Select Hydraulic Seal Model:

USH UPH USI UPI UN UHS UNS DHS JA WIPER A1 LBI DKB FA J D-8 K03 K18 K21 K35 K50 K54 K68 K701 K703 K704 H605 H601 H606 H54 H740 H754 H770 SPGO SPGW SPG SPN KZT KDAS PTFE GUIDE STRIP WR

HYDRAULIC SEAL SIZE CHART

Dimension search and technical specifications for over 40 Hydraulic Seal models

What is a Hydraulic Seal?

A Hydraulic Seal is a critical engineering component used in hydraulic cylinders to seal fluid openings between various components. They retain pressurized hydraulic fluid within cylinders (Piston Seals and Rod Seals) while keeping contaminants and debris out (Wiper Seals).

Crafted from resilient elastomeric materials such as Polyurethane (PU), NBR, and Viton, hydraulic seals endure operating pressures up to 400+ bar and withstand continuous friction in construction, industrial, and agricultural machinery.

Hydraulic Cylinder Seal Placement

Hydraulic Cylinder Seal Placement

How to Measure Dimensions (ID × OD × THK)

How to Measure Hydraulic Seals

Select a Hydraulic Seal Model Above to View Sizes 👆

Click on any model above (e.g., USH, UPH, DHS, UN) to view technical specifications, pressure limits, and full dimension tables.

Frequently Asked Questions (FAQ) - Hydraulic Seals

What is a Hydraulic Seal and what is its role?
A hydraulic seal retains pressurized fluid within a hydraulic cylinder, preventing fluid from leaking across the piston chamber (Piston Seal) or leaking past the rod into the environment (Rod Seal), ensuring optimal hydraulic force and mechanical efficiency.
What operating temperatures and pressures can hydraulic seals withstand?
This depends on the material chosen. Polyurethane (PU) seals typically support pressures up to 400 bar and temperatures around -35°C to +100°C. For higher temperature requirements (up to 200°C), consider Viton (FKM) or PTFE compounds.
What causes hydraulic seal failure and leaks?
Primary causes include: 1. Natural seal wear or material hardening over time, 2. Abrasive contamination caused by worn wiper seals, 3. Operating temperatures exceeding material limits, and 4. Contaminated or degraded hydraulic fluid.
How can I order hydraulic seals from SEALTHAI and do you offer cross-referencing?
We offer complimentary cross-referencing assistance. You can search by dimension directly on sealthai.com or message our engineering staff via LINE OA: @sealthai. We carry brands like Hallite, Kastas, and quality alternatives with ready stock.