Description
Homogenous U-cups (block vees) are a non-loaded, single material U-cup. The HU 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. The HU seal is typically made from an 80 durometer Nitrile but also comes in Viton™/fluorocarbon, Neoprene and other homogenous materials.
As pressure is applied to the homogenous U-cup the seal experiences an increase in sealing force until it reaches the maximum pressure the seal can handle. Homogeneous U-cup seals can handle up to 500 PSI; however, if you have applications that require higher pressure capabilities please consult a Hi-Tech Seals’ sales representative.
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Profiles
|  | Homogenous U-Cup
The standard homogenous u-cup has a u-shaped groove formed in such a manner that there is an inside and outside sealing lip.
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Part Numbers
* Height is only listed if the axial height is greater than the cross-section.
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| Material: | Temp. Range |
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| Nitrile | -40°C | to | 120°C |
| Viton™/Fluorocarbon | -26°C | to | 204°C |
| Neoprene | -40°C | to | 121°C |
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Example: HU - 0437 0688 - Nitrile Homogenous U-Cup - 7/16” Nom. I.D., 11/16” Nom. O.D.
Go to Homogenous U-Cup size charts. |
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Groove Configuration
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 |
 |
A |
B |
C |
D |
Seal I.D. | Dim. |
Groove
Tol. |
Rod
Tol. | Throat Ø | Seal
O.D. | Dim | C. Bore
Tol. | Gland
Tol. | Piston Ø |
Dim | Tol. | Dim | Tol |
0.125 -
1.500 | Nom ID | + 0.000
- 0.001 | + 0.000
- 0.001 | ID + 0.001 | + 0.002
- 0.000 | 0.250 -
2.375 | Nom OD | + 0.003
- 0.000 | + 0.002
- 0.000 | OD - 0.002 | + 0.000
- 0.001 |
1.506 -
2.500 | " | + 0.000
- 0.002 | + 0.000
- 0.001 |
ID + 0.001 |
+ 0.002
- 0.000 |
2.437 -
4.750 |
" |
+ 0.004
- 0.000 |
+ 0.003
- 0.000 |
OD - 0.002 |
+ 0.000
- 0.002 |
2.506 -
8.000 |
" |
+ 0.000
- 0.003 |
+ 0.000
- 0.002 |
ID + 0.001 |
+ 0.003
- 0.000 |
5.000 -
7.750 |
" |
+ 0.004
- 0.000 |
+ 0.003
- 0.000 |
OD - 0.003 |
+ 0.000
- 0.003 |
8.250+ |
" |
+ 0.000
- 0.004 |
+ 0.000
- 0.003 |
ID + 0.002 |
+ 0.004
- 0.000 |
8.000+ |
" |
+ 0.005
- 0.000 |
+ 0.003
- 0.000 |
OD - 0.003 |
+ 0.000
- 0.004 |
Groove Width: The groove width is the seal height + 1/32nd ± 0.010 |
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