What thread or shaft standards are compatible?

These are metric TC-type oil seals with a 30mm inner diameter. They are compatible with metric shafts following ISO 6194 / DIN 3760 standards. Always verify the shaft diameter and housing bore match the seal dimensions listed in the variant options.

What is the difference between single lip and double lip (TC) oil seals?

A single lip seal (SC type) retains lubricant on one side. A double lip TC seal adds a secondary dust lip that faces outward, blocking contaminants like dirt and moisture from entering the bearing or gearbox. TC seals are generally preferred in environments where external contamination is a concern.

Can I use these seals in a gearbox or motor?

Yes. TC-type NBR oil seals are commonly used in automotive gearboxes, electric motors, agricultural equipment, and industrial pumps. Confirm the operating temperature range (typically –40°F to +250°F / –40°C to +120°C for NBR) and fluid compatibility before installation.

TC Oil Seal 30mm ID — Double Lip NBR 70 Nitrile Rotary Shaft Seal (FB Skeleton)

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TC Oil Seal 30mm ID — Double Lip NBR 70 Nitrile Rotary Shaft Seal (FB Skeleton)

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Size(ID x OD x Height): 30*40*7mm

Amout(pcs): 1 Pcs

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$3.73 USD

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TC Double Lip NBR Oil Seal for 30mm Shafts — Stop Leaks at the Source

Mechanics, equipment rebuilders, and DIY enthusiasts know the frustration of a weeping shaft seal: oil stains on the floor, contaminated bearings, and a repair job that keeps coming back. Whether you're rebuilding a gearbox, servicing an agricultural machine, or replacing a worn motor seal, getting the right rotary shaft seal the first time saves hours of rework.

Each seal in this listing is a TC-type double lip skeleton oil seal made from NBR 70 (nitrile rubber) with a rigid metal outer case (FB skeleton). The inner diameter is fixed at 30mm (≈1.18"); outer diameter ranges from 40mm to 72mm (≈1.57" to 2.83") and heights from 7mm to 12mm (≈0.28" to 0.47") — select your exact ID × OD × Height combination from the variant options. Available in packs of 1, 2, 5, 10, or 20 pieces.

Typical applications include automotive differential and transmission output shafts, electric motor end shields, hydraulic pump input shafts, agricultural PTO shafts, and industrial gearbox housings — anywhere a metric rotary shaft seal with dual-lip contamination protection is required.

ℹ️ Compatibility check: Confirm your shaft ID = 30mm, then match the OD to your housing bore and the height to your housing depth. Dimensions follow metric ISO 6194 / DIN 3760 standards.

✅ Key Features of These TC Double Lip NBR Rotary Shaft Seals

🔒Double Lip (TC) Design — The primary lip retains lubricant while the secondary dust lip blocks dirt, grit, and moisture, making these seals ideal for double lip oil seal gearbox and motor applications.
🧱FB Metal Skeleton Construction — A rigid steel outer case maintains roundness during press-fit installation and resists distortion under housing clamping forces, ensuring a leak-free bore seal.
🛢️NBR 70 Nitrile Rubber Compound — Resistant to petroleum-based oils, ATF, gear oil, and water; rated for continuous use across a wide temperature range, making it a reliable nitrile rotary shaft seal for most industrial fluids.
📐Wide Size Selection — OD from 40mm to 72mm and heights from 7mm to 12mm cover a broad range of metric housings, reducing the need to source seals from multiple suppliers.
📦Flexible Pack Quantities — Order 1, 2, 5, 10, or 20 pieces per SKU — whether you need a single replacement or a shop stock of NBR oil seals for bulk repair jobs.
⚙️Drop-In Metric Replacement — Dimensioned to ISO 6194 / DIN 3760 metric standards, these seals replace OEM parts in automotive, agricultural, and industrial equipment without modification.

