seals HRU31-6.37-31

HRU31-6.37-31 Homogeneous U-Seals

6-3/8" ID X 7" OD X 5/16" 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....
 In Stock: 0
$23.640
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Quantity Discounts
1-9$23.640
10-99$18.920
100+$16.550
(image for) HRU31-6.37-31V Homogeneous U-Seals HRU31-6.37-31V

HRU31-6.37-31V Homogeneous U-Seals

6-3/8" ID X 7" OD X 5/16" 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...
 In Stock: 0
$89.680
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Quantity Discounts
1-9$89.680
10-99$71.750
100+$62.780
(image for) HRU31-7.37-31 Homogeneous U-Seals HRU31-7.37-31

HRU31-7.37-31 Homogeneous U-Seals

7-3/8" ID X 8" OD X 5/16" 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....
 In Stock: 0
$29.270
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Quantity Discounts
1-9$29.270
10-99$23.420
100+$20.490
(image for) HRU31-7.37-31V Homogeneous U-Seals HRU31-7.37-31V

HRU31-7.37-31V Homogeneous U-Seals

7-3/8" ID X 8" OD X 5/16" 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...
 In Stock: 0
$137.480
Add:
Quantity Discounts
1-9$137.480
10-99$109.990
100+$96.240
Displaying 1 to 10 (of 10 Products)