What load or shaft speed can these seals handle?

NBR TC oil seals in this size range typically handle shaft surface speeds up to approximately 4–6 m/s and operating pressures up to around 0.3 bar. Exact limits depend on the specific OD/height combination and lubrication conditions. Contact us to confirm for your application.

What temperature range do NBR oil seals cover?

NBR compound typically performs in the range of approximately -40°F to +250°F (-40°C to +120°C). For higher-temperature applications such as engine exhaust-side seals, a silicone or FKM material is generally more appropriate.

25mm Bore Metric TC Oil Seal — R23 Double-Lip NBR Rotary Shaft Seal

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25mm Bore Metric TC Oil Seal — R23 Double-Lip NBR Rotary Shaft Seal

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By HomeDIYer®

Size(ID x OD x Height): 25 x 30 x 7mm

Pack Quantity(Pcs): 10

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$8.28 USD

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In stock (500 units), ready to be shipped

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25mm Bore Metric TC Oil Seal — Stop Leaks at the Source with R23 Double-Lip NBR Protection

Mechanics, equipment rebuilders, and DIY enthusiasts know the frustration of a weeping gearbox or a leaking axle seal that contaminates brake components. Finding an exact-fit metric rotary shaft seal — especially in the 25mm bore range — often means hunting through multiple suppliers. These 25mm bore metric TC oil seals follow the R23 standard and are stocked in an extensive range of outer diameters and heights so you can match your housing precisely without compromise.

Each seal features a 25mm (≈1″) inner diameter and is available in outer diameters from 30mm (≈1.18″) up to 80mm (≈3.15″) and heights from 4mm (≈0.16″) to 12mm (≈0.47″). The TC double-lip construction uses NBR (nitrile rubber) for the sealing lips bonded to a steel case. Packs are available in quantities of 1, 2, 5, 10, or 25 pieces to suit single repairs or workshop stock.

Typical applications include automotive gearbox input and output shaft seals, agricultural equipment PTO shaft seals, hydraulic pump shaft seals, and industrial conveyor drive shaft seals — anywhere a metric 25mm bore rotary shaft seal with a double-lip TC arrangement is specified.

🔵 Compatibility: Designed for shafts with a 25mm nominal diameter following the metric R23 TC standard. Select the OD and height to match your housing bore and groove depth. If you are unsure of your housing dimensions, measure with calipers before ordering.

⚠️ Sizing note: All three dimensions — Inner Diameter (ID), Outer Diameter (OD), and Height — must match your application. Do not rely on ID alone. Use the variant selector above to choose the exact ID × OD × Height combination you need.

✅ Key Features of These 25mm Bore Metric TC Oil Seals

🔩R23 TC Double-Lip Design — The primary sealing lip retains lubricant while the secondary dust lip blocks contaminants, making this metric rotary shaft seal suitable for both oil-retention and dirt-exclusion duties.
🧲Steel-Reinforced Case — A rigid steel outer shell ensures the seal presses firmly into the housing bore and maintains its round shape under operating loads, reducing the risk of bypass leakage around the OD.
🌡️NBR Nitrile Rubber Compound — NBR offers broad compatibility with mineral gear oils, ATF, hydraulic fluids, and water, covering a typical service range of approximately -40°F to +250°F (-40°C to +120°C).
📐Extensive Size Matrix — With ODs from 30mm to 80mm and heights from 4mm to 12mm, this listing covers a wide range of metric 25mm bore shaft seal applications in a single place, reducing sourcing time.
📦Flexible Pack Quantities — Order as few as 1 piece for a one-off repair or up to 25 pieces for workshop stock, with per-unit cost decreasing at higher quantities.
🔄Drop-In Replacement Geometry — Manufactured to metric R23 dimensional standards, these seals are generally interchangeable with OEM and aftermarket seals of the same ID × OD × Height specification across automotive, agricultural, and industrial equipment.

