The DSU.125-.750 reference
These u cup seals are the DSU.125-.750 reference in 90-durometer urethane. The exact listing gives an inside diameter of 0.750 inch, outside diameter of 1.000 inch and height of 0.125 inch. The corresponding recorded metric dimensions are 19.05 mm, 25.40 mm and 3.18 mm.
The profile designation is part of the specification. This page is for the DSU standard, unloaded configuration, rather than a general selection of U-cup styles. Keep the profile, dimensions and material together when matching the seal with an equipment drawing.
Standard versus loaded u cup seals
The source's family guide distinguishes standard U-cups from loaded profiles containing an O-ring energizer. It describes DSU as the standard beveled-lip type without that energizer. Do not assume that a separate O-ring is missing from this product or add one to the request based on an illustration of another profile.
The guide lists loaded S, SB, D and DB types separately, with different construction and operating information. Those family descriptions provide context for comparing profiles; they are not additional variants included under DSU.125-.750.
Read the seal dimensions from the correct features
The family guide defines U-cup cross section at the bottom of the cup and measures inside and outside diameters from that base. This matters because the curved lip can make a visual estimate misleading. A measurement across a lip is not automatically the dimension used in the size listing.
For the researched reference, the listed inside diameter is 3/4 inch, outside diameter is 1 inch and height is 1/8 inch. Preserve those labels when comparing another drawing. Do not replace the height with a nearby product's deeper profile simply because its inside diameter matches.
The specified material
This exact seal is 90-durometer urethane. The family table identifies other profiles using 95-durometer urethane and a separate nitrile energizer. The material and hardness from those rows should not be copied onto the DSU product.
Material selection still needs to match the equipment and working fluid. The page identifies the researched compound family; it does not certify that every urethane seal is equivalent or that this component is appropriate for any application with the same nominal shaft or bore size.
Published DSU operating information
The source's DSU family row lists a temperature range of −40°F to +230°F, pressure from 0 to 4,000 psi and speed of 3 feet per second. These are published family values, not an approval of a particular installed system. The actual seal, housing, motion and fluid need to be considered together.
Do not transfer a pressure value from a loaded-profile row to DSU.125-.750. Likewise, these family values do not specify an installation method or guarantee sealing performance throughout every combination of the listed conditions.
Compare u cup seals by the complete arrangement
A replacement review should identify the original profile first, then compare material, inside diameter, outside diameter and height. Keep the equipment's gland geometry and installation instructions available. A dimensional match alone is not enough to establish that a different lip or energizer arrangement is suitable.
The source describes the DSU profile as relying on system pressure to maintain sealing contact. That construction is one reason the profile must remain part of the reference instead of being reduced to a list of three dimensions.
Illustration and included component
The illustration shows the general U-shaped form. It is not a dimensional drawing, a measurement of the sealing lip or a photograph of an inspected production unit. Use the written specification and source drawing when deciding which exact component should be checked.
One proposed request unit represents one DSU.125-.750 seal. It does not include a cylinder, piston, rod, external wiper or complete maintenance kit. Other components must be identified separately; they should not be added solely because they appear with a similar seal in a diagram.
Quantity and product identity
Requested quantity is the number of this exact seal that you want checked for availability. Two units mean two DSU.125-.750 seals. There is no size assortment or selectable alternative compound in this request.
Keeping the complete SKU on the review screen helps distinguish the component from a larger U-cup with the same profile name. A different size or loaded arrangement requires a separate verified product reference before any purchase.
Request availability
Enter your name, email and requested quantity, then review the product before confirming. The form expresses interest in the exact item; it does not reserve inventory, set a final price or create an order.
Availability, final price and delivery timing will be confirmed before any purchase. No payment is collected and no charge or fulfillment is authorized. If the product identity needs clarification, that must be resolved separately rather than treating confirmation as approval to substitute another seal.
Questions about DSU.125-.750
- Are these u cup seals loaded with an O-ring?
- No. DSU is the standard, unloaded beveled profile. An O-ring energizer is not represented as included.
- What hardness is the urethane?
- The exact DSU.125-.750 listing specifies 90 durometer.
- Is the ⅛-inch dimension the inside diameter?
- No. It is the height. Inside diameter is 3/4 inch and outside diameter is 1 inch.
- Can a deeper U-cup be selected on this page?
- This page records interest only in the listed 0.125-inch-height reference. Another geometry needs a separate verified product.
- Do the family operating values approve my cylinder?
- No. They are published component-family information. The actual equipment, installation and operating conditions still require assessment.