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Polyurethane U-Seal, 2.13 Inch OD, 1.75 Inch ID, 0.19 Inch Height

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Description & Features

Manufactured by Hercules Sealing Products, this polyurethane U-seal features a beveled lip design that provides effective film breaking across a wide range of hydraulic applications. The seal is rated for pressures from 0 to 6,000 PSI and handles temperatures between -65°F and 220°F, making it suitable for demanding reciprocating rod and piston service.

The Polyurethane U-Seal, 2.13 Inch OD, 1.75 Inch ID, 0.19 Inch Height follows a standard SQB profile where height and cross section are equal. Urethane construction offers good wear resistance and durability in hydraulic cylinder environments where consistent sealing performance is required.

SKU: U18-1.75-SQB

Supplier Part Number (MPN): U18-1.75-SQB

Alternate Part Numbers: C1DN58, MI-01811095, MINO-00407Q30865

Specifications

Cross Section
0.1875 in
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Pack Size
1.00
UOM
EA
H
0.1875 in
I.D.
1.75 in
O.D.
2.125 in
Supplier Part Number
U18-1.75-SQB
Alternate Part Numbers
Alternate Part Number C1DN58, Alternate Part Number MI-01811095, Alternate Part Number MINO-00407Q30865
Product Weight
0.01 lbs

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Polyurethane U-Seal, 3.38 Inch OD, 3.00 Inch ID, 0.19 Inch Height

