TC Skeleton Oil Seal Rings FKM Rotary Shaft Double Lip Height 7mm-ID 8~60mm

Measure three dimensions on your existing seal or housing: Inner Diameter (ID) — the shaft diameter the seal lip contacts; Outer Diameter (OD) — the bore diameter the seal presses into; and Height (depth) — which is 7mm for all seals in this listing. Match all three to the variant size listed as ID × OD × Height. If your existing seal is worn, measure the shaft OD directly and the housing bore ID for the most accurate fit.

NBR (nitrile) seals are adequate for standard petroleum oils at moderate temperatures (typically up to ~100°C). FKM (Viton-type) seals are the correct choice when operating temperatures exceed 120°C, when synthetic or ester-based lubricants are used, or when the seal is exposed to aggressive chemicals. FKM also offers better resistance to ozone and weathering, making it suitable for outdoor or high-heat machinery.

A single-lip (SC) seal has one sealing lip that retains lubricant. The TC profile adds a second, shorter dust-exclusion lip on the air side of the seal. This secondary lip prevents abrasive particles, water, and contaminants from reaching the primary sealing lip, extending seal life in dirty or wet environments such as agricultural equipment, off-road machinery, and outdoor power tools.

FKM is broadly compatible with petroleum-based mineral oils, synthetic PAO and PAG lubricants, hydraulic fluids (including HLP and HVLP types), silicone fluids, and many fuels. It is generally not recommended for use with ketones (MEK, acetone), certain esters at high concentrations, or anhydrous hydrofluoric acid. Always verify compatibility with your specific fluid and operating conditions before installation, particularly for specialty or proprietary lubricants.

TC skeleton oil seals are press-fit into the housing bore. The OD of the seal should be slightly larger than the bore to create an interference fit. Use a seal driver or a flat-faced press tool sized to the OD of the seal to press it in squarely — never strike the seal face directly. Lightly lubricate the seal lip with the operating fluid before installation to prevent lip damage on initial startup. Ensure the shaft surface is smooth and free of burrs or scoring.

These are designed as dynamic rotary shaft seals — the primary lip is engineered to maintain contact with a rotating shaft. They are not intended for purely static face-seal applications. For best results, the shaft surface hardness should be HRC 30 or higher with a surface finish of Ra 0.2–0.8 µm in the contact zone. Shaft speeds and pressures beyond the seal's rated range will reduce service life; contact us to confirm suitability for high-speed or high-pressure applications.

Both options are the same seal — the difference is pack quantity. The 1 PCS option is suited for a single replacement or repair job. The 5 PCS option provides workshop stock for recurring maintenance, fleet servicing, or situations where you want spares on hand. Pricing per unit is lower in the 5 PCS pack. Select your preferred quantity in the Packing QTY variant selector above.