How to find the right Radial Shaft Seals AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Radial Shaft Seals
- Size code
- Specify shaft diameter by housing bore by width. These are read from the old seal or measured, never estimated. Bore interference and lip interference on the shaft are what create the seal.
- Lip and case design
- Choose a rubber-covered outer diameter for soft or imperfect bores and a metal case for press fits in steel. Choose a dual-lip design where dust or water is present. The design has to match the housing condition and the contamination it faces.
- Material versus speed and temperature
- NBR suits general oil service at moderate temperature. FKM suits high temperature and high shaft speed. PTFE suits very high speed, dry running or chemical service. Lip heat from speed and temperature hardens and cracks NBR.
- Shaft condition
- The shaft needs a smooth, plunge-ground finish with no machining lead. If the old lip wore a groove, use a repair sleeve or move the seal off the groove. Machining lead pumps oil past the lip, and a grooved shaft leaks even with a new seal.
- Orientation
- The spring side and main lip face the lubricant being retained. A reversed seal leaks from day one.
Brands that matter
- SKF: CR-lineage oil seals plus Speedi-Sleeve shaft repair sleeves.
- National: Widely cross-referenced automotive and industrial oil seals.
- Timken: Bearing-maker oil seals with broad size coverage.
- Freudenberg: OEM-grade radial shaft seals.
- TCM: Large inventory of metric and inch sizes.
What to avoid
- Installing the seal with a hammer directly on the seal. Use a driver that presses on the outer edge.
- Ignoring a worn groove on the shaft.
Questions
What do letter codes like TC or SC mean?
They are common profile designations used by many makers. TC usually means a rubber-covered outer diameter with a main lip plus a dust lip, and SC means a single lip. Confirm with the seller's drawing because usage varies.