The NATIONAL 3.312x4.376x0.625 Type 45 NBR Oil Seal is engineered for heavy-duty rotating machinery requiring maximum durability and dependable sealing performance. It is widely installed in industrial gearboxes, heavy-duty pumps, mining machinery, electric motors, conveyors, agricultural equipment, construction machinery, and OEM rotating systems.

The Type 45 Profile is a proven heavy-duty metal case rotary shaft oil seal featuring a reinforced steel outer case and a precision spring-loaded primary sealing lip. This construction provides excellent dimensional stability, secure housing retention, and reliable sealing performance during continuous industrial operation.

The integrated garter spring maintains constant radial pressure against the rotating shaft, minimizing lubricant leakage while protecting bearings, shafts, and internal rotating components from premature wear. The reinforced steel case provides excellent resistance against vibration, shock loading, and harsh industrial environments.

Manufactured from premium NBR (Nitrile Butadiene Rubber), this oil seal provides excellent resistance to:

• Mineral oils
• Hydraulic oils
• Gear oils
• Lubricating grease
• Petroleum-based lubricants

NBR offers excellent abrasion resistance, flexibility, and durability, making it ideal for industrial rotating equipment. Typical operating capability is up to 0.5 Bar, with operating temperatures ranging from -40°C to +100°C, depending on shaft speed, lubricant compatibility, and operating conditions.

With dimensions of 3.312 × 4.376 × 0.625 inch, this oil seal is commonly installed in industrial gearboxes, heavy-duty pumps, electric motors, mining equipment, agricultural machinery, conveyor systems, construction machinery, and OEM equipment utilizing inch-size shaft systems.

⚙️ Applications

• Industrial gearboxes
• Heavy-duty pumps
• Electric motors
• Mining equipment
• Agricultural machinery
• Construction machinery
• Conveyor systems
• Power transmission equipment
• Heavy industrial machinery
• OEM machinery

🎯 Benefits

✔ Heavy-duty industrial construction

✔ Excellent oil retention

✔ Outstanding wear resistance

✔ Protects bearings and shafts

✔ Reliable sealing performance

✔ Excellent dimensional stability

✔ Long service life

✔ OEM quality replacement

✔ Reduces maintenance costs

🧠 Technical Insight

• Type 45 Heavy Duty Design
• Reinforced Steel Case
• Spring Loaded Main Lip
• Premium NBR Material
• Excellent Oil Resistance
• Oil & Grease Compatible
• Designed for Continuous Industrial Operation
• Heavy Duty Rotary Shaft Sealing

✅ Key Features

• NATIONAL Industrial Quality
• Type 45 Heavy Duty Profile
• Reinforced Steel Case
• Premium NBR Material
• Spring Loaded Main Lip
• Excellent Wear Resistance
• OEM Replacement Ready
• Long Service Life

📊 Specifications

Brand: NATIONAL

Model: Type 45

Size: 3.312 × 4.376 × 0.625 inch

Type: Heavy Duty Rotary Shaft Oil Seal

Material: NBR (Nitrile Butadiene Rubber)

Profile: Type 45

Construction: Reinforced Metal Case

Lip Design: Spring Loaded Main Lip

Dust Lip: None

Spring Type: Garter Spring

Shaft Diameter (ID): 3.312 inch

Housing Diameter (OD): 4.376 inch

Width: 0.625 inch

Pressure Capability: Up to 0.5 Bar

Lubrication: Oil & Grease

Temperature Range: -40°C to +100°C

Application Class: Heavy Industrial Service

Standard: Inch Size Oil Seal

🔁 Equivalent

Suitable replacement for:

• SKF Heavy Duty Oil Seal
• CR Chicago Rawhide Model 45 Oil Seal
• Freudenberg Oil Seal
• NOK Oil Seal
• CFW Rotary Shaft Seal
• KACO Oil Seal
• DICHTOMATIK Oil Seal
• Garlock Oil Seal
• Simrit Oil Seal
• OEM Heavy Duty Oil Seal

(Always verify dimensions and seal profile before ordering.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for industrial maintenance, gearbox overhaul, mining equipment service, pump repair, electric motor maintenance, and OEM replacement applications.

📲 Contact via LINE ID: dusitrea

📧 Email: sales@seal4go.com

💬 Technical support available before ordering

🔍 Assistance available for cross-reference and equivalent part identification