U18-3.00 Polyurethane U-Seal

0.1875 in

3 in

3.375 in

0.1875 in

Polyurethane U-Seal, 3.38 Inch OD, 3.00 Inch ID, 0.38 Inch Height

U18-3.00-37B Polyurethane U-Seal

0.1875 in

3 in

3.375 in

0.375 in

Polyurethane U-Seal, 3.50 Inch OD, 3.13 Inch ID, 0.38 Inch Height

U18-3.12-37B Polyurethane U-Seal

0.1875 in

3.125 in

3.5 in

0.375 in

Polyurethane U-Seal, 3.50 Inch OD, 3.13 Inch ID, 0.19 Inch Height

U18-3.12-SQB Polyurethane U-Seal

0.1875 in

3.125 in

3.5 in

0.1875 in

Polyurethane U-Seal, 3.88 Inch OD, 3.50 Inch ID, 0.38 Inch Height

U18-3.50-37B Polyurethane U-Seal

0.1875 in

3.5 in

3.875 in

0.375 in

Polyurethane U-Seal, 4.00 Inch OD, 3.63 Inch ID, 0.38 Inch Height

U18-3.62-37B Polyurethane U-Seal

0.1875 in

3.625 in

4 in

0.375 in

Polyurethane U-Seal, 4.00 Inch OD, 3.63 Inch ID, 0.19 Inch Height

U18-3.62-SQB Polyurethane U-Seal

0.1875 in

3.625 in

4 in

0.1875 in

Polyurethane U-Seal, 4.38 Inch OD, 4.00 Inch ID, 0.38 Inch Height

U18-4.00-37B Polyurethane U-Seal

0.1875 in

4 in

4.375 in

0.375 in

Polyurethane U-Seal, 1.25 Inch OD, 0.75 Inch ID, 0.25 Inch Height

U25-0.75 Polyurethane U-Seal

0.25 in

0.75 in

1.25 in

0.25 in

Polyurethane U-Seal, 1.44 Inch OD, 0.81 Inch ID, 0.25 Inch Height

U25-0.93 Polyurethane U-Seal

0.25 in

0.8125 in

1.438 in

0.25 in

Polyurethane U-Seal, 1.50 Inch OD, 1.00 Inch ID, 0.38 Inch Height

U25-1.00-37B Polyurethane U-Seal

0.25 in

1 in

1.5 in

0.375 in

Polyurethane U-Seal, 1.50 Inch OD, 1.00 Inch ID, 0.25 Inch Height

U25-1.00-SQB Polyurethane U-Seal

0.25 in

1 in

1.5 in

0.25 in

Polyurethane U-Seal, 1.63 Inch OD, 1.06 Inch ID, 0.25 Inch Height

U25-1.12 Polyurethane U-Seal

0.25 in

1.0625 in

1.625 in

0.25 in

Polyurethane U-Seal, 1.63 Inch OD, 1.06 Inch ID, 0.38 Inch Height

U25-1.12-37B Polyurethane U-Seal

0.25 in

1.0625 in

1.625 in

0.375 in

Polyurethane U-Seal, 1.69 Inch OD, 0.19 Inch ID, 0.25 Inch Height

U25-1.18 Polyurethane U-Seal

0.25 in

0.188 in

1.688 in

0.25 in

Polyurethane U-Seal, 1.75 Inch OD, 1.25 Inch ID, 0.25 Inch Height

U25-1.25-SQB Polyurethane U-Seal

0.25 in

1.25 in

1.75 in

0.25 in

Polyurethane U-Seal, 1.88 Inch OD, 1.38 Inch ID, 0.25 Inch Height

U25-1.37 Polyurethane U-Seal

0.25 in

1.375 in

1.875 in

0.25 in

Polyurethane U-Seal, 1.88 Inch OD, 1.38 Inch ID, 0.38 Inch Height

U25-1.37-37B Polyurethane U-Seal

0.25 in

1.375 in

1.875 in

0.375 in

Polyurethane U-Seal, 2.00 Inch OD, 1.50 Inch ID, 0.31 Inch Height

U25-1.50-31B Polyurethane U-Seal

0.25 in

1.5 in

2 in

0.3125 in

Polyurethane U-Seal, 2.00 Inch OD, 1.50 Inch ID, 0.25 Inch Height

U25-1.50-SQB Polyurethane U-Seal

0.25 in

1.5 in

2 in

0.25 in

Polyurethane U-Seal, 2.25 Inch OD, 1.75 Inch ID, 0.25 Inch Height

U25-1.75 Polyurethane U-Seal

0.25 in

1.75 in

2.25 in

0.25 in

Polyurethane U-Seal, 2.25 Inch OD, 1.75 Inch ID, 0.38 Inch Height

U25-1.75-37B Polyurethane U-Seal

0.25 in

1.75 in

2.25 in

0.375 in

Polyurethane U-Seal, 2.38 Inch OD, 1.88 Inch ID, 0.38 Inch Height

U25-1.87-37B Polyurethane U-Seal

0.25 in

1.875 in

2.375 in

0.375 in

Polyurethane U-Seal, 2.50 Inch OD, 2.00 Inch ID, 0.31 Inch Height

U25-2.00-31B Polyurethane U-Seal

0.25 in

2 in

2.5 in

0.3125 in

Polyurethane U-Seal, 2.50 Inch OD, 2.00 Inch ID, 0.25 Inch Height

U25-2.00-SQB Polyurethane U-Seal

0.25 in

2 in

2.5 in

