TC / FB Skeleton NBR Oil Seal — Reliable Rotary Shaft Sealing from 125mm to 400mm ID
When a leaking shaft seal causes oil contamination, equipment downtime, or costly bearing failures, finding an exact-fit replacement fast is critical. Whether you're a maintenance technician servicing industrial gearboxes, a shop owner rebuilding agricultural machinery, or a DIYer tackling a hydraulic pump repair, these TC/FB skeleton oil seals give you a direct metric replacement without the wait.
Each seal follows the TC (double-lip, skeleton-type) construction: a stamped steel case insert provides dimensional stability in the bore, a primary NBR nitrile rubber lip retains oil or grease on the shaft, and a secondary dust lip blocks dirt and moisture ingress. Available in 89+ size combinations with Inner Diameter (I.D.) ranging from 125mm (≈4.92″) to 400mm (≈15.75″), Outer Diameter (O.D.) from 150mm to 440mm, and heights of 12mm (≈0.47″), 14mm, 15mm, 16mm, 18mm, or 20mm. Order 1, 2, or 3 pieces per size to match your job quantity.
Typical applications include industrial gearbox output shafts, agricultural tractor PTO and axle seals, hydraulic pump and motor shaft seals, conveyor drive shaft sealing, and heavy equipment wheel hub seals — anywhere a metric rotary shaft seal for large-bore machinery is needed.
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Compatibility Note: These seals use metric dimensions (mm). Before ordering, measure your shaft O.D. (= seal I.D.), housing bore I.D. (= seal O.D.), and housing depth (= seal height) with calipers. The variant label format is I.D. × O.D. × Height in mm — for example, 130*160*14mm fits a 130mm shaft in a 160mm bore with 14mm depth.
✅ Key Features of These TC/FB Skeleton NBR Oil Seals
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🔩Double-Lip TC Design — The primary sealing lip retains lubricants under the shaft; the secondary dust lip prevents abrasive particles and moisture from reaching the bearing, extending service life in dirty environments.
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🧲Steel Skeleton Case Insert — An internal stamped-steel reinforcement ring maintains the seal's round shape during press-fit installation and resists distortion under housing clamping forces, ensuring consistent bore contact.
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🛢️NBR Nitrile Rubber Lip — NBR is broadly compatible with petroleum-based oils, hydraulic fluids, and greases, making these seals suitable for gearbox oil seals, pump shaft seals, and axle seal replacements in most standard industrial fluids.
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📐89+ Metric Size Options — With I.D. from 125mm to 400mm and heights from 12mm to 20mm, this range covers large-bore rotary shaft seal applications across industrial, agricultural, and heavy equipment sectors without custom ordering.
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📦Flexible Quantity Selection — Choose 1, 2, or 3 pieces per size from the variant selector. Multi-piece options reduce per-unit cost for planned maintenance kits or fleet servicing jobs.
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🔄Direct Metric Replacement Fit — Dimensions conform to standard metric seal sizing used in European and Asian machinery, allowing straightforward cross-referencing against OEM part numbers by I.D. × O.D. × height.
📐 Technical Specifications — TC/FB Skeleton Oil Seal
| Seal Type |
TC / FB Double-Lip Skeleton Oil Seal |
| Lip Material |
NBR (Nitrile Butadiene Rubber) |
| Case Construction |
Stamped steel skeleton insert with rubber outer coating |
| Inner Diameter (I.D.) Range |
125mm (≈4.92″) to 400mm (≈15.75″) |
| Outer Diameter (O.D.) Range |
150mm (≈5.91″) to 440mm (≈17.32″) |
| Height (Width) Options |
12mm (≈0.47″), 14mm (≈0.55″), 15mm (≈0.59″), 16mm (≈0.63″), 18mm (≈0.71″), 20mm (≈0.79″) |
| Number of Lips |
2 (primary oil lip + secondary dust lip) |
| Operating Temperature |
Typically −40°F to +250°F (−40°C to +120°C) for NBR |
| Fluid Compatibility |
Petroleum-based oils, hydraulic fluids, greases (standard mineral-based) |
| Pressure Rating |
Generally suitable for low differential pressure (typically ≤0.05 MPa / ≤7 psi); contact us to confirm |
| Dimension Standard |
Metric (mm) |
| Available Quantities |
1 piece, 2 pieces, or 3 pieces per order |
| Country of Origin |
China |
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Size Verification Required: Always confirm all three dimensions (I.D., O.D., and height) before ordering. An incorrect height can prevent proper seating; an incorrect O.D. will not seal the bore. If you are unsure of your dimensions, contact us with your equipment make, model, and shaft location.
❓ Frequently Asked Questions
How do I choose the right TC oil seal size?
Measure three dimensions with calipers: (1) the shaft diameter — this equals the seal's Inner Diameter (I.D.); (2) the housing bore diameter — this equals the seal's Outer Diameter (O.D.); (3) the housing depth — this equals the seal's Height. All three must match. For example, a 130*160*12mm seal fits a 130mm (≈5.12″) shaft in a 160mm (≈6.30″) bore with 12mm (≈0.47″) depth. When in doubt, measure twice and contact us before ordering.
What does TC or FB mean on an oil seal?
TC (also called FB or skeleton type) refers to a double-lip rotary shaft seal with an internal metal case insert. The primary lip retains oil or grease; the secondary dust lip keeps contaminants out. This is the most widely used general-purpose oil seal design in industrial and agricultural machinery worldwide.
What material is the seal lip, and what fluids is it compatible with?
The sealing lip is NBR (Nitrile Butadiene Rubber), which is generally compatible with petroleum-based oils, hydraulic fluids, and greases. NBR typically handles temperatures from approximately −40°F to +250°F (−40°C to +120°C). It is not recommended for use with synthetic esters, ketones, or highly aromatic fuels. Contact us to confirm suitability for your specific fluid.
Can these seals be used outdoors or in wet/dusty environments?
The secondary dust lip provides meaningful protection against dirt, dust, and light moisture ingress, making these seals suitable for agricultural and outdoor industrial equipment in most cases. NBR is generally resistant to water. However, for fully submerged applications or highly corrosive environments, additional housing protection is recommended. The steel skeleton insert may corrode if the housing is not properly sealed against water ingress.
What shaft speed and pressure can these seals handle?
TC-type skeleton oil seals are typically designed for low-to-medium shaft speeds and low differential pressure (generally ≤0.05 MPa / ≤7 psi). They are well-suited for gearbox output shafts, axles, and pump shafts operating at moderate RPM. For high-speed spindle or high-pressure hydraulic applications, contact us to confirm the specific size's suitability.
Are these seals compatible with metric shafts and housings?
Yes. All dimensions follow metric standards in millimeters. These seals are designed to fit metric shafts and bored housings and are commonly used as direct replacements in European and Asian machinery, gearboxes, pumps, and agricultural equipment. Cross-reference by I.D. × O.D. × height against your OEM part number to confirm fit.
How do I install a TC oil seal correctly?
Clean the housing bore and shaft thoroughly. Lightly lubricate the seal lip with the fluid being sealed. Press the seal squarely into the bore using a seal driver or a flat block — never hammer directly on the seal face. Ensure the seal sits flush or slightly below the housing face. Use a lead-in chamfer or installation sleeve on the shaft to avoid nicking the lip on sharp edges or keyways.
Can I order multiple pieces, and is there a quantity discount?
Yes. Each size is available in 1, 2, or 3 pieces. Multi-piece options are priced at a lower per-unit cost compared to single-piece orders. Select your size and quantity from the two variant dropdowns above before adding to cart. For larger quantities beyond 3 pieces, contact us for a custom quote.
🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.
