To select a YY Type Face Seal correctly, start with the shaft or bore diameter, then confirm the housing dimensions, seal cross-section, operating speed, pressure, temperature, and fluid. A size chart is useful only when its dimensions match the equipment drawing and the seal’s installation method. I recommend treating catalog dimensions as a starting point, not as a substitute for checking the original equipment manufacturer’s specification. At ZHONO, we help B2B buyers convert measured dimensions and operating conditions into a practical YY Type Face Seal selection.
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This guide is intended for purchasing teams, maintenance engineers, OEM designers, and distributors sourcing YY Type Face Seals for general mechanical equipment. It is especially useful when a removed seal has no readable marking or when the replacement must be selected from a dimensional drawing. The guide also helps buyers prepare the technical information needed for a quotation. It is not a replacement for a validated assembly drawing or application test.
A YY Type Face Seal is a mechanical sealing component designed to limit the movement of lubricant or process fluid between relatively moving parts. Depending on the design, it may use a sealing lip, contact surface, elastic element, or a combination of these features. The correct seal must maintain effective contact without creating excessive friction, heat, or installation stress. Its performance therefore depends on both dimensional fit and operating conditions.
Most YY Type Face Seal selections require more than one diameter. The primary dimensions commonly include the shaft diameter, housing bore, seal outside diameter, axial installation height, and available groove or seat width. Some designs also require the face width, spring position, lip orientation, or a specific clearance between rotating and stationary components. If any of these values are unknown, I recommend measuring the housing and shaft rather than relying only on the old seal.
| Dimension or condition | What to measure or confirm | Why it matters |
|---|---|---|
| Shaft or bore diameter | Diameter at the sealing or locating surface | Determines the basic nominal size and contact fit |
| Housing bore | Internal diameter of the seal seat | Controls external retention and installation security |
| Axial height | Available depth from the mounting face | Prevents interference with adjacent components |
| Groove or seat width | Usable axial or radial installation space | Confirms whether the seal can be seated correctly |
| Operating conditions | Speed, pressure, temperature, and medium | Determines material and design suitability |
The chart below is a measurement and selection reference rather than a universal YY Type Face Seal catalog. YY Type designs can vary by supplier, equipment model, material, and drawing standard, so the final part number must be confirmed against a technical drawing. Use the nominal shaft or bore diameter as the initial search value, then verify the remaining dimensions. For example, a measured 25 mm shaft does not automatically mean that every 25 mm YY Type Face Seal will fit the housing.
| Nominal reference size | Typical buyer check | Required confirmation before ordering |
|---|---|---|
| 12 mm | Small shaft or compact rotating assembly | Housing bore, axial height, speed, and lubricant |
| 20 mm | General light-duty mechanical equipment | Face geometry, fit, temperature, and installation method |
| 25 mm | Common medium-size equipment reference | Actual shaft condition, bore tolerance, and operating speed |
| 40 mm | Larger shaft or industrial drive arrangement | Radial clearance, pressure exposure, and seal material |
| 60 mm | Large rotating or process equipment reference | Drawing approval, installation space, and dynamic load |
These reference sizes are not claimed product dimensions or a complete range. They show how buyers can organize a size inquiry when the nominal diameter is known. A complete request should include the shaft diameter in millimeters, housing bore in millimeters, installation height in millimeters, and any relevant tolerance information. If the equipment uses inches, provide the original inch dimensions instead of converting and rounding them without confirmation.
Material selection should follow the fluid, temperature, speed, and chemical exposure rather than price alone. Common elastomer choices may include nitrile rubber for selected oil applications, fluoroelastomer for higher chemical or temperature resistance, and other compounds specified by the application. The sealing or wear-facing material may also vary, particularly where dry running, abrasive particles, or elevated friction is possible. I recommend asking the supplier to confirm compound compatibility for the actual medium.
For oil-lubricated equipment, the first checks are oil type, temperature range, shaft speed, and whether the seal runs continuously or intermittently. For water-based fluids, coolants, dust, or abrasive media, contamination control and material compatibility become more important. If the application operates near 120°C, for example, the buyer should not select a compound solely because its dimensions match; the supplier must verify that the material and design are suitable for that temperature. Likewise, a speed of 1,800 rpm should be treated as an operating requirement that may affect friction, heat, and expected service life.
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Measure the shaft or bore at several positions to identify wear, taper, or deformation. Record the housing bore, available depth, groove width, and the direction in which the seal is installed. When the original seal is damaged, photograph its orientation and note whether the sealing face points toward the fluid or away from it. A measurement resolution of 0.01 mm may be useful for inspection work, but the required tolerance depends on the equipment drawing and the measuring method.
List the fluid, temperature range, rotational speed, pressure, contamination level, and duty cycle. Also state whether the shaft reverses direction, starts and stops frequently, or experiences vibration or axial movement. These details can change the recommended profile or compound even when two seals have identical nominal diameters. If the operating data is incomplete, label it as unknown rather than making an optimistic assumption.
Compare the measured dimensions with the supplier’s drawing, including all critical diameters, heights, contact surfaces, and tolerances. Confirm that the selected material is compatible with the medium and temperature, and ask whether the face or lip design is intended for the application’s speed and pressure. For replacement work, provide the original equipment model and the old seal marking when available. This information can reduce the risk of selecting a dimensionally similar but functionally different part.
Check chamfers, sharp edges, surface finish, shaft damage, and available installation tools before placing a production order. A correct seal can still leak if the shaft has a groove, the housing is scored, or the seal is installed in the wrong orientation. Protect the sealing edge during assembly and avoid forcing the part over threads, keyways, or sharp shoulders. The supplier should be told about any unusual assembly limitation.
The most common error is ordering by shaft diameter alone. Buyers may also reuse a material that worked in a different fluid, overlook shaft wear, or confuse axial height with face width. Another frequent mistake is assuming that a lower unit price represents lower total cost when premature leakage could create downtime, rework, or contamination. I recommend approving the drawing and application conditions before comparing quotations.
YY Type Face Seal pricing depends on size, compound, face design, tooling requirements, packaging, quantity, and inspection needs. A standard production item may be easier to source than a customized profile, while special materials or new tooling can increase both minimum order quantity and preparation time. Exact lead time should be confirmed in the quotation because it can change with production scheduling and material availability. Buyers should request separate pricing for samples, trial orders, repeat orders, and annual volume where applicable.
At ZHONO, I approach YY Type Face Seal inquiries by first reviewing the dimensional and operating information rather than recommending a part from a single measurement. Our support can include size confirmation, drawing comparison, material discussion, quotation preparation, packaging coordination, and export-order communication. When a standard option is not appropriate, we can review whether a different profile or customized specification should be considered. Final suitability remains subject to the confirmed drawing, materials, and application conditions.
The right YY Type Face Seal is the one that matches both the equipment dimensions and the actual operating environment. Start with accurate measurements, verify the complete installation space, then select the material and profile according to fluid, temperature, speed, pressure, and contamination. Before placing a production order, request a drawing or dimensional confirmation from the supplier. To begin with ZHONO, send the nominal size, measured dimensions, application medium, operating conditions, quantity, and delivery requirement so we can help prepare a more reliable YY Type Face Seal selection and quotation.
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