0.25 in

Polyurethane U-Seal, 2.63 Inch OD, 2.13 Inch ID, 0.38 Inch Height

U25-2.12-37B Polyurethane U-Seal

0.25 in

2.125 in

2.625 in

0.375 in

Polyurethane U-Seal, 2.75 Inch OD, 2.25 Inch ID, 0.25 Inch Height

U25-2.25 Polyurethane U-Seal

0.25 in

2.25 in

2.75 in

0.25 in

Polyurethane U-Seal, 2.75 Inch OD, 2.25 Inch ID, 0.38 Inch Height

U25-2.25-37B Polyurethane U-Seal

0.25 in

2.25 in

2.75 in

0.375 in

Polyurethane U-Seal, 2.88 Inch OD, 2.38 Inch ID, 0.38 Inch Height

U25-2.37-37B Polyurethane U-Seal

0.25 in

2.375 in

2.875 in

0.375 in

Polyurethane U-Seal, 3.00 Inch OD, 2.50 Inch ID, 0.25 Inch Height

U25-2.50-SQB Polyurethane U-Seal

0.25 in

2.5 in

3 in

0.25 in

Polyurethane U-Seal, 3.13 Inch OD, 2.63 Inch ID, 0.38 Inch Height

U25-2.62-37B Polyurethane U-Seal

0.25 in

2.625 in

3.125 in

0.375 in

Polyurethane U-Seal, 3.25 Inch OD, 2.75 Inch ID, 0.38 Inch Height

U25-2.75-37B Polyurethane U-Seal

0.25 in

2.75 in

3.25 in

0.375 in

Polyurethane U-Seal, 3.25 Inch OD, 2.75 Inch ID, 0.25 Inch Height

U25-2.75-SQB Polyurethane U-Seal

0.25 in

2.75 in

3.25 in

0.25 in

Polyurethane U-Seal, 3.75 Inch OD, 3.25 Inch ID, 0.38 Inch Height

U25-3.25-37B Polyurethane U-Seal

0.25 in

3.25 in

3.75 in

0.375 in

Polyurethane U-Seal, 4.00 Inch OD, 3.50 Inch ID, 0.25 Inch Height

U25-3.50 Polyurethane U-Seal

0.25 in

3.5 in

4 in

0.25 in

Polyurethane U-Seal, 4.00 Inch OD, 3.50 Inch ID, 0.25 Inch Height

U25-3.50-SQB Polyurethane U-Seal

0.25 in

3.5 in

4 in

0.25 in

Polyurethane U-Seal, 4.25 Inch OD, 3.75 Inch ID, 0.38 Inch Height

U25-3.75-37B Polyurethane U-Seal

0.25 in

3.75 in

4.25 in

0.375 in

Polyurethane U-Seal, 4.25 Inch OD, 3.75 Inch ID, 0.25 Inch Height

U25-3.75-SQB Polyurethane U-Seal

0.25 in

3.75 in

4.25 in

0.25 in

Polyurethane U-Seal, 4.50 Inch OD, 4.00 Inch ID, 0.38 Inch Height

U25-4.00-37B Polyurethane U-Seal

0.25 in

4 in

4.5 in

0.375 in

Polyurethane U-Seal, 4.50 Inch OD, 4.00 Inch ID, 0.50 Inch Height

U25-4.00-50D Polyurethane U-Seal

0.25 in

4 in

4.5 in

0.5 in

Polyurethane U-Seal, 4.50 Inch OD, 4.00 Inch ID, 0.56 Inch Height

U25-4.00-56B Polyurethane U-Seal

0.25 in

4 in

4.5 in

0.5625 in

Polyurethane U-Seal, 5.00 Inch OD, 4.50 Inch ID, 0.38 Inch Height

U25-4.50-37B Polyurethane U-Seal

0.25 in

4.5 in

5 in

0.375 in

Polyurethane U-Seal, 5.00 Inch OD, 4.50 Inch ID, 0.56 Inch Height

U25-4.50-56B Polyurethane U-Seal

0.25 in

4.5 in

5 in

0.5625 in

Polyurethane U-Seal, 5.00 Inch OD, 4.50 Inch ID, 0.63 Inch Height

U25-4.50-62B Polyurethane U-Seal

0.25 in

4.5 in

5 in

0.625 in

Polyurethane U-Seal, 5.50 Inch OD, 5.00 Inch ID, 0.38 Inch Height

U25-5.00-37B Polyurethane U-Seal

0.25 in

5 in

5.5 in

0.375 in

Polyurethane U-Seal, 6.00 Inch OD, 5.50 Inch ID, 0.25 Inch Height

U25-5.50 Polyurethane U-Seal

0.25 in

5.5 in

6 in

0.25 in

Polyurethane U-Seal, 6.00 Inch OD, 5.50 Inch ID, 0.38 Inch Height

U25-5.50-37B Polyurethane U-Seal

0.25 in

5.5 in

6 in

0.375 in

Polyurethane U-Seal, 6.00 Inch OD, 5.50 Inch ID, 0.56 Inch Height

U25-5.50-56B Polyurethane U-Seal

0.25 in

5.5 in

6 in

0.5625 in

Polyurethane U-Seal, 1.63 Inch OD, 1.00 Inch ID, 0.50 Inch Height

U31-1.00-50B Polyurethane U-Seal

0.3125 in

1 in

1.625 in

0.5 in

Polyurethane U-Seal, 1.88 Inch OD, 1.25 Inch ID, 0.31 Inch Height

U31-1.25 Polyurethane U-Seal

