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ST Style Urethane Wiper Ring, 3.50 Inch Rod Diameter, 4.00 Inch Wiper OD, 1/4 Inch Base Thickness

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Description & Features

Designed for durability and efficient sealing, the ST Style Urethane Wiper Ring is an essential component for hydraulic systems. With a precise 3.50-inch rod diameter and a 4.00-inch outer wiper diameter, this wiper ring provides reliable protection against contaminants. Its construction from high-grade urethane ensures excellent performance across a broad temperature range, from -65°F to 220°F, making it suitable for demanding industrial applications.

The 1/4-inch base thickness of the wiper ring contributes to its robust design, ensuring a secure fit and lasting functionality. Manufactured by Hercules Sealing Products, this wiper ring is a trusted choice for maintaining system hygiene and prolonging equipment life. Its compatibility with different materials, such as fluorocarbon for high-temperature applications, adds versatility to its use.

SKU: ST-350

Supplier Part Number (MPN): ST-350

Alternate Part Numbers: C1DL46, MI-00967877, MINO-00407X20028, ST-3.50, ST350

Specifications

Brand
HERCULES® SEALING PRODUCTS
Dimensions
1/4 in H
Durometer
90
Material
Urethane
Series
ST Series

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Product Questions & Answers (3)

Question by: Ralph P on Jul 8, 2025, 6:12 PM
got a cylinder rod that mics out at 3.50, is this the right wiper or am i missin somethin
Answer by: Customer Support on Jul 10, 2025, 6:30 AM
Match the rod diameter and the wiper OD to your gland. This ST style ring is sized for a 3.50 inch rod diameter, has a 4.00 inch wiper OD, and a 1/4 inch base thickness.
Question by: Connie T on Feb 15, 2026, 4:28 PM
I'm replacing a wiper ring on an older hydraulic cylinder. What's the actual rod size this is meant for? Just wanna double-check.
Answer by: Customer Support on Feb 17, 2026, 6:14 AM
This wiper ring is designed to fit a 3.5-inch rod diameter.
Question by: Dwight K on Mar 31, 2026, 1:52 PM
Got a cylinder with a 3.5 inch rod that needs a new wiper, this the right size to replace it?
Answer by: Customer Support on Apr 1, 2026, 6:29 PM
For a 3.50-inch rod diameter, yes, this is the correct fit. The outer wiper diameter runs 4.00 inches with a 1/4-inch base thickness, so as long as your housing is machined to accept those dimensions, it should drop right in without any modification.

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