📐 Technical Specifications — 25mm Bore Metric TC Rotary Shaft Oil Seal

Inner Diameter (ID)	25mm (≈1″) — nominal shaft size
Outer Diameter (OD)	30mm – 80mm (≈1.18″ – 3.15″) — see variant options
Height (Width)	4mm – 12mm (≈0.16″ – 0.47″) — see variant options
Lip Type	TC — Double lip (primary sealing lip + secondary dust lip)
Standard	Metric R23
Seal Material	NBR (Nitrile Butadiene Rubber)
Case Material	Steel (carbon steel outer shell)
Spring	Garter spring on primary lip (typical for TC type)
Operating Temperature	Typically -40°F to +250°F (-40°C to +120°C)
Fluid Compatibility	Mineral oils, gear oils, ATF, hydraulic fluids, water — contact us to confirm synthetic fluid compatibility
Max Shaft Speed	Typically up to 4–6 m/s surface speed (application-dependent)
Pack Quantity	1 / 2 / 5 / 10 / 25 pieces — see variant options
Country of Origin	Contact us to confirm

❓ Frequently Asked Questions

How do I choose the right TC oil seal size for my application?

Measure three dimensions: the shaft diameter (ID = 25mm for all variants in this listing), the bore diameter in the housing (OD), and the depth of the seal groove (Height). All three must match. For example, a 25 × 42 × 7mm seal fits a 25mm shaft, a 42mm housing bore, and a 7mm deep groove — that's 25mm (≈1″) × 42mm (≈1.65″) × 7mm (≈0.28″). Always verify with calipers before ordering.

What does the R23 TC lip arrangement mean?

R23 is a metric standard designation for a radial shaft seal. TC indicates a double-lip configuration: the primary lip (spring-loaded) retains lubricant inside the housing, while the secondary lip acts as a dust excluder to keep contaminants out. This makes TC seals generally more suitable than single-lip (SC) seals in environments with dirt, dust, or moisture exposure.

What shaft speed and pressure can these seals handle?

NBR TC oil seals in this size range typically handle shaft surface speeds up to approximately 4–6 m/s and low-pressure applications up to around 0.3 bar. Exact limits depend on the specific OD/height combination, lubrication conditions, and shaft surface finish. Contact us to confirm suitability for your specific operating conditions.

Are these seals suitable for outdoor or wet environments?

NBR generally offers good resistance to water, mineral oils, and mild weather exposure. The TC double-lip design adds an extra layer of moisture and dust exclusion. For prolonged UV exposure or ozone-rich environments, FKM (Viton) seals are typically recommended. In most outdoor agricultural and automotive applications, NBR TC seals perform well.

Are these compatible with synthetic gear oils or ATF?

NBR is generally compatible with mineral-based gear oils, conventional ATF, and most hydraulic fluids. Compatibility with full-synthetic PAO or ester-based oils varies by formulation — in most cases NBR performs adequately at moderate temperatures, but for aggressive synthetic fluids or high-temperature applications, verify compatibility or consider FKM seals. Contact us to confirm for your specific fluid.

How do I install a TC oil seal without damaging the lip?

Lightly lubricate the seal lip and shaft with clean oil before installation. Use a seal driver or a flat wooden block to press the seal in squarely — never hammer directly on the seal face or lip. Ensure the housing bore is clean, smooth, and free of burrs. The seal should sit flush or just slightly below the housing face. Chamfer or tape any shaft keyways or splines to protect the lip during installation.

How do I know if I need a TC (double-lip) or SC (single-lip) seal?

Use a TC double-lip seal when the application involves exposure to external contaminants such as dirt, dust, water, or road debris — for example, axle seals, gearbox output seals, and agricultural PTO seals. A single-lip SC seal is typically used in cleaner environments where the primary concern is lubricant retention rather than contamination exclusion. When in doubt, TC is generally the more conservative and protective choice.

🛒 Select your size (ID × OD × Height) and pack quantity above, then add to cart — ships from our US warehouse.

25mm Bore Metric TC Oil Seal — R23 Double-Lip NBR Rotary Shaft Seal

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25mm Bore Metric TC Oil Seal — Stop Leaks at the Source with R23 Double-Lip NBR Protection

✅ Key Features of These 25mm Bore Metric TC Oil Seals

📐 Technical Specifications — 25mm Bore Metric TC Rotary Shaft Oil Seal

❓ Frequently Asked Questions

25mm Bore Metric TC Oil Seal — R23 Double-Lip NBR Rotary Shaft Seal

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