SC oil seal dimensions are normally specified as shaft diameter × housing bore diameter × seal width, usually in millimeters. For example, an illustrative size of 25 × 40 × 7 mm means a 25 mm shaft, a 40 mm housing bore, and a 7 mm-wide seal. Confirm the equipment drawing, seal profile, material, and operating conditions before ordering: matching the three dimensions alone does not guarantee the right oil seal.
This guide explains how to read SC oil seal size information, choose a suitable design, and prepare a clear purchasing request. At TEBIETE, we work with buyers to review application details and help identify a suitable seal specification for quotation.
This guide is intended for maintenance teams, engineers, distributors, and purchasing professionals sourcing replacement or new-design SC oil seals. It is useful when an existing seal has no readable part number, when a drawing lists only basic dimensions, or when a buyer needs to compare material and profile options. It is not a substitute for the equipment manufacturer’s requirements where those are available.
Oil seal dimensions are commonly written as d × D × b: d is the shaft diameter, D is the housing bore diameter, and b is the seal width. In the illustrative example 25 × 40 × 7 mm, the seal is intended for a nominal 25 mm shaft and a nominal 40 mm bore, with a 7 mm axial width. These figures explain the format only; they do not indicate that this size is suitable for a particular machine.
When taking measurements from a worn part, distinguish nominal design dimensions from measurements affected by wear, corrosion, or damage. Measure the shaft sealing surface and housing bore with suitable measuring equipment, and compare those readings with a drawing or equipment specification when possible. If the original seal is distorted, its measured width or outside diameter may not represent its intended nominal size.
In many seal catalogs, SC refers to a radial shaft seal with a single sealing lip and a rubber-covered outside diameter. A spring may support the primary lip, but naming conventions are not identical across every supplier or catalog. Check the product drawing or construction description rather than relying on the letters alone.
Profile details matter because the seal must suit both the shaft and the housing. Depending on the application, buyers may need to consider a secondary dust lip, a different outer-case design, or another profile. Confirm the required configuration before treating two seals with the same basic dimensions as interchangeable.
Material selection depends on the fluid being sealed, operating temperature, shaft speed, and exposure to environmental conditions. Nitrile rubber is commonly used in general-purpose oil-sealing applications, while other elastomers may be considered when fluid compatibility or temperature requirements differ. The exact limits depend on the compound and seal design, so request application-specific data rather than assuming a universal operating range.
Also assess the shaft surface and motion. A seal designed for a rotating shaft may not be appropriate for a different motion or a rough, damaged, or out-of-specification sealing surface. Where the equipment operates at elevated speed, pressure, or temperature, provide those conditions to the supplier and verify the design against the machine requirements.
Start with the equipment drawing, original part number, or verified nominal dimensions. Record the shaft diameter, housing bore diameter, and available seal width in millimeters, and state whether each value comes from a drawing or a physical measurement. If the machine has a shoulder, recess, or limited installation depth, include that information as well.
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Describe the fluid, expected operating temperature, shaft speed, and whether the seal will encounter dirt, water, or other contaminants. Note if the application is continuous or intermittent and whether pressure is present. These details help a supplier assess whether the basic SC profile and proposed material are appropriate.
Compare the existing seal’s lip arrangement and outside construction with the replacement proposal. Check the direction of the sealing lip and any installation instructions provided for the specific product. Do not assume that a visually similar seal will perform identically if its profile, material, or dimensions differ.
Ask for a drawing or written specification showing dimensions, profile, and material. For repeat orders, retain the approved specification and part reference so that future purchasing requests are consistent. If a seal is custom or the application is unusual, agree on the specification and any validation requirements before production proceeds.
Oil seal pricing can depend on dimensions, profile, material, order quantity, and whether the item is a standard catalog product or requires a custom specification. Minimum order quantities and lead times are supplier- and product-specific, so they should be confirmed during quotation rather than assumed. For planning purposes, tell the supplier your required quantity, target delivery timing, and whether the order is a sample, trial, or repeat purchase.
When comparing quotations, check that each offer covers the same dimensions, profile, material, and packaging requirements. A lower unit price may not represent an equivalent specification if one quote omits an important construction detail. Request clarification in writing where any technical or commercial item is not explicit.
A capable supplier should be able to review the dimensions and application details you provide and clarify any missing information before quoting. Ask whether the quotation identifies the profile, material, and nominal dimensions, and whether a drawing or product data sheet can be provided for review. For repeat procurement, also confirm how the approved specification and product identification will be maintained across orders.
TEBIETE supports B2B oil seal sourcing by reviewing buyer-provided requirements and discussing suitable product specifications for quotation. To help us assess your request, share the basic size, application fluid, temperature, shaft speed, desired profile, quantity, and any existing drawing or part reference. If some details are unknown, identify what has been measured and what still needs confirmation.
To select an SC oil seal, begin with the shaft diameter, housing bore diameter, and seal width, then confirm the profile, material, and operating conditions. The illustrative size of 25 × 40 × 7 mm shows how dimensions are written, but the correct product depends on the equipment and application—not on size alone. Before placing an order, compare the proposed specification with the machine drawing or existing approved part.
Your next step is to prepare a dimensioned drawing or a clear specification with application details and quantity. Send it to TEBIETE for a quotation and technical review of the requested configuration. If you are replacing an unidentified seal, include photos and measurements while noting any uncertainty so the specification can be checked before procurement.
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