0.3125 in

1.25 in

1.875 in

0.3125 in

Polyurethane U-Seal, 1.88 Inch OD, 1.25 Inch ID, 0.38 Inch Height

U31-1.25-37B Polyurethane U-Seal

0.3125 in

1.25 in

1.875 in

0.375 in

Polyurethane U-Seal, 2.00 Inch OD, 1.38 Inch ID, 0.38 Inch Height

U31-1.37-37B Polyurethane U-Seal

0.3125 in

1.375 in

2 in

0.375 in

Polyurethane U-Seal, 2.00 Inch OD, 1.38 Inch ID, 0.31 Inch Height

U31-1.37-SQB Polyurethane U-Seal

0.3125 in

1.375 in

2 in

0.3125 in

Polyurethane U-Seal, 2.13 Inch OD, 1.50 Inch ID, 0.31 Inch Height

U31-1.50 Polyurethane U-Seal

0.3125 in

1.5 in

2.125 in

0.3125 in

Polyurethane U-Seal, 2.38 Inch OD, 1.75 Inch ID, 0.38 Inch Height

U31-1.75-37B Polyurethane U-Seal

0.3125 in

1.75 in

2.375 in

0.375 in

Polyurethane U-Seal, 2.50 Inch OD, 1.88 Inch ID, 0.31 Inch Height

U31-1.87 Polyurethane U-Seal

0.3125 in

1.875 in

2.5 in

0.3125 in

Polyurethane U-Seal, 2.63 Inch OD, 2.00 Inch ID, 0.31 Inch Height

U31-2.00 Polyurethane U-Seal

0.3125 in

2 in

2.625 in

0.3125 in

Polyurethane U-Seal, 2.63 Inch OD, 2.00 Inch ID, 0.50 Inch Height

U31-2.00-50B Polyurethane U-Seal

0.3125 in

2 in

2.625 in

0.5 in

Polyurethane U-Seal, 2.88 Inch OD, 2.25 Inch ID, 0.50 Inch Height

U31-2.25-50B Polyurethane U-Seal

0.3125 in

2.25 in

2.875 in

0.5 in

Polyurethane U-Seal, 3.00 Inch OD, 2.38 Inch ID, 0.31 Inch Height

U31-2.37 Polyurethane U-Seal

0.3125 in

2.375 in

3 in

0.3125 in

Polyurethane U-Seal, 3.13 Inch OD, 2.50 Inch ID, 0.31 Inch Height

U31-2.50 Polyurethane U-Seal

0.3125 in

2.5 in

3.125 in

0.3125 in

Polyurethane U-Seal, 3.13 Inch OD, 2.50 Inch ID, 0.50 Inch Height

U31-2.50-50B Polyurethane U-Seal

0.3125 in

2.5 in

3.125 in

0.5 in

Polyurethane U-Seal, 3.38 Inch OD, 2.75 Inch ID, 0.31 Inch Height

U31-2.75 Polyurethane U-Seal

0.3125 in

2.75 in

3.375 in

0.3125 in

Polyurethane U-Seal, 3.38 Inch OD, 2.75 Inch ID, 0.50 Inch Height

U31-2.75-50B Polyurethane U-Seal

0.3125 in

2.75 in

3.375 in

0.5 in

Polyurethane U-Seal, 3.50 Inch OD, 2.88 Inch ID, 0.31 Inch Height

U31-2.87 Polyurethane U-Seal

0.3125 in

2.875 in

3.5 in

0.3125 in

Polyurethane U-Seal, 3.63 Inch OD, 3.00 Inch ID, 0.50 Inch Height

U31-3.00-50B Polyurethane U-Seal

0.3125 in

3 in

3.625 in

0.5 in

Polyurethane U-Seal, 4.00 Inch OD, 3.38 Inch ID, 0.50 Inch Height

U31-3.37-50B Polyurethane U-Seal

0.3125 in

3.375 in

4 in

0.5 in

Polyurethane U-Seal, 4.63 Inch OD, 4.00 Inch ID, 0.31 Inch Height

U31-4.00 Polyurethane U-Seal

0.3125 in

4 in

4.625 in

0.3125 in

Polyurethane U-Seal, 4.63 Inch OD, 4.00 Inch ID, 0.56 Inch Height

U31-4.00-56B Polyurethane U-Seal

0.3125 in

4 in

4.625 in

0.5625 in

Polyurethane U-Seal, 5.00 Inch OD, 4.38 Inch ID, 0.31 Inch Height

U31-4.37 Polyurethane U-Seal

0.3125 in

4.375 in

5 in

0.3125 in

Polyurethane U-Seal, 5.13 Inch OD, 4.50 Inch ID, 0.31 Inch Height

U31-4.50 Polyurethane U-Seal

0.3125 in

4.5 in

5.125 in

0.3125 in

Polyurethane U-Seal, 2.00 Inch OD, 1.25 Inch ID, 0.38 Inch Height

U37-1.25 Polyurethane U-Seal

0.375 in

1.25 in

2 in

0.375 in

Polyurethane U-Seal, 2.50 Inch OD, 1.75 Inch ID, 0.38 Inch Height

U37-1.75 Polyurethane U-Seal

0.375 in

1.75 in

2.5 in

0.375 in

Polyurethane U-Seal, 3.25 Inch OD, 2.50 Inch ID, 0.50 Inch Height

U37-2.50-50B Polyurethane U-Seal

0.375 in

2.5 in

3.25 in

0.5 in

