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Custom Radial Shaft Seal: Sizing, Materials, Profiles and Quote Requirements
Quick Answer: A custom radial shaft seal is specified by shaft diameter, housing bore, width, lip profile, material, fluid, temperature, speed and pressure. CORASEALS supplies custom radial shaft seals in NBR, HNBR, FKM, EPDM, silicone, PTFE and other materials. Send the shaft diameter, housing bore, width, fluid, temperature, speed, pressure, drawing and required quantity to receive a custom quote.
Procurement and maintenance teams look for a custom radial shaft seal when a standard rotary shaft seal does not match a worn shaft, an oversize bore, a discontinued size or a difficult operating condition. CORASEALS quotes custom radial shaft seals from dimensional data, operating data and the existing seal condition. A custom seal can be a modified TC, SC or TB profile, or a different lip and case construction entirely.
Do not send only a part number for a custom radial shaft seal. Different manufacturers use different code systems for oil seal profiles. A code such as TC can change in lip layout, case material, spring type and dust lip configuration depending on the catalog. The safest request for quotation includes measured dimensions, the old seal photo and the actual service conditions.
For standard radial shaft seal sizes, view the CORASEALS radial shaft seal category on coraseals.com. For custom dimensions, use the RFQ data in the sections below.
Custom Radial Shaft Seal Dimensions and Measuring Data
The main size format for a custom radial shaft seal is inside diameter × outside diameter × width. In many rotary shaft seal drawings, the inside diameter equals the shaft sealing diameter and the outside diameter equals the housing bore. CORASEALS confirms the dimension order before quoting because some users write shaft diameter × housing bore × width instead. Metric and inch units are both accepted. The unit must be marked on the drawing or in the inquiry.
For standard metric seals, ISO 6194 and DIN 3760 commonly define size ranges and tolerances. A custom radial shaft seal may be required when the shaft or housing falls outside those standard ranges, or when the old seal has nonstandard lips, case dimensions or spring loading.
- Shaft diameter at the lip contact area
- Housing bore diameter and bore depth
- Seal width or axial space available
- Shaft surface finish and hardness, if available
- Housing surface finish and chamfer or lead in
- Old seal dimensions, marking, front view, side view and back view
Measure the shaft on the sealing path, not on a corroded step or a heavily worn zone. If the housing bore is out of round, measure in two or more positions and report the largest and smallest values. A custom radial shaft seal can compensate for some dimensional variation, but excessive runout or an out of round condition will still reduce lip life.
Custom Radial Shaft Seal Material Options
Material selection depends on the fluid, peak temperature, shaft speed and contamination. A material that performs well in mineral oil may not perform well in steam, water emulsions, acids or fuels. The table below is a basic selection reference for custom radial shaft seals. The final material must be confirmed by CORASEALS against the full fluid and temperature condition.
| Material | Typical Fluid Exposure | Common Application | Main Limitation |
|---|---|---|---|
| NBR | Mineral oil, grease, water, many hydrocarbons | General rotary shaft sealing | Limited high heat and strong solvent resistance |
| HNBR | Hot oil, R134a, HFC, abrasive oil | Automotive and mobile hydraulic rotary components | Not suitable for strong polar solvents |
| FKM | Mineral oil, |