TC TG Oil Seal Skeleton FKM Rubber Framework Double Lip Oil Sealing Ring 7-18mm

You need three measurements: the shaft outer diameter (= seal inner diameter), the housing bore inner diameter (= seal outer diameter), and the housing depth or groove width (= seal depth). Measure with calipers rather than relying on worn seal dimensions, as a damaged seal may have stretched. Match all three values to the variant option listed as Inner Ø × Outer Ø × Depth.

Both TC and TG designations describe double-lip skeleton oil seals with a primary sealing lip and a secondary exclusion lip. The difference lies in the secondary lip geometry and spring configuration used by different standards bodies. In practice, TC and TG seals are dimensionally interchangeable for most metric applications. If your equipment manual specifies one type, either will typically fit the same housing.

FKM (fluoroelastomer) offers significantly better resistance to high temperatures (up to ~200 °C vs. ~120 °C for standard NBR), petroleum-based fluids, transmission fluids, and mild fuels. If your application runs hot — such as a turbo engine, high-cycle hydraulic pump, or equipment exposed to elevated ambient temperatures — FKM seals maintain lip flexibility and sealing force longer than NBR alternatives.

These TC/TG skeleton seals are designed for rotating shaft applications, not reciprocating (linear) hydraulic rod seals. For a rotating hydraulic pump shaft, they are appropriate. For a hydraulic cylinder rod or piston, you would need a different seal profile (e.g., U-cup or lip seal rated for reciprocating motion). Contact us to confirm suitability if you are unsure of your application type.

Clean the housing bore and lightly lubricate the outer diameter of the seal with clean oil or grease before pressing in. Use a flat press tool or a socket slightly smaller than the outer diameter to apply even pressure — never hammer directly on the seal face. Press until the seal face is flush with or just below the housing surface. Lightly coat the sealing lip with the fluid it will be retaining before fitting over the shaft to prevent dry-start damage.

Compatibility is determined by dimensions, not by vehicle make or model. Measure your shaft OD, housing bore ID, and housing depth, then match those to the variant options. If your OEM seal carries a part number, cross-reference its published dimensions against the size matrix here. If you need help confirming a match, contact us with your measurements or OEM part number.

While FKM has broad chemical resistance, it is generally not recommended for use with ketones (e.g., MEK, acetone), certain esters, or low-molecular-weight organic acids at elevated concentrations. For standard engine oil, gear oil, ATF, and petroleum-based hydraulic fluid, FKM performs well. If your application involves unusual process fluids or aggressive solvents, contact us to confirm compatibility before ordering.