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ST Style Urethane Wiper Ring, 1.38 Inch Rod Diameter, 1.75 Inch Wiper OD, 3/16 Inch Base Thickness

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Description & Features

Designed for rod wiping applications in hydraulic cylinders, this urethane seal fits a 1.375-inch rod diameter with a 1.75-inch OD and a 3/16-inch base thickness. The ST Style Urethane Wiper Ring is manufactured by Hercules Sealing Products and carries catalog number C1DL28.

Urethane construction provides a service temperature range of -65°F to 220°F, making it suitable for a broad range of industrial hydraulic equipment. A fluorocarbon version (V suffix) is also available for higher-temperature environments up to 400°F where greater thermal resistance is required.

Wiper rings in this style are used to exclude contaminants from the rod as it retracts into the cylinder, helping to protect internal sealing components from particulate ingestion and moisture intrusion.

SKU: ST-137

Supplier Part Number (MPN): ST-137

Alternate Part Numbers: C1DL28, MI-00968976, MINO-00407X20080

Specifications

Brand
HERCULES® SEALING PRODUCTS
Dimensions
3/16 in H
Durometer
90
Inside Diameter
1.38 in
Material
Urethane
Series
ST Series

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Product Questions & Answers (3)

Question by: Glen A on Aug 5, 2025, 10:27 AM
What size rod does this wiper ring fit? Just want to make sure it's gonna work for my cylinder.
Answer by: Customer Support on Aug 7, 2025, 9:35 AM
This wiper ring is designed for a 1.375-inch rod diameter. The outer diameter of the wiper itself is 1.75 inches, with a base thickness of 3/16 inch.
Question by: Lance W on Jun 28, 2025, 4:18 PM
got a 1-3/8 rod on a cylinder, is this the wiper that matches it?
Answer by: Customer Support on Jun 29, 2025, 4:30 PM
The key callouts are a 1.375 inch rod diameter, a 1.75 inch wiper OD, and a 3/16 inch base thickness, which is what this ST style wiper ring is sized for.
Question by: Freddie E on Dec 13, 2025, 8:16 PM
Got a cylinder here with a 1.375 rod and the old wiper finally gave out. This ST-137 the right drop-in replacement size-wise?
Answer by: Customer Support on Dec 15, 2025, 5:24 PM
For a 1.375-inch rod diameter, that part fits exactly. The OD on the wiper measures 1.75 inches with a 3/16-inch base thickness, so if your cylinder bore and gland were built around those dimensions originally, this will seat the same way the original did. Hercules catalogs it under C1DL28, so if you have old paperwork with that number on it, you're looking at the same piece.

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