TC Skeleton Oil Seals ID 90/95/100mm — FKM Dual Lip Rotary Shaft Seal Ring

Measure three dimensions: the shaft diameter (this is your ID), the bore diameter in the housing (this is your OD), and the housing depth (this is your thickness). For example, a 100mm shaft in a 130mm bore with 12mm depth = select 100*130*12mm. All three must match your application exactly. If converting from inches, 1 inch = 25.4mm — so a 4" shaft is approximately 101.6mm; in that case, confirm whether your equipment uses a metric or inch-standard seal before ordering.

TC-type rotary shaft seals are generally designed for low-pressure dynamic sealing, typically up to 0.05 MPa (approximately 7 psi) of differential pressure. They are not intended for high-pressure hydraulic circuits. For higher-pressure applications, a dedicated hydraulic lip seal or mechanical face seal is recommended.

FKM (Viton) rubber offers excellent resistance to petroleum oils, synthetic lubricants, fuels, and many industrial chemicals, and performs reliably across a wide temperature range (typically -20°C to +200°C / -4°F to +392°F). This makes these seals well-suited for outdoor machinery, agricultural equipment, and moderately corrosive environments. For highly aggressive chemicals such as ketones or strong acids, confirm fluid compatibility before installation.

These TC skeleton oil seals follow metric dimensional standards (ISO 6194 / DIN 3760). They are designed for metric shafts and cylindrical housings. If your equipment uses inch-based shafts, verify the metric equivalent before ordering. The seals require a smooth, ground shaft surface and a clean, round bore for proper seating.

A single lip seal has one sealing edge that retains lubricant on the inboard side. A TC dual lip seal adds a second, outward-facing dust lip that prevents contaminants — dirt, water, and debris — from reaching the primary sealing lip. TC seals are generally preferred for applications exposed to external contamination, such as agricultural, construction, and outdoor industrial equipment.

For reliable sealing, the shaft surface in the lip contact zone should generally be ground to a finish of Ra 0.2–0.8 µm (8–32 µin). Rough, scored, or corroded shafts will accelerate lip wear and cause premature leakage. A light film of clean oil applied to the sealing lip is recommended during installation to prevent dry-start damage.

FKM rubber is generally compatible with synthetic motor oils, automatic transmission fluid (ATF), gear oils, and most petroleum-based hydraulic fluids. It is not recommended for use with ketones (MEK, acetone), esters, or certain brake fluids. When in doubt, consult a fluid compatibility chart or contact us to confirm suitability for your specific fluid.