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When a worn or mismatched oil seal lets lubricant escape and contaminants in, the downstream damage to bearings, gearboxes, and rotating shafts can be costly. These Metric TC Rotary Oil Shaft Seals are engineered for mechanics, maintenance technicians, and DIY builders who need a dependable, drop-in replacement or upgrade for standard metric shaft applications ranging from 16mm to 21mm inner diameter.
Each seal is constructed from FKM (fluoroelastomer / fluorine rubber), a material known for its resistance to oils, fuels, and elevated operating temperatures. The TC double-lip design features a primary sealing lip that retains lubricant and a secondary dust lip that blocks contaminants. Inner diameters span 16–21mm (0.63–0.83 in), outer diameters range from 22–60mm (0.87–2.36 in), and seal depths run from 4–12mm (0.16–0.47 in) depending on the variant selected.
Typical applications include automotive gearbox and differential shaft sealing, industrial motor and pump shaft replacement, and light machinery or CNC spindle maintenance where FKM chemical resistance is required over standard NBR seals. Each listing is sold in a pack of 5 pieces, making them suitable for workshop stock or multi-unit repair jobs.
| Seal Type | TC (Double Lip Rotary Oil Seal) |
|---|---|
| Material | FKM (Fluoroelastomer / Fluorine Rubber) |
| Lip Configuration | Double lip — primary sealing lip + secondary dust lip |
| Inner Diameter (Shaft OD) | 16mm – 21mm (0.63 in – 0.83 in) — See variant options |
| Outer Diameter | 22mm – 60mm (0.87 in – 2.36 in) — See variant options |
| Seal Depth / Width | 4mm – 12mm (0.16 in – 0.47 in) — See variant options |
| Operating Temperature | Typically –40°C to +200°C (–40°F to +392°F) for FKM |
| Chemical Resistance | Petroleum oils, synthetic lubricants, fuels, mild acids |
| Spring | See variant options |
| Packing Quantity | 5 pieces per pack |
| Standard | Metric (mm dimensions) |
You need three measurements: the shaft outer diameter (which becomes the seal inner diameter), the housing bore diameter (which becomes the seal outer diameter), and the housing depth (which determines the seal width). Match all three to the variant dimensions listed as Inner Ø × Outer Ø × Depth in millimeters. If your shaft is between 16mm and 21mm OD, this product family covers your range.
A TC seal has two sealing lips — a primary lip that retains lubricant and a secondary dust lip that prevents contaminants from entering. An SC seal has only a single lip. TC seals are preferred in environments where both oil retention and dust/moisture exclusion are important, making them the more common choice for automotive and general industrial applications.
FKM (fluoroelastomer) offers significantly better resistance to high temperatures, synthetic lubricants, fuels, and aggressive chemicals compared to standard NBR (nitrile rubber). If your application involves elevated operating temperatures above 120°C, synthetic gear oils, or exposure to fuels, FKM is the recommended material. NBR is adequate for standard mineral oil applications at moderate temperatures.
Yes. TC rotary oil seals in FKM are commonly used in automotive gearbox input/output shafts and differential pinion shafts where metric dimensions apply. Confirm that the shaft OD, housing bore, and seal depth match your vehicle's specifications before ordering. Consult your vehicle's service manual for the exact seal dimensions required.
TC oil seals are installed using a press-fit method. Clean the housing bore and shaft, lightly lubricate the seal lip with the fluid it will be sealing, then press the seal squarely into the housing bore using a seal driver or a flat press until it is flush or slightly below the housing face. Avoid hammering directly on the seal face, as this can distort the lip and cause premature leakage.
FKM material itself is highly resistant to chemical attack and moisture. The secondary dust lip on the TC design provides an additional barrier against water and particulate ingress. However, these are rotary shaft seals designed for dynamic sealing applications — they are not rated as static waterproof seals. For submerged or high-pressure water environments, verify the specific pressure rating required.
Oil seals are consumable maintenance items that are typically replaced in sets or stocked for future service intervals. Selling in packs of 5 allows mechanics and workshop operators to keep spares on hand, reducing downtime when a seal fails unexpectedly. For single-unit repairs, the remaining seals can be stored for future use as they have a long shelf life when kept in a cool, dry location away from UV light and ozone sources.