📐 Technical Specifications — TC Double Lip NBR 70 Oil Seal

Seal Type	TC (Double Lip, Skeleton)
Inner Diameter (ID)	30mm (≈1.18")
Outer Diameter (OD)	40mm – 72mm (≈1.57" – 2.83") — see variant options
Height / Width	7mm – 12mm (≈0.28" – 0.47") — see variant options
Material	NBR 70 (Nitrile Butadiene Rubber)
Outer Case	FB Metal Skeleton (carbon steel)
Lip Configuration	Primary sealing lip + secondary dust exclusion lip
Operating Temperature	Typically –40°F to +250°F (–40°C to +120°C)
Compatible Fluids	Petroleum oils, ATF, gear oil, water (not for ketones or strong acids)
Dimensional Standard	ISO 6194 / DIN 3760 (metric)
Pack Quantity	1, 2, 5, 10, or 20 pcs — see variant options
Spring	See variant options / Contact us to confirm
Surface Finish Requirement	Shaft surface Ra typically ≤ 0.8 µm recommended

⚠️ Before ordering: Measure your existing seal or housing bore carefully. The OD must match your housing bore and the height must fit your housing depth. When replacing a worn seal, the shaft surface should be free of grooves or scoring for best results.

❓ Frequently Asked Questions

How do I choose the right oil seal size?

Measure three dimensions: shaft inner diameter (ID), housing bore outer diameter (OD), and housing depth (height). All three must match. For example, a 30*50*10mm seal fits a 30mm shaft, a 50mm (≈1.97") bore, and a 10mm (≈0.39") deep housing. When replacing an existing seal, read the size stamped on its face or measure the old seal directly.

What load or pressure can these oil seals handle?

TC-type rotary shaft seals are generally designed for low-to-medium pressure applications. They are typically rated for shaft speeds up to around 4–8 m/s and static pressures up to approximately 0.05 MPa. For high-pressure hydraulic circuits, a different seal type (such as a hydraulic rod seal) is generally recommended.

Are these seals suitable for outdoor or wet environments?

NBR (nitrile rubber) offers good resistance to petroleum-based oils, water, and mild weather exposure. For prolonged UV exposure or contact with ozone, FKM (Viton) seals are generally a better choice. These NBR 70 seals are well-suited for most indoor mechanical and light outdoor applications such as agricultural equipment and utility motors.

What shaft or bore standards are compatible with these seals?

These are metric TC-type oil seals dimensioned to ISO 6194 / DIN 3760 standards with a 30mm inner diameter. They are compatible with metric shafts and housings following those standards. Always verify the shaft diameter and housing bore match the exact variant dimensions before ordering.

What is the difference between a single lip and a double lip (TC) oil seal?

A single lip seal (SC type) retains lubricant on one side only. A double lip TC seal adds a secondary dust exclusion lip that faces outward, blocking contaminants like dirt, grit, and moisture from entering the bearing or gearbox. TC seals are generally preferred in environments where external contamination is a concern — such as agricultural, automotive, and outdoor industrial equipment.

Can I use these seals in a gearbox, motor, or pump?

Yes. TC-type NBR oil seals are commonly used in automotive gearboxes, electric motor end shields, agricultural PTO shafts, hydraulic pump input shafts, and industrial gearbox housings. Confirm the operating temperature range (typically –40°F to +250°F / –40°C to +120°C for NBR) and fluid compatibility before installation.

How do I install a rotary shaft oil seal correctly?

Clean the housing bore and shaft thoroughly. Lightly lubricate the seal lip with the fluid it will retain. Press the seal in squarely using a seal driver or a flat block — never hammer directly on the seal face. Ensure the primary lip faces the lubricant side (inward) and the dust lip faces outward. Check that the seal sits flush or slightly below the housing face.

How do I convert the seal dimensions from mm to inches?

Divide millimeters by 25.4 to get inches. Quick reference: 30mm ≈ 1.18", 40mm ≈ 1.57", 50mm ≈ 1.97", 55mm ≈ 2.17", 62mm ≈ 2.44", 72mm ≈ 2.83". Heights: 7mm ≈ 0.28", 10mm ≈ 0.39", 12mm ≈ 0.47".

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

TC Oil Seal 30mm ID — Double Lip NBR 70 Nitrile Rotary Shaft Seal (FB Skeleton)

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Description

TC Double Lip NBR Oil Seal for 30mm Shafts — Stop Leaks at the Source

✅ Key Features of These TC Double Lip NBR Rotary Shaft Seals

📐 Technical Specifications — TC Double Lip NBR 70 Oil Seal

❓ Frequently Asked Questions

TC Oil Seal 30mm ID — Double Lip NBR 70 Nitrile Rotary Shaft Seal (FB Skeleton)

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