Polyurethane U-Seal, 3.50 Inch OD, 2.75 Inch ID, 0.38 Inch Height

U37-2.75 Polyurethane U-Seal

0.375 in

2.75 in

3.5 in

0.375 in

Polyurethane U-Seal, 4.00 Inch OD, 3.25 Inch ID, 0.50 Inch Height

U37-3.25-50B Polyurethane U-Seal

0.375 in

3.25 in

4 in

0.5 in

Polyurethane U-Seal, 4.25 Inch OD, 3.50 Inch ID, 0.38 Inch Height

U37-3.50 Polyurethane U-Seal

0.375 in

3.5 in

4.25 in

0.375 in

Polyurethane U-Seal, 4.50 Inch OD, 3.75 Inch ID, 0.50 Inch Height

U37-3.75-50D Polyurethane U-Seal

0.375 in

3.75 in

4.5 in

0.5 in

Polyurethane U-Seal, 4.75 Inch OD, 4.00 Inch ID, 0.63 Inch Height

U37-4.00-62B Polyurethane U-Seal

0.375 in

4 in

4.75 in

0.625 in

Polyurethane U-Seal, 5.00 Inch OD, 4.25 Inch ID, 0.50 Inch Height

U37-4.25-50D Polyurethane U-Seal

0.375 in

4.25 in

5 in

0.5 in

Polyurethane U-Seal, 5.00 Inch OD, 4.25 Inch ID, 0.63 Inch Height

U37-4.25-62B Polyurethane U-Seal

0.375 in

4.25 in

5 in

0.625 in

Polyurethane U-Seal, 5.00 Inch OD, 4.25 Inch ID, 0.38 Inch Height

U37-4.25-SQB Polyurethane U-Seal

0.375 in

4.25 in

5 in

0.375 in

Polyurethane U-Seal, 5.25 Inch OD, 4.50 Inch ID, 0.63 Inch Height

U37-4.50-62B Polyurethane U-Seal

0.375 in

4.5 in

5.25 in

0.625 in

Polyurethane U-Seal, 5.75 Inch OD, 5.00 Inch ID, 0.63 Inch Height

U37-5.00-62B Polyurethane U-Seal

0.375 in

5 in

5.75 in

0.625 in

Polyurethane U-Seal, 6.00 Inch OD, 5.25 Inch ID, 0.38 Inch Height

U37-5.25 Polyurethane U-Seal

0.375 in

5.25 in

6 in

0.375 in

Polyurethane U-Seal, 6.00 Inch OD, 5.25 Inch ID, 0.50 Inch Height

U37-5.25-50D Polyurethane U-Seal

0.375 in

5.25 in

6 in

0.5 in

Polyurethane U-Seal, 7.00 Inch OD, 6.25 Inch ID, 0.50 Inch Height

U37-6.25-50D Polyurethane U-Seal

0.375 in

6.25 in

7 in

0.5 in

Polyurethane U-Seal, 3.00 Inch OD, 2.00 Inch ID, 0.50 Inch Height

U50-2.00-SQB Polyurethane U-Seal

0.5 in

2 in

3 in

0.5 in

Polyurethane U-Seal, 3.50 Inch OD, 2.50 Inch ID, 0.50 Inch Height

U50-2.50 Polyurethane U-Seal

0.5 in

2.5 in

3.5 in

0.5 in

Product Questions & Answers (3)

Question by: Rex B on Jun 2, 2025, 1:55 PM
what's the pressure rating on this seal? got a cylinder running pretty hard and need something that won't give out on me
Answer by: Customer Support on Jun 3, 2025, 9:40 PM
Rated from 0 up to 6,000 PSI, so it covers most heavy-duty hydraulic cylinder work without issue. The polyurethane construction holds up well under sustained pressure, and the beveled lip design helps maintain consistent film breaking across that whole range. For reciprocating rod and piston service especially, it's a solid fit.
Question by: Lynn L on Aug 24, 2025, 2:04 PM
trying to match up a u-seal i pulled out of a cylinder. if my measurements are 1.75 id, 2.125 od, and right around 3/16 tall, is this the same one?
Answer by: Customer Support on Aug 25, 2025, 8:13 PM
Match the dimensions and profile and it lines up. This U-seal is 1.75 inch ID, 2.125 inch OD, with a 0.1875 inch height and cross section, and it follows the SQB style where height and cross section are equal.
Question by: Travis S on Jan 15, 2026, 5:11 PM
What's the deal with that beveled lip? Does it really make a difference?
Answer by: Customer Support on Jan 17, 2026, 6:47 AM
That beveled lip design is there to help break the fluid film, which improves the seal's performance across different hydraulic jobs.