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Polyurethane U-Seal, 4.00 Inch OD, 3.63 Inch ID, 0.38 Inch Height
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Supplier Part Number
U18-3.62-37B
Alternate Part Numbers
Alternate Part Number
C1DN88
Hey, will this U-seal hold up okay in a hydraulic cylinder on my backhoe? I'm not runnin' it 24/7 or anything, just normal use.
Question by: Merle Y on Aug 24, 2025, 6:34 AM
Designed for use in hydraulic cylinders and linear actuators, this U-seal provides reliable rod or piston sealing, so it should work well for your backhoe application.
Answer by: Customer Support on Aug 25, 2025, 3:40 PM
Does the geometry on this seal matter for how it fits in the groove, or is that more of a depth thing?
Question by: Rick G on Oct 18, 2025, 10:10 AM
For a U-seal, the geometry absolutely plays into fit. This one falls into the deep-type category, meaning the height of 0.375 inches is greater than the cross section of 0.1875 inches. That ratio affects how the seal sits and loads inside the groove, so you want to confirm your groove dimensions match before installation. The outer diameter is 4.000 inches and the inner diameter is 3.625 inches, so measure your bore and rod carefully to make sure you're working with the right clearances.
Answer by: Customer Support on Oct 20, 2025, 6:43 AM
got a cylinder that takes a 3.625 id u-cup, is this the right one or am i off a hair
Question by: Dean C on Dec 30, 2025, 11:26 AM
Match the seal dimensions to what your cylinder calls for: 3.625 inch ID, 4.000 inch OD, and 0.375 inch height with a 0.1875 inch cross section. If your old seal measures out at 3.625 ID, this is the same size.
Answer by: Customer Support on Dec 31, 2025, 11:31 AM
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