TC Oil Seal FKM Double Lip Rotary Shaft Seal — ID 72–100mm, Multiple Sizes

Measure three dimensions on your application: (1) the shaft outer diameter — this becomes the seal's ID; (2) the housing bore inner diameter — this becomes the seal's OD; (3) the housing depth — this becomes the seal's thickness. Match all three to the variant listed. For example, an 80mm shaft in a 100mm bore with a 10mm housing depth requires an 80 × 100 × 10mm seal. A mismatch of even 1mm in any dimension will prevent proper seating and cause leakage.

TC designates a double-lip seal. The primary lip retains lubricant and excludes contaminants; the secondary dust lip provides an additional barrier against dirt, debris, and moisture. SC (single lip) seals have only the primary lip and are generally used in cleaner environments. TC seals are typically preferred for automotive, agricultural, and industrial applications where external contamination is a concern.

FKM (fluoroelastomer, often called Viton) handles continuous temperatures typically up to 200°C (392°F) and resists synthetic oils, hydraulic fluids, and aggressive chemicals that cause standard NBR (nitrile) rubber to swell, harden, or crack prematurely. If your application runs hot, uses synthetic lubricants, or involves chemical exposure, FKM is generally the more durable choice. NBR is adequate for lower-temperature, mineral-oil-only applications.

Yes. The FKM lip material resists moisture, and the double-lip TC design helps exclude water, mud, and dust from the bearing cavity. These seals are generally suitable for outdoor machinery, agricultural equipment, and construction machinery. For fully submerged or high-pressure water-jet environments, verify the specific pressure rating with your equipment manufacturer before installation.

FKM seals are generally compatible with most synthetic gear oils, ATF, mineral-based lubricants, and hydraulic oils. They are not recommended for use with ketones (e.g., MEK, acetone), certain esters, or glycol-based brake fluids. If your application uses a specialty fluid, consult a chemical compatibility chart or contact us before ordering.

Divide the millimeter value by 25.4 to get inches. Quick examples from this product range:

• 80mm ID ÷ 25.4 ≈ 3.15″
• 100mm OD ÷ 25.4 ≈ 3.94″
• 10mm thickness ÷ 25.4 ≈ 0.39″
• 12mm thickness ÷ 25.4 ≈ 0.47″

Use these converted values when cross-referencing with inch-standard parts catalogs or OEM part numbers.

For best results, the shaft surface in the sealing zone should typically have a finish of Ra 0.2–0.8 µm (approximately 8–32 µin). Rough or scored shafts accelerate lip wear and cause premature leakage. A hardened shaft surface (typically 55–65 HRC) is recommended in high-speed or abrasive applications. If the shaft is worn or grooved at the seal contact area, a speedi-sleeve repair sleeve can restore the sealing surface without replacing the shaft.

FKM TC oil seals are typically rated for shaft surface speeds up to approximately 4–8 m/s (depending on shaft diameter and lubrication conditions) and continuous operating temperatures from -20°C to +200°C (-4°F to +392°F). Peak intermittent temperatures may be tolerated at higher levels. If your application operates near these limits, contact us with your specific conditions